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Excludes cash and cash equivalents within disposal group and discontinued operation.","units":{"USD":[{"end":"2013-12-31","val":11900000,"accn":"0001108827-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-24"},{"end":"2013-12-31","val":11900000,"accn":"0001108827-15-000009","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-25","frame":"CY2013Q4I"},{"end":"2014-12-31","val":1160100000,"accn":"0001108827-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-24"},{"end":"2014-12-31","val":1160100000,"accn":"0001108827-15-000009","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-25"},{"end":"2014-12-31","val":1160100000,"accn":"0001108827-16-000057","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-24","frame":"CY2014Q4I"},{"end":"2015-12-31","val":376100000,"accn":"0001108827-16-000057","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-24"},{"end":"2015-12-31","val":376100000,"accn":"0001108827-17-000007","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-22","frame":"CY2015Q4I"},{"end":"2016-12-31","val":443800000,"accn":"0001108827-17-000007","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-22"},{"end":"2016-12-31","val":443800000,"accn":"0001108827-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-28","frame":"CY2016Q4I"},{"end":"2017-12-31","val":0,"accn":"0001108827-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-28"},{"end":"2017-12-31","val":0,"accn":"0001108827-19-000010","fy":2018,"fp":"FY","form":"10-K","filed":"2019-02-20","frame":"CY2017Q4I"},{"end":"2018-12-31","val":0,"accn":"0001108827-19-000010","fy":2018,"fp":"FY","form":"10-K","filed":"2019-02-20"},{"end":"2018-12-31","val":0,"accn":"0001108827-20-000009","fy":2019,"fp":"FY","form":"10-K","filed":"2020-02-26","frame":"CY2018Q4I"},{"end":"2019-12-31","val":166300000,"accn":"0001108827-20-000009","fy":2019,"fp":"FY","form":"10-K","filed":"2020-02-26","frame":"CY2019Q4I"}]}},"CashFlowHedgeGainLossReclassifiedToEarningsNet":{"label":"Cash Flow Hedge Gain (Loss) Reclassified to Earnings, Net (Deprecated 2013-01-31)","description":"The amount of net gains or losses on a cash flow hedge reclassified in the period to earnings from accumulated other comprehensive income.","units":{"USD":[{"start":"2012-01-01","end":"2012-12-31","val":171100000,"accn":"0001108827-13-000008","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2012"}]}},"CashFlowHedgeGainLossToBeReclassifiedWithinTwelveMonths":{"label":"Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months","description":"The estimated net amount of existing gains or losses on cash flow hedges at the reporting date expected to be reclassified to earnings within the next 12 months.","units":{"USD":[{"start":"2011-01-01","end":"2011-12-31","val":171100000,"accn":"0001140361-12-010483","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-24","frame":"CY2011"},{"start":"2012-01-01","end":"2012-03-31","val":144200000,"accn":"0001140361-12-021551","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-04-26","frame":"CY2012Q1"},{"start":"2012-01-01","end":"2012-06-30","val":120000000,"accn":"0001140361-12-034461","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-07-31"},{"start":"2012-01-01","end":"2012-09-30","val":97700000,"accn":"0001108827-12-000006","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-10-30"},{"start":"2012-01-01","end":"2012-12-31","val":77600000,"accn":"0001108827-13-000008","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2012"},{"start":"2013-01-01","end":"2013-03-31","val":57400000,"accn":"0001108827-13-000013","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-04-30","frame":"CY2013Q1"},{"start":"2013-01-01","end":"2013-06-30","val":36900000,"accn":"0001108827-13-000024","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-07-31"}]}},"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":"2009-01-01","end":"2009-12-31","val":53400000,"accn":"0001140361-12-010483","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-24","frame":"CY2009"},{"start":"2010-01-01","end":"2010-06-30","val":-26900000,"accn":"0001193125-11-202252","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-07-29"},{"start":"2010-01-01","end":"2010-09-30","val":-26900000,"accn":"0001140361-11-050658","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-10-28"},{"start":"2010-01-01","end":"2010-12-31","val":26900000,"accn":"0001140361-12-010483","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-24"},{"start":"2010-01-01","end":"2010-12-31","val":-26900000,"accn":"0001108827-13-000008","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2010"},{"start":"2011-01-01","end":"2011-09-30","val":0,"accn":"0001140361-11-050658","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-10-28"},{"start":"2011-01-01","end":"2011-12-31","val":0,"accn":"0001140361-12-010483","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-24"},{"start":"2011-01-01","end":"2011-12-31","val":0,"accn":"0001108827-13-000008","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2011"},{"start":"2012-01-01","end":"2012-12-31","val":0,"accn":"0001108827-13-000008","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2012"}]}},"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":"2009-01-01","end":"2009-12-31","val":116200000,"accn":"0001140361-12-010483","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-24","frame":"CY2009"},{"start":"2010-01-01","end":"2010-06-30","val":-39900000,"accn":"0001193125-11-202252","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-07-29"},{"start":"2010-01-01","end":"2010-09-30","val":-39900000,"accn":"0001140361-11-050658","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-10-28"},{"start":"2010-01-01","end":"2010-12-31","val":39900000,"accn":"0001140361-12-010483","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-24"},{"start":"2010-01-01","end":"2010-12-31","val":-39900000,"accn":"0001108827-13-000008","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2010"},{"start":"2011-01-01","end":"2011-09-30","val":0,"accn":"0001140361-11-050658","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-10-28"},{"start":"2011-01-01","end":"2011-12-31","val":0,"accn":"0001140361-12-010483","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-24"},{"start":"2011-01-01","end":"2011-12-31","val":0,"accn":"0001108827-13-000008","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2011"},{"start":"2012-01-01","end":"2012-12-31","val":0,"accn":"0001108827-13-000008","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2012"}]}},"CashProvidedByUsedInOperatingActivitiesDiscontinuedOperations":{"label":"Cash Provided by (Used in) Operating Activities, Discontinued Operations","description":"Amount of cash inflow (outflow) of operating activities of discontinued operations. Operating activity cash flows include transactions, adjustments, and changes in value not defined as investing or financing 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taxonomy.","units":{"USD":[{"end":"2014-03-31","val":50000000,"accn":"0001108827-14-000028","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-07","frame":"CY2014Q1I"},{"end":"2014-06-30","val":50000000,"accn":"0001108827-14-000043","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-06","frame":"CY2014Q2I"},{"end":"2014-09-30","val":50000000,"accn":"0001108827-14-000058","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-05","frame":"CY2014Q3I"},{"end":"2014-12-31","val":50000000,"accn":"0001108827-15-000023","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-04-29"},{"end":"2014-12-31","val":50000000,"accn":"0001108827-15-000034","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-03","frame":"CY2014Q4I"},{"end":"2018-12-31","val":32200000,"accn":"0001108827-19-000010","fy":2018,"fp":"FY","form":"10-K","filed":"2019-02-20","frame":"CY2018Q4I"},{"end":"2019-03-31","val":22100000,"accn":"0001108827-19-000028","fy":2019,"fp":"Q1","form":"10-Q","filed":"2019-04-24","frame":"CY2019Q1I"}]}},"EscrowDepositsRelatedToPropertySales":{"label":"Escrow Deposits Related to Property Sales","description":"Escrow deposits related to property sales in noncash investing and financing activities.","units":{"USD":[{"start":"2013-01-01","end":"2013-03-31","val":0,"accn":"0001108827-14-000028","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-07","frame":"CY2013Q1"},{"start":"2013-01-01","end":"2013-06-30","val":0,"accn":"0001108827-14-000043","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-06"},{"start":"2013-01-01","end":"2013-09-30","val":0,"accn":"0001108827-14-000058","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-05"},{"start":"2014-01-01","end":"2014-03-31","val":50000000,"accn":"0001108827-14-000028","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-07","frame":"CY2014Q1"},{"start":"2014-01-01","end":"2014-06-30","val":50000000,"accn":"0001108827-14-000043","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-06"},{"start":"2014-01-01","end":"2014-09-30","val":50000000,"accn":"0001108827-14-000058","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-05"}]}},"ExcessTaxBenefitFromShareBasedCompensationFinancingActivities":{"label":"Excess Tax Benefit from Share-based Compensation, Financing Activities","description":"Amount of cash inflow from realized tax benefit related to deductible compensation cost reported on the entity's tax return for equity instruments in excess of the compensation cost for those instruments recognized for financial reporting purposes.","units":{"USD":[{"start":"2010-01-01","end":"2010-12-31","val":0,"accn":"0001108827-13-000008","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2010"},{"start":"2011-01-01","end":"2011-03-31","val":400000,"accn":"0001140361-12-021551","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-04-26","frame":"CY2011Q1"},{"start":"2011-01-01","end":"2011-06-30","val":1400000,"accn":"0001140361-12-034461","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-07-31"},{"start":"2011-01-01","end":"2011-09-30","val":1500000,"accn":"0001108827-12-000006","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-10-30"},{"start":"2011-01-01","end":"2011-12-31","val":1600000,"accn":"0001108827-13-000008","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"start":"2011-01-01","end":"2011-12-31","val":1600000,"accn":"0001108827-14-000016","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-25","frame":"CY2011"},{"start":"2012-01-01","end":"2012-03-31","val":2000000,"accn":"0001140361-12-021551","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-04-26"},{"start":"2012-01-01","end":"2012-03-31","val":2000000,"accn":"0001108827-13-000013","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-04-30","frame":"CY2012Q1"},{"start":"2012-01-01","end":"2012-06-30","val":2000000,"accn":"0001140361-12-034461","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-07-31"},{"start":"2012-01-01","end":"2012-06-30","val":2000000,"accn":"0001108827-13-000024","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-07-31"},{"start":"2012-01-01","end":"2012-09-30","val":2000000,"accn":"0001108827-12-000006","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-10-30"},{"start":"2012-01-01","end":"2012-09-30","val":2000000,"accn":"0001445305-13-002709","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-05"},{"start":"2012-01-01","end":"2012-12-31","val":2200000,"accn":"0001108827-13-000008","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"start":"2012-01-01","end":"2012-12-31","val":2200000,"accn":"0001108827-14-000016","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-25"},{"start":"2012-01-01","end":"2012-12-31","val":2200000,"accn":"0001108827-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-24"},{"start":"2012-01-01","end":"2012-12-31","val":2200000,"accn":"0001108827-15-000009","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-25","frame":"CY2012"},{"start":"2013-01-01","end":"2013-03-31","val":1000000,"accn":"0001108827-13-000013","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-04-30"},{"start":"2013-01-01","end":"2013-03-31","val":1000000,"accn":"0001108827-14-000028","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-07","frame":"CY2013Q1"},{"start":"2013-01-01","end":"2013-06-30","val":1300000,"accn":"0001108827-13-000024","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-07-31"},{"start":"2013-01-01","end":"2013-06-30","val":1300000,"accn":"0001108827-14-000043","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-06"},{"start":"2013-01-01","end":"2013-09-30","val":1300000,"accn":"0001445305-13-002709","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-05"},{"start":"2013-01-01","end":"2013-09-30","val":1300000,"accn":"0001108827-14-000058","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-05"},{"start":"2013-01-01","end":"2013-12-31","val":0,"accn":"0001108827-14-000016","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-25"},{"start":"2013-01-01","end":"2013-12-31","val":0,"accn":"0001108827-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-24"},{"start":"2013-01-01","end":"2013-12-31","val":0,"accn":"0001108827-15-000009","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-25","frame":"CY2013"},{"start":"2014-01-01","end":"2014-03-31","val":-600000,"accn":"0001108827-14-000028","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-07"},{"start":"2014-01-01","end":"2014-03-31","val":-600000,"accn":"0001108827-15-000023","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-04-29","frame":"CY2014Q1"},{"start":"2014-01-01","end":"2014-06-30","val":-600000,"accn":"0001108827-14-000043","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-06"},{"start":"2014-01-01","end":"2014-06-30","val":-600000,"accn":"0001108827-15-000034","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-03"},{"start":"2014-01-01","end":"2014-09-30","val":-600000,"accn":"0001108827-14-000058","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-05"},{"start":"2014-01-01","end":"2014-09-30","val":-600000,"accn":"0001108827-15-000042","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-10-28"},{"start":"2014-01-01","end":"2014-12-31","val":-500000,"accn":"0001108827-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-24"},{"start":"2014-01-01","end":"2014-12-31","val":-500000,"accn":"0001108827-15-000009","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-25","frame":"CY2014"},{"start":"2015-01-01","end":"2015-03-31","val":-1800000,"accn":"0001108827-15-000023","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-04-29","frame":"CY2015Q1"},{"start":"2015-01-01","end":"2015-06-30","val":-1800000,"accn":"0001108827-15-000034","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-03"},{"start":"2015-01-01","end":"2015-09-30","val":-2400000,"accn":"0001108827-15-000042","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-10-28"}]}},"ExplorationAbandonmentAndImpairmentExpense":{"label":"Exploration Abandonment and Impairment Expense","description":"The adjustment to expense previously capitalized costs of drilling exploratory wells when proved reserves are not found or when the entity obtains information that raises substantial doubt about the economic or operational viability of the project.","units":{"USD":[{"start":"2009-01-01","end":"2009-12-31","val":20300000,"accn":"0001140361-12-010483","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-24","frame":"CY2009"},{"start":"2010-01-01","end":"2010-06-30","val":16900000,"accn":"0001193125-11-202252","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-07-29"},{"start":"2010-04-01","end":"2010-06-30","val":9300000,"accn":"0001193125-11-202252","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-07-29","frame":"CY2010Q2"},{"start":"2010-01-01","end":"2010-09-30","val":29100000,"accn":"0001140361-11-050658","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-10-28"},{"start":"2010-07-01","end":"2010-09-30","val":12200000,"accn":"0001140361-11-050658","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-10-28","frame":"CY2010Q3"},{"start":"2010-01-01","end":"2010-12-31","val":46100000,"accn":"0001140361-12-010483","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-24","frame":"CY2010"},{"start":"2011-01-01","end":"2011-03-31","val":5400000,"accn":"0001140361-12-021551","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-04-26","frame":"CY2011Q1"},{"start":"2011-01-01","end":"2011-06-30","val":10700000,"accn":"0001193125-11-202252","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-07-29"},{"start":"2011-04-01","end":"2011-06-30","val":5300000,"accn":"0001193125-11-202252","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-07-29","frame":"CY2011Q2"},{"start":"2011-01-01","end":"2011-09-30","val":16400000,"accn":"0001140361-11-050658","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-10-28"},{"start":"2011-07-01","end":"2011-09-30","val":5700000,"accn":"0001140361-11-050658","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-10-28","frame":"CY2011Q3"},{"start":"2011-01-01","end":"2011-12-31","val":218400000,"accn":"0001140361-12-010483","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-24","frame":"CY2011"},{"start":"2012-01-01","end":"2012-03-31","val":6600000,"accn":"0001140361-12-021551","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-04-26","frame":"CY2012Q1"}]}},"ExplorationAndProductionRevenue":{"label":"Exploration and Production Revenue (Deprecated 2018-01-31)","description":"Revenue related to the upstream oil and gas activities, such as exploration, development, and production of crude petroleum.","units":{"USD":[{"start":"2017-01-01","end":"2017-03-31","val":385200000,"accn":"0001108827-18-000023","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-04-25","frame":"CY2017Q1"},{"start":"2017-01-01","end":"2017-06-30","val":758200000,"accn":"0001108827-18-000035","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-07-25"},{"start":"2017-04-01","end":"2017-06-30","val":373000000,"accn":"0001108827-18-000035","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-07-25","frame":"CY2017Q2"},{"start":"2017-01-01","end":"2017-09-30","val":1139100000,"accn":"0001108827-18-000044","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-07"},{"start":"2017-07-01","end":"2017-09-30","val":380900000,"accn":"0001108827-18-000044","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-07","frame":"CY2017Q3"},{"start":"2018-01-01","end":"2018-03-31","val":409800000,"accn":"0001108827-18-000023","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-04-25"},{"start":"2018-01-01","end":"2018-03-31","val":409800000,"accn":"0001108827-19-000028","fy":2019,"fp":"Q1","form":"10-Q","filed":"2019-04-24","frame":"CY2018Q1"},{"start":"2018-01-01","end":"2018-06-30","val":930100000,"accn":"0001108827-18-000035","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-07-25"},{"start":"2018-04-01","end":"2018-06-30","val":520300000,"accn":"0001108827-18-000035","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-07-25","frame":"CY2018Q2"},{"start":"2018-01-01","end":"2018-09-30","val":1474100000,"accn":"0001108827-18-000044","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-07"},{"start":"2018-07-01","end":"2018-09-30","val":544000000,"accn":"0001108827-18-000044","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-07","frame":"CY2018Q3"},{"start":"2019-01-01","end":"2019-03-31","val":275600000,"accn":"0001108827-19-000028","fy":2019,"fp":"Q1","form":"10-Q","filed":"2019-04-24","frame":"CY2019Q1"}]}},"ExplorationExpense":{"label":"Exploration 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Costs incurred in identifying areas that may warrant examination and in examining specific areas that are considered to have prospects of containing oil and gas reserves, including costs of drilling exploratory wells and exploratory-type stratigraphic test wells. Exploration costs may be incurred both before acquiring the related property (sometimes referred to in part as prospecting costs) and after acquiring the property. Principal types of exploration costs, which include depreciation and applicable operating costs of support equipment and facilities and other costs of exploration activities, are: (i) Costs of topographical, geographical and geophysical studies, rights of access to properties to conduct those studies, and salaries and other expenses of geologists, geophysical crews, and others conducting those studies. Collectively, these are sometimes referred to as geological and geophysical or \"\"G&G\"\" costs. (ii) Costs of carrying and retaining undeveloped properties, such as delay rentals, ad valorem taxes on properties, legal costs for title defense, and the maintenance of land and lease records. (iii) Dry hole contributions and bottom hole contributions. (iv) Costs of drilling and equipping exploratory wells. 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