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Cash Equivalents, Restricted Cash and Restricted Cash Equivalents","description":"Amount of cash and cash equivalents, and cash and cash equivalents restricted to withdrawal or usage. Excludes amount for disposal group and discontinued operations. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.","units":{"USD":[{"end":"2016-12-31","val":580000000,"accn":"0000912750-18-000011","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-01"},{"end":"2016-12-31","val":580000000,"accn":"0000912750-18-000021","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-07-31"},{"end":"2016-12-31","val":580000000,"accn":"0000912750-18-000027","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-10-31","frame":"CY2016Q4I"},{"end":"2017-03-31","val":497000000,"accn":"0000912750-18-000011","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-01","frame":"CY2017Q1I"},{"end":"2017-06-30","val":554000000,"accn":"0000912750-18-000021","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-07-31","frame":"CY2017Q2I"},{"end":"2017-09-30","val":464000000,"accn":"0000912750-18-000027","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-10-31","frame":"CY2017Q3I"},{"end":"2017-12-31","val":366000000,"accn":"0000912750-18-000011","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-01"},{"end":"2017-12-31","val":366000000,"accn":"0000912750-18-000021","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-07-31"},{"end":"2017-12-31","val":366000000,"accn":"0000912750-18-000027","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-10-31","frame":"CY2017Q4I"},{"end":"2018-03-31","val":241000000,"accn":"0000912750-18-000011","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-01","frame":"CY2018Q1I"},{"end":"2018-06-30","val":339000000,"accn":"0000912750-18-000021","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-07-31","frame":"CY2018Q2I"},{"end":"2018-09-30","val":311000000,"accn":"0000912750-18-000027","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-10-31","frame":"CY2018Q3I"}]}},"CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect":{"label":"Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Excluding Exchange Rate Effect","description":"Amount of increase (decrease) in cash and cash equivalents, and cash and cash equivalents restricted to withdrawal or usage; excluding effect from exchange rate change. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.","units":{"USD":[{"start":"2017-01-01","end":"2017-03-31","val":-83000000,"accn":"0000912750-18-000011","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-01","frame":"CY2017Q1"},{"start":"2017-01-01","end":"2017-06-30","val":-26000000,"accn":"0000912750-18-000021","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-07-31"},{"start":"2017-01-01","end":"2017-09-30","val":-116000000,"accn":"0000912750-18-000027","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-10-31"},{"start":"2018-01-01","end":"2018-03-31","val":-125000000,"accn":"0000912750-18-000011","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-01","frame":"CY2018Q1"},{"start":"2018-01-01","end":"2018-06-30","val":-27000000,"accn":"0000912750-18-000021","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-07-31"},{"start":"2018-01-01","end":"2018-09-30","val":-55000000,"accn":"0000912750-18-000027","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-10-31"}]}},"CashPaidForCapitalizedInterest":{"label":"Cash Paid for Capitalized Interest (Deprecated 2011-01-31)","description":"The amount of cash paid during the current period for interest owed on money borrowed that is not charged as an expense but rather is capitalized based on the long term nature of the use of the borrowed funds.","units":{"USD":[{"start":"2008-01-01","end":"2008-12-31","val":60000000,"accn":"0000950123-11-024275","fy":2010,"fp":"FY","form":"10-K/A","filed":"2011-03-11","frame":"CY2008"},{"start":"2009-01-01","end":"2009-12-31","val":51000000,"accn":"0000950123-11-024275","fy":2010,"fp":"FY","form":"10-K/A","filed":"2011-03-11","frame":"CY2009"},{"start":"2010-01-01","end":"2010-12-31","val":58000000,"accn":"0000950123-11-024275","fy":2010,"fp":"FY","form":"10-K/A","filed":"2011-03-11","frame":"CY2010"}]}},"CashProvidedByUsedInFinancingActivitiesDiscontinuedOperations":{"label":"Cash Provided by (Used in) Financing Activities, Discontinued Operations","description":"Amount of cash inflow (outflow) of financing activities of discontinued operations. Financing activity cash flows include obtaining resources from owners and providing them with a return on, and a return of, their investment; borrowing money and repaying amounts borrowed, or settling the obligation; and obtaining and paying for other resources obtained from creditors on long-term credit.","units":{"USD":[{"start":"2007-01-01","end":"2007-12-31","val":38000000,"accn":"0000950123-10-017899","fy":2009,"fp":"FY","form":"10-K","filed":"2010-02-26","frame":"CY2007"},{"start":"2008-01-01","end":"2008-12-31","val":0,"accn":"0000950123-10-017899","fy":2009,"fp":"FY","form":"10-K","filed":"2010-02-26","frame":"CY2008"},{"start":"2009-01-01","end":"2009-12-31","val":0,"accn":"0000950123-10-017899","fy":2009,"fp":"FY","form":"10-K","filed":"2010-02-26","frame":"CY2009"}]}},"CashProvidedByUsedInInvestingActivitiesDiscontinuedOperations":{"label":"Cash Provided by (Used in) Investing Activities, Discontinued Operations","description":"Amount of cash inflow (outflow) of investing activities of discontinued operations. Investing activity cash flows include making and collecting loans and acquiring and disposing of debt or equity instruments and property, plant, and equipment and other productive assets.","units":{"USD":[{"start":"2007-01-01","end":"2007-12-31","val":-41000000,"accn":"0000950123-10-017899","fy":2009,"fp":"FY","form":"10-K","filed":"2010-02-26","frame":"CY2007"},{"start":"2008-01-01","end":"2008-12-31","val":0,"accn":"0000950123-10-017899","fy":2009,"fp":"FY","form":"10-K","filed":"2010-02-26","frame":"CY2008"},{"start":"2009-01-01","end":"2009-12-31","val":0,"accn":"0000950123-10-017899","fy":2009,"fp":"FY","form":"10-K","filed":"2010-02-26","frame":"CY2009"}]}},"CashProvidedByUsedInOperatingActivitiesDiscontinuedOperations":{"label":"Cash Provided by (Used in) Operating Activities, Discontinued Operations","description":"Amount of cash inflow (outflow) of operating activities of discontinued operations. 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:"2013-12-31","val":57000000,"accn":"0000912750-14-000054","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-10-29"},{"end":"2013-12-31","val":57000000,"accn":"0000912750-15-000009","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-24","frame":"CY2013Q4I"},{"end":"2014-03-31","val":35000000,"accn":"0000912750-14-000026","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-04-30","frame":"CY2014Q1I"},{"end":"2014-06-30","val":33000000,"accn":"0000912750-14-000038","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-07-30","frame":"CY2014Q2I"},{"end":"2014-09-30","val":29000000,"accn":"0000912750-14-000054","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-10-29","frame":"CY2014Q3I"},{"end":"2014-12-31","val":57000000,"accn":"0000912750-15-000009","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-24"},{"end":"2014-12-31","val":23000000,"accn":"0000912750-15-000027","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-06"},{"end":"2014-12-31","val":23000000,"accn":"0000912750-15-000042","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-05"},{"end":"2014-12-31","val":23000000,"accn":"0000912750-15-000049","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-04"},{"end":"2014-12-31","val":23000000,"accn":"0000912750-16-000053","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-24","frame":"CY2014Q4I"},{"end":"2015-03-31","val":18000000,"accn":"0000912750-15-000027","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-06","frame":"CY2015Q1I"},{"end":"2015-06-30","val":18000000,"accn":"0000912750-15-000042","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-05","frame":"CY2015Q2I"},{"end":"2015-09-30","val":28000000,"accn":"0000912750-15-000049","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-04","frame":"CY2015Q3I"},{"end":"2015-12-31","val":40000000,"accn":"0000912750-16-000053","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-24"},{"end":"2015-12-31","val":40000000,"accn":"0000912750-16-000060","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-05-03"},{"end":"2015-12-31","val":40000000,"accn":"0000912750-16-000072","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-03"},{"end":"2015-12-31","val":40000000,"accn":"0000912750-16-000075","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-01"},{"end":"2015-12-31","val":40000000,"accn":"0000912750-17-000003","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-21","frame":"CY2015Q4I"},{"end":"2016-03-31","val":41000000,"accn":"0000912750-16-000060","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-05-03","frame":"CY2016Q1I"},{"end":"2016-06-30","val":48000000,"accn":"0000912750-16-000072","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-03","frame":"CY2016Q2I"},{"end":"2016-09-30","val":49000000,"accn":"0000912750-16-000075","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-01","frame":"CY2016Q3I"},{"end":"2016-12-31","val":46000000,"accn":"0000912750-17-000003","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-21"},{"end":"2016-12-31","val":46000000,"accn":"0000912750-17-000007","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-02"},{"end":"2016-12-31","val":46000000,"accn":"0000912750-17-000012","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-01"},{"end":"2016-12-31","val":46000000,"accn":"0000912750-17-000019","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-10-31"},{"end":"2016-12-31","val":46000000,"accn":"0000912750-18-000004","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-20","frame":"CY2016Q4I"},{"end":"2017-03-31","val":51000000,"accn":"0000912750-17-000007","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-02","frame":"CY2017Q1I"},{"end":"2017-06-30","val":60000000,"accn":"0000912750-17-000012","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-01","frame":"CY2017Q2I"},{"end":"2017-09-30","val":103000000,"accn":"0000912750-17-000019","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-10-31","frame":"CY2017Q3I"},{"end":"2017-12-31","val":98000000,"accn":"0000912750-18-000004","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-20"},{"end":"2017-12-31","val":98000000,"accn":"0000912750-18-000011","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-01"},{"end":"2017-12-31","val":98000000,"accn":"0000912750-18-000021","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-07-31"},{"end":"2017-12-31","val":98000000,"accn":"0000912750-18-000027","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-10-31","frame":"CY2017Q4I"},{"end":"2018-03-31","val":88000000,"accn":"0000912750-18-000011","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-01","frame":"CY2018Q1I"},{"end":"2018-06-30","val":89000000,"accn":"0000912750-18-000021","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-07-31","frame":"CY2018Q2I"},{"end":"2018-09-30","val":82000000,"accn":"0000912750-18-000027","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-10-31","frame":"CY2018Q3I"}]}},"OtherAssetsNoncurrent":{"label":"Other 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This item includes treasury stock repurchased by the entity. 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Q2I"},{"end":"2017-09-30","val":108000000,"accn":"0000912750-17-000019","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-10-31","frame":"CY2017Q3I"},{"end":"2017-12-31","val":112000000,"accn":"0000912750-18-000004","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-20"},{"end":"2017-12-31","val":112000000,"accn":"0000912750-18-000011","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-01"},{"end":"2017-12-31","val":112000000,"accn":"0000912750-18-000021","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-07-31"},{"end":"2017-12-31","val":112000000,"accn":"0000912750-18-000027","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-10-31","frame":"CY2017Q4I"},{"end":"2018-03-31","val":110000000,"accn":"0000912750-18-000011","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-01","frame":"CY2018Q1I"},{"end":"2018-06-30","val":115000000,"accn":"0000912750-18-000021","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-07-31","frame":"CY2018Q2I"},{"end":"2018-09-30","val":118000000,"accn":"0000912750-18-000027","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-10-31","frame":"CY2018Q3I"}]}},"PropertyPlantAndEquipmentOtherNet":{"label":"Property, 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Examples include land, buildings, machinery and equipment, and other types of furniture and equipment including, but not limited to, office equipment, furniture and fixtures, and computer equipment and software.","units":{"pure":[{"start":"2010-01-01","end":"2010-12-31","val":7,"accn":"0000950123-11-024275","fy":2010,"fp":"FY","form":"10-K/A","filed":"2011-03-11","frame":"CY2010"}]}},"PropertyPlantAndEquipmentUsefulLifeMinimum":{"label":"Property, Plant and Equipment, Useful Life, Minimum (Deprecated 2012-01-31)","description":"The minimum useful life of long lived, physical assets used in the normal conduct of business and not intended for resale. 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For example, but not limited to, barrel of oil equivalents (BOE) or one thousand cubic feet of natural gas equivalent (Mcfe).","units":{"MMBoe":[{"start":"2012-01-01","end":"2012-12-31","val":86,"accn":"0000912750-15-000009","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-24","frame":"CY2012"},{"start":"2013-01-01","end":"2013-12-31","val":80,"accn":"0000912750-15-000009","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-24","frame":"CY2013"},{"start":"2014-01-01","end":"2014-12-31","val":72,"accn":"0000912750-15-000009","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-24","frame":"CY2014"}]}},"ProvedDevelopedAndUndevelopedReserveNetEnergy":{"label":"Proved Developed and Undeveloped Reserve, Net (Energy)","description":"Energy measure of proved reserve of oil and gas, stated in a unit of energy. For example, but not limited to, barrel of oil equivalents (BOE) or one thousand cubic feet of natural gas equivalent (Mcfe).","units":{"MMBoe":[{"end":"2011-12-31","val":652,"accn":"0000912750-15-000009","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-24","frame":"CY2011Q4I"},{"end":"2012-12-31","val":566,"accn":"0000912750-15-000009","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-24","frame":"CY2012Q4I"},{"end":"2013-12-31","val":612,"accn":"0000912750-15-000009","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-24","frame":"CY2013Q4I"},{"end":"2014-12-31","val":645,"accn":"0000912750-15-000009","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-24","frame":"CY2014Q4I"}]}},"ProvedDevelopedAndUndevelopedReserveProductionEnergy":{"label":"Proved Developed and Undeveloped Reserve, Production (Energy)","description":"Energy measure of decrease in quantity of proved reserve of oil and gas resulting from production, stated in a unit of energy. For example, but not limited to, barrel of oil equivalents (BOE) or one thousand cubic feet of natural gas equivalent (Mcfe).","units":{"MMBoe":[{"start":"2012-01-01","end":"2012-12-31","val":51,"accn":"0000912750-15-000009","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-24","frame":"CY2012"},{"start":"2013-01-01","end":"2013-12-31","val":49,"accn":"0000912750-15-000009","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-24","frame":"CY2013"},{"start":"2014-01-01","end":"2014-12-31","val":50,"accn":"0000912750-15-000009","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-24","frame":"CY2014"}]}},"ProvedDevelopedAndUndevelopedReservePurchaseOfMineralInPlaceEnergy":{"label":"Proved Developed and Undeveloped Reserve, Purchase of Mineral in Place (Energy)","description":"Energy measure of increase in quantity of proved reserve of oil and gas resulting from purchase of mineral in place, stated in a unit of energy. For example, but not limited to, barrel of oil equivalents (BOE) or one thousand cubic feet of natural gas equivalent (Mcfe).","units":{"MMBoe":[{"start":"2012-01-01","end":"2012-12-31","val":0,"accn":"0000912750-15-000009","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-24","frame":"CY2012"},{"start":"2013-01-01","end":"2013-12-31","val":2,"accn":"0000912750-15-000009","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-24","frame":"CY2013"},{"start":"2014-01-01","end":"2014-12-31","val":9,"accn":"0000912750-15-000009","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-24","frame":"CY2014"}]}},"ProvedDevelopedAndUndevelopedReserveRevisionOfPreviousEstimateEnergy":{"label":"Proved Developed and Undeveloped Reserve, Revision of Previous Estimate (Energy)","description":"Energy measure of increase (decrease) in quantity of proved reserve of oil and gas related to revision of a previous estimate resulting from new information, except for an increase in proved acreage, or change in economic factors, stated in a unit of energy. For example, but not limited to, barrel of oil equivalents (BOE) or one thousand cubic feet of natural gas equivalent (Mcfe).","units":{"MMBoe":[{"start":"2012-01-01","end":"2012-12-31","val":-91,"accn":"0000912750-15-000009","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-24","frame":"CY2012"},{"start":"2013-01-01","end":"2013-12-31","val":14,"accn":"0000912750-15-000009","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-24","frame":"CY2013"},{"start":"2014-01-01","end":"2014-12-31","val":51,"accn":"0000912750-15-000009","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-24","frame":"CY2014"}]}},"ProvedDevelopedAndUndevelopedReservesExtensionsDiscoveriesAndAdditions":{"label":"Proved Developed and Undeveloped Reserves, Extensions, Discoveries, and Additions","description":"Additions to proved reserves that result from (1) extension of the proved acreage of previously discovered (old) reservoirs through additional drilling in periods after discovery and (2) discovery of new fields with proved reserves or of new reservoirs of proved reserves in old fields.","units":{"MBbls":[{"start":"2011-01-01","end":"2011-12-31","val":142000,"accn":"0000912750-14-000014","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-28","frame":"CY2011"},{"start":"2012-01-01","end":"2012-12-31","val":86000,"accn":"0000912750-14-000014","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-28","frame":"CY2012"},{"start":"2013-01-01","end":"2013-12-31","val":80000,"accn":"0000912750-14-000014","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-28","frame":"CY2013"}],"MMcf":[{"start":"2010-01-01","end":"2010-12-31","val":654000,"accn":"0001193125-13-077266","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-26","frame":"CY2010"},{"start":"2011-01-01","end":"2011-12-31","val":857000,"accn":"0001193125-13-077266","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-26","frame":"CY2011"},{"start":"2012-01-01","end":"2012-12-31","val":512000,"accn":"0001193125-13-077266","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-26","frame":"CY2012"}]}},"ProvedDevelopedAndUndevelopedReservesNet":{"label":"Proved Developed and Undeveloped Reserves, Net","description":"The net quantity of proved reserves as of the balance sheet date. Proved oil reserves are the estimated quantities of crude oil and natural gas liquids which geological and engineering data demonstrate with reasonable certainty to be recoverable.","units":{"MBbls":[{"end":"2010-12-31","val":619000,"accn":"0000912750-14-000014","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-28","frame":"CY2010Q4I"},{"end":"2011-12-31","val":652000,"accn":"0000912750-14-000014","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-28","frame":"CY2011Q4I"},{"end":"2012-12-31","val":566000,"accn":"0000912750-14-000014","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-28","frame":"CY2012Q4I"},{"end":"2013-12-31","val":612000,"accn":"0000912750-14-000014","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-28","frame":"CY2013Q4I"}]}},"ProvedDevelopedAndUndevelopedReservesProduction":{"label":"Proved Developed and Undeveloped Reserves, Production","description":"Production of proved reserves.","units":{"MBbls":[{"start":"2011-01-01","end":"2011-12-31","val":-50000,"accn":"0000912750-14-000014","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-28","frame":"CY2011"},{"start":"2012-01-01","end":"2012-12-31","val":-51000,"accn":"0000912750-14-000014","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-28","frame":"CY2012"},{"start":"2013-01-01","end":"2013-12-31","val":-49000,"accn":"0000912750-14-000014","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-28","frame":"CY2013"}],"MMcf":[{"start":"2010-01-01","end":"2010-12-31","val":-288000,"accn":"0001193125-13-077266","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-26","frame":"CY2010"},{"start":"2011-01-01","end":"2011-12-31","val":-300000,"accn":"0001193125-13-077266","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-26","frame":"CY2011"},{"start":"2012-01-01","end":"2012-12-31","val":-303000,"accn":"0001193125-13-077266","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-26","frame":"CY2012"}]}},"ProvedDevelopedAndUndevelopedReservesPurchasesOfMineralsInPlace":{"label":"Proved Developed and Undeveloped Reserves, Purchases of Minerals in Place","description":"Purchase of minerals in place.","units":{"MBbls":[{"start":"2011-01-01","end":"2011-12-31","val":9000,"accn":"0000912750-14-000014","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-28","frame":"CY2011"},{"start":"2012-01-01","end":"2012-12-31","val":0,"accn":"0000912750-14-000014","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-28","frame":"CY2012"},{"start":"2013-01-01","end":"2013-12-31","val":2000,"accn":"0000912750-14-000014","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-28","frame":"CY2013"}],"MMcf":[{"start":"2010-01-01","end":"2010-12-31","val":22000,"accn":"0001193125-13-077266","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-26","frame":"CY2010"},{"start":"2011-01-01","end":"2011-12-31","val":52000,"accn":"0001193125-13-077266","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-26","frame":"CY2011"},{"start":"2012-01-01","end":"2012-12-31","val":4000,"accn":"0001193125-13-077266","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-26","frame":"CY2012"}]}},"ProvedDevelopedAndUndevelopedReservesRevisionsOfPreviousEstimatesIncreaseDecrease":{"label":"Proved Developed and Undeveloped Reserves, Revisions of Previous Estimates","description":"Revisions represent changes in previous estimates of proved reserves, either upward or downward, resulting from new information (except for an increase in proved acreage) normally obtained from development drilling and production history or resulting from change in economic factors.","units":{"MBbls":[{"start":"2011-01-01","end":"2011-12-31","val":-48000,"accn":"0000912750-14-000014","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-28","frame":"CY2011"},{"start":"2012-01-01","end":"2012-12-31","val":-91000,"accn":"0000912750-14-000014","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-28","frame":"CY2012"},{"start":"2013-01-01","end":"2013-12-31","val":14000,"accn":"0000912750-14-000014","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-28","frame":"CY2013"}],"MMcf":[{"start":"2010-01-01","end":"2010-12-31","val":-289000,"accn":"0001193125-13-077266","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-26","frame":"CY2010"},{"start":"2011-01-01","end":"2011-12-31","val":-288000,"accn":"0001193125-13-077266","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-26","frame":"CY2011"},{"start":"2012-01-01","end":"2012-12-31","val":-546000,"accn":"0001193125-13-077266","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-26","frame":"CY2012"}]}},"ProvedDevelopedAndUndevelopedReservesSaleOfMineralInPlaceEnergy":{"label":"Proved Developed and Undeveloped Reserves, Sale of Mineral in Place (Energy)","description":"Energy measure of decrease in quantity of proved reserve of oil and gas resulting from sale of mineral in place, stated in a unit of energy. For example, but not limited to, barrel of oil equivalents (BOE) or one thousand cubic feet of natural gas equivalent (Mcfe).","units":{"MMBoe":[{"start":"2012-01-01","end":"2012-12-31","val":30,"accn":"0000912750-15-000009","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-24","frame":"CY2012"},{"start":"2013-01-01","end":"2013-12-31","val":1,"accn":"0000912750-15-000009","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-24","frame":"CY2013"},{"start":"2014-01-01","end":"2014-12-31","val":49,"accn":"0000912750-15-000009","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-24","frame":"CY2014"}]}},"ProvedDevelopedAndUndevelopedReservesSalesOfMineralsInPlace":{"label":"Proved Developed and Undeveloped Reserves, Sales of Minerals in Place","description":"Sales of minerals in place.","units":{"MBbls":[{"start":"2011-01-01","end":"2011-12-31","val":-20000,"accn":"0000912750-14-000014","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-28","frame":"CY2011"},{"start":"2012-01-01","end":"2012-12-31","val":-30000,"accn":"0000912750-14-000014","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-28","frame":"CY2012"},{"start":"2013-01-01","end":"2013-12-31","val":-1000,"accn":"0000912750-14-000014","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-28","frame":"CY2013"}],"MMcf":[{"start":"2010-01-01","end":"2010-12-31","val":-3000,"accn":"0001193125-13-077266","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-26","frame":"CY2010"},{"start":"2011-01-01","end":"2011-12-31","val":-122000,"accn":"0001193125-13-077266","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-26","frame":"CY2011"},{"start":"2012-01-01","end":"2012-12-31","val":-180000,"accn":"0001193125-13-077266","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-26","frame":"CY2012"}]}},"ProvedDevelopedReservesBOE1":{"label":"Proved Developed Reserves (Energy)","description":"Energy measure of interests in proved developed reserves of crude oil, including condensate and natural gas liquids, natural gas, synthetic oil and gas, or other nonrenewable natural resource that is intended to be upgraded into synthetic oil and gas.","units":{"MMBoe":[{"end":"2011-12-31","val":355,"accn":"0000912750-15-000009","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-24","frame":"CY2011Q4I"},{"end":"2012-12-31","val":298,"accn":"0000912750-15-000009","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-24","frame":"CY2012Q4I"},{"end":"2013-12-31","val":337,"accn":"0000912750-15-000009","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-24","frame":"CY2013Q4I"},{"end":"2014-12-31","val":338,"accn":"0000912750-15-000009","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-24","frame":"CY2014Q4I"}]}},"ProvedDevelopedReservesVolume":{"label":"Proved Developed Reserves (Volume)","description":"Net quantities of an enterprise's interests in proved developed reserves of either crude oil (including condensate and natural gas liquids), natural gas, synthetic oil and gas, or other nonrenewable natural resource that is intended to be upgraded into synthetic oil and gas as of the beginning and the end of the year. \"Net\" quantities of reserves include those relating to the enterprise's operating and nonoperating interests in properties. Quantities of reserves relating to royalty interests owned are included in \"net\" quantities if the necessary information is available to the enterprise. \"Net\" quantities does not include reserves relating to interests of others in properties owned by the enterprise. The unit of measure for reserve quantities is defined as \"barrels\" for oil and synthetic oil reserves or \"cubic feet\" or \"cubic meters\" for natural gas and synthetic gas reserves.","units":{"MBbls":[{"end":"2010-12-31","val":361000,"accn":"0000912750-14-000014","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-28","frame":"CY2010Q4I"},{"end":"2011-12-31","val":355000,"accn":"0000912750-14-000014","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-28","frame":"CY2011Q4I"},{"end":"2012-12-31","val":298000,"accn":"0000912750-14-000014","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-28","frame":"CY2012Q4I"},{"end":"2013-12-31","val":337000,"accn":"0000912750-14-000014","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-28","frame":"CY2013Q4I"}]}},"ProvedUndevelopedReserveBOE1":{"label":"Proved Undeveloped Reserves (Energy)","description":"Energy measure of proved undeveloped reserves of crude oil, including condensate and natural gas liquids, natural gas, synthetic oil and gas, or other nonrenewable natural resource that is intended to be upgraded into synthetic oil and gas.","units":{"MMBoe":[{"end":"2011-12-31","val":297,"accn":"0000912750-15-000009","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-24","frame":"CY2011Q4I"},{"end":"2012-12-31","val":268,"accn":"0000912750-15-000009","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-24","frame":"CY2012Q4I"},{"end":"2013-12-31","val":275,"accn":"0000912750-15-000009","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-24","frame":"CY2013Q4I"},{"end":"2014-12-31","val":307,"accn":"0000912750-15-000009","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-24","frame":"CY2014Q4I"}]}},"ProvedUndevelopedReserveVolume":{"label":"Proved Undeveloped Reserve (Volume)","description":"Net quantities of an enterprise's interests in proved undeveloped reserves of either crude oil (including condensate and natural gas liquids), natural gas, synthetic oil and gas, or other renewable natural resource that is intended to be upgraded into synthetic oil and gas as of the beginning and the end of the year. \"Net\" quantities of reserves include those relating to the enterprise's operating and nonoperating interests in properties. Quantities of reserves relating to royalty interests owned are included in \"net\" quantities if the necessary information is available to the enterprise. \"Net\" quantities does not include reserves relating to interests of others in properties owned by the enterprise. The unit of measure for reserve quantities is defined as \"barrels\" for oil and synthetic oil reserves or \"cubic feet\" or \"cubic meters\" for natural gas and synthetic gas reserves.","units":{"MBbls":[{"end":"2010-12-31","val":258000,"accn":"0000912750-14-000014","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-28","frame":"CY2010Q4I"},{"end":"2011-12-31","val":297000,"accn":"0000912750-14-000014","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-28","frame":"CY2011Q4I"},{"end":"2012-12-31","val":268000,"accn":"0000912750-14-000014","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-28","frame":"CY2012Q4I"},{"end":"2013-12-31","val":275000,"accn":"0000912750-14-000014","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-28","frame":"CY2013Q4I"}]}},"RatioOfIndebtednessToNetCapital":{"label":"Ratio of Indebtedness to Net Capital (Deprecated 2012-01-31)","description":"Total Aggregate Indebtedness divided by Net 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