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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 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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. 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The element may be used in both the balance sheet and disclosure in the same submission.","units":{"USD":[{"end":"2017-03-21","val":296061000,"accn":"0001564590-17-010817","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-15"},{"end":"2017-03-21","val":296061000,"accn":"0001564590-17-017525","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-14"},{"end":"2017-03-21","val":296061000,"accn":"0001564590-17-023596","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-14"},{"end":"2017-03-21","val":296061000,"accn":"0001564590-18-007003","fy":2017,"fp":"FY","form":"10-K","filed":"2018-03-29"},{"end":"2017-03-21","val":296061000,"accn":"0001346980-19-000016","fy":2018,"fp":"FY","form":"10-K","filed":"2019-03-14"},{"end":"2017-03-21","val":296061000,"accn":"0001346980-20-000035","fy":2019,"fp":"FY","form":"10-K","filed":"2020-03-12","frame":"CY2017Q1I"}]}},"LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive":{"label":"Long-Term Debt, Maturity, after Year Five","description":"Amount of long-term debt payable, sinking fund requirement, and other securities issued that are redeemable by holder at fixed or determinable price and date, maturing after fifth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).","units":{"USD":[{"end":"2012-12-31","val":1259045000,"accn":"0001193125-13-136192","fy":2012,"fp":"FY","form":"10-K","filed":"2013-04-01","frame":"CY2012Q4I"}]}},"LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths":{"label":"Long-Term Debt, Maturity, Year One","description":"Amount of long-term debt payable, sinking fund requirement, and other securities issued that are redeemable by holder at fixed or determinable price and date, maturing in next fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).","units":{"USD":[{"end":"2012-12-31","val":3746000,"accn":"0001193125-13-136192","fy":2012,"fp":"FY","form":"10-K","filed":"2013-04-01","frame":"CY2012Q4I"}]}},"LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive":{"label":"Long-Term Debt, Maturity, Year Five","description":"Amount of long-term debt payable, sinking fund requirement, and other securities issued that are redeemable by holder at fixed or determinable price and date, maturing in fifth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).","units":{"USD":[{"end":"2012-12-31","val":25646000,"accn":"0001193125-13-136192","fy":2012,"fp":"FY","form":"10-K","filed":"2013-04-01","frame":"CY2012Q4I"}]}},"LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour":{"label":"Long-Term Debt, Maturity, Year Four","description":"Amount of long-term debt payable, sinking fund requirement, and other securities issued that are redeemable by holder at fixed or determinable price and date, maturing in fourth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).","units":{"USD":[{"end":"2012-12-31","val":732000,"accn":"0001193125-13-136192","fy":2012,"fp":"FY","form":"10-K","filed":"2013-04-01","frame":"CY2012Q4I"}]}},"LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree":{"label":"Long-Term Debt, Maturity, Year Three","description":"Amount of long-term debt payable, sinking fund requirement, and other securities issued that are redeemable by holder at fixed or determinable price and date, maturing in third fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).","units":{"USD":[{"end":"2012-12-31","val":1473000,"accn":"0001193125-13-136192","fy":2012,"fp":"FY","form":"10-K","filed":"2013-04-01","frame":"CY2012Q4I"}]}},"LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo":{"label":"Long-Term Debt, Maturity, Year Two","description":"Amount of long-term debt payable, sinking fund requirement, and other securities issued that are redeemable by holder at fixed or determinable price and date, maturing in second fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).","units":{"USD":[{"end":"2012-12-31","val":2098000,"accn":"0001193125-13-136192","fy":2012,"fp":"FY","form":"10-K","filed":"2013-04-01","frame":"CY2012Q4I"}]}},"LongTermDebtNoncurrent":{"label":"Long-term Debt, Excluding Current Maturities","description":"Amount after unamortized (discount) premium and debt issuance costs of long-term debt classified as noncurrent and excluding amounts to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. 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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":{"MBoe":[{"start":"2013-01-01","end":"2013-12-31","val":4945,"accn":"0001564590-16-015629","fy":2015,"fp":"FY","form":"10-K","filed":"2016-03-30","frame":"CY2013"},{"start":"2014-01-01","end":"2014-12-31","val":474,"accn":"0001564590-16-015629","fy":2015,"fp":"FY","form":"10-K","filed":"2016-03-30"},{"start":"2014-01-01","end":"2014-12-31","val":474,"accn":"0001564590-17-005742","fy":2016,"fp":"FY","form":"10-K","filed":"2017-03-31","frame":"CY2014"},{"start":"2015-01-01","end":"2015-12-31","val":271,"accn":"0001564590-16-015629","fy":2015,"fp":"FY","form":"10-K","filed":"2016-03-30"},{"start":"2015-01-01","end":"2015-12-31","val":271,"accn":"0001564590-17-005742","fy":2016,"fp":"FY","form":"10-K","filed":"2017-03-31"},{"start":"2015-01-01","end":"2015-12-31","val":271,"accn":"0001564590-18-007003","fy":2017,"fp":"FY","form":"10-K","filed":"2018-03-29","frame":"CY2015"}]}},"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":{"MBoe":[{"start":"2013-01-01","end":"2013-12-31","val":-4671,"accn":"0001564590-16-015629","fy":2015,"fp":"FY","form":"10-K","filed":"2016-03-30","frame":"CY2013"},{"start":"2014-01-01","end":"2014-12-31","val":-3608,"accn":"0001564590-16-015629","fy":2015,"fp":"FY","form":"10-K","filed":"2016-03-30"},{"start":"2014-01-01","end":"2014-12-31","val":-3608,"accn":"0001564590-17-005742","fy":2016,"fp":"FY","form":"10-K","filed":"2017-03-31","frame":"CY2014"},{"start":"2015-01-01","end":"2015-12-31","val":-34426,"accn":"0001564590-16-015629","fy":2015,"fp":"FY","form":"10-K","filed":"2016-03-30"},{"start":"2015-01-01","end":"2015-12-31","val":-34426,"accn":"0001564590-17-005742","fy":2016,"fp":"FY","form":"10-K","filed":"2017-03-31"},{"start":"2015-01-01","end":"2015-12-31","val":-34426,"accn":"0001564590-18-007003","fy":2017,"fp":"FY","form":"10-K","filed":"2018-03-29","frame":"CY2015"},{"start":"2016-01-01","end":"2016-12-31","val":-23864,"accn":"0001564590-17-005742","fy":2016,"fp":"FY","form":"10-K","filed":"2017-03-31"},{"start":"2016-01-01","end":"2016-12-31","val":-23864,"accn":"0001564590-18-007003","fy":2017,"fp":"FY","form":"10-K","filed":"2018-03-29","frame":"CY2016"},{"start":"2017-01-01","end":"2017-12-31","val":7586,"accn":"0001564590-18-007003","fy":2017,"fp":"FY","form":"10-K","filed":"2018-03-29","frame":"CY2017"}]}},"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":{"MBoe":[{"start":"2013-01-01","end":"2013-12-31","val":7116,"accn":"0001564590-16-015629","fy":2015,"fp":"FY","form":"10-K","filed":"2016-03-30","frame":"CY2013"},{"start":"2014-01-01","end":"2014-12-31","val":23761,"accn":"0001564590-16-015629","fy":2015,"fp":"FY","form":"10-K","filed":"2016-03-30"},{"start":"2014-01-01","end":"2014-12-31","val":23761,"accn":"0001564590-17-005742","fy":2016,"fp":"FY","form":"10-K","filed":"2017-03-31","frame":"CY2014"},{"start":"2015-01-01","end":"2015-12-31","val":2951,"accn":"0001564590-16-015629","fy":2015,"fp":"FY","form":"10-K","filed":"2016-03-30"},{"start":"2015-01-01","end":"2015-12-31","val":2951,"accn":"0001564590-17-005742","fy":2016,"fp":"FY","form":"10-K","filed":"2017-03-31"},{"start":"2015-01-01","end":"2015-12-31","val":2951,"accn":"0001564590-18-007003","fy":2017,"fp":"FY","form":"10-K","filed":"2018-03-29","frame":"CY2015"},{"start":"2017-01-01","end":"2017-12-31","val":75241,"accn":"0001564590-18-007003","fy":2017,"fp":"FY","form":"10-K","filed":"2018-03-29","frame":"CY2017"}]}},"ProvedDevelopedReservesBOE":{"label":"Proved Developed Reserves (BOE) (Deprecated 2013-01-31)","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 do not include reserves relating to interests of others in properties owned by the enterprise. Measured in barrel of oil equivalent (BOE).","units":{"MBbls":[{"end":"2009-12-31","val":93862,"accn":"0001193125-13-136192","fy":2012,"fp":"FY","form":"10-K","filed":"2013-04-01","frame":"CY2009Q4I"},{"end":"2010-12-31","val":98566,"accn":"0001193125-13-136192","fy":2012,"fp":"FY","form":"10-K","filed":"2013-04-01","frame":"CY2010Q4I"},{"end":"2011-12-31","val":100118,"accn":"0001193125-13-136192","fy":2012,"fp":"FY","form":"10-K","filed":"2013-04-01","frame":"CY2011Q4I"},{"end":"2012-12-31","val":94927,"accn":"0001193125-13-136192","fy":2012,"fp":"FY","form":"10-K","filed":"2013-04-01","frame":"CY2012Q4I"}]}},"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":{"MBoe":[{"end":"2010-12-31","val":98566,"accn":"0001346980-14-000011","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-31","frame":"CY2010Q4I"},{"end":"2011-12-31","val":100118,"accn":"0001346980-14-000011","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-31","frame":"CY2011Q4I"},{"end":"2012-01-01","val":100000,"accn":"0001346980-15-000013","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-31"},{"end":"2012-12-31","val":94927,"accn":"0001346980-14-000011","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-31"},{"end":"2012-12-31","val":95000,"accn":"0001346980-15-000013","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-31","frame":"CY2012Q4I"},{"end":"2013-01-01","val":94926,"accn":"0001564590-16-015629","fy":2015,"fp":"FY","form":"10-K","filed":"2016-03-30"},{"end":"2013-12-31","val":100664,"accn":"0001346980-14-000011","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-31"},{"end":"2013-12-31","val":100664,"accn":"0001346980-15-000013","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-31"},{"end":"2013-12-31","val":100664,"accn":"0001564590-16-015629","fy":2015,"fp":"FY","form":"10-K","filed":"2016-03-30","frame":"CY2013Q4I"},{"end":"2014-01-01","val":100664,"accn":"0001564590-17-005742","fy":2016,"fp":"FY","form":"10-K","filed":"2017-03-31"},{"end":"2014-12-31","val":93027,"accn":"0001346980-15-000013","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-31"},{"end":"2014-12-31","val":93027,"accn":"0001564590-16-015629","fy":2015,"fp":"FY","form":"10-K","filed":"2016-03-30"},{"end":"2014-12-31","val":93027,"accn":"0001564590-17-005742","fy":2016,"fp":"FY","form":"10-K","filed":"2017-03-31","frame":"CY2014Q4I"},{"end":"2015-01-01","val":93027,"accn":"0001564590-18-007003","fy":2017,"fp":"FY","form":"10-K","filed":"2018-03-29"},{"end":"2015-12-31","val":71524,"accn":"0001564590-16-015629","fy":2015,"fp":"FY","form":"10-K","filed":"2016-03-30"},{"end":"2015-12-31","val":71524,"accn":"0001564590-17-005742","fy":2016,"fp":"FY","form":"10-K","filed":"2017-03-31"},{"end":"2015-12-31","val":71524,"accn":"0001564590-18-007003","fy":2017,"fp":"FY","form":"10-K","filed":"2018-03-29","frame":"CY2015Q4I"},{"end":"2016-12-31","val":56076,"accn":"0001564590-17-005742","fy":2016,"fp":"FY","form":"10-K","filed":"2017-03-31"},{"end":"2016-12-31","val":56076,"accn":"0001564590-18-007003","fy":2017,"fp":"FY","form":"10-K","filed":"2018-03-29","frame":"CY2016Q4I"},{"end":"2017-12-31","val":50734,"accn":"0001564590-18-007003","fy":2017,"fp":"FY","form":"10-K","filed":"2018-03-29","frame":"CY2017Q4I"}]}},"ProvedUndevelopedReserveBOE":{"label":"Proved Undeveloped Reserve (BOE) (Deprecated 2013-01-31)","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 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 do not include reserves relating to interests of others in properties owned by the enterprise. Measured in barrel of oil equivalent (BOE).","units":{"MBbls":[{"end":"2009-12-31","val":48012,"accn":"0001193125-13-136192","fy":2012,"fp":"FY","form":"10-K","filed":"2013-04-01","frame":"CY2009Q4I"},{"end":"2010-12-31","val":50716,"accn":"0001193125-13-136192","fy":2012,"fp":"FY","form":"10-K","filed":"2013-04-01","frame":"CY2010Q4I"},{"end":"2011-12-31","val":56142,"accn":"0001193125-13-136192","fy":2012,"fp":"FY","form":"10-K","filed":"2013-04-01","frame":"CY2011Q4I"},{"end":"2012-12-31","val":51169,"accn":"0001193125-13-136192","fy":2012,"fp":"FY","form":"10-K","filed":"2013-04-01","frame":"CY2012Q4I"}]}},"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 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