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Includes excise taxes, which are applied to specific types of transactions or items (such as gasoline or alcohol); and sales, use and value added taxes, which are applied to a broad class of revenue-producing transactions involving a wide range of goods and services.","units":{"USD":[{"start":"2008-01-01","end":"2008-06-30","val":94000000,"accn":"0000072207-09-000031","fy":2009,"fp":"Q2","form":"10-Q","filed":"2009-07-30"},{"start":"2008-04-01","end":"2008-06-30","val":51000000,"accn":"0000072207-09-000031","fy":2009,"fp":"Q2","form":"10-Q","filed":"2009-07-30","frame":"CY2008Q2"},{"start":"2008-01-01","end":"2008-09-30","val":141000000,"accn":"0000072207-09-000038","fy":2009,"fp":"Q3","form":"10-Q","filed":"2009-10-29"},{"start":"2008-07-01","end":"2008-09-30","val":47000000,"accn":"0000072207-09-000038","fy":2009,"fp":"Q3","form":"10-Q","filed":"2009-10-29","frame":"CY2008Q3"},{"start":"2009-01-01","end":"2009-06-30","val":42000000,"accn":"0000072207-09-000031","fy":2009,"fp":"Q2","form":"10-Q","filed":"2009-07-30"},{"start":"2009-04-01","end":"2009-06-30","val":23000000,"accn":"0000072207-09-000031","fy":2009,"fp":"Q2","form":"10-Q","filed":"2009-07-30","frame":"CY2009Q2"},{"start":"2009-01-01","end":"2009-09-30","val":66000000,"accn":"0000072207-09-000038","fy":2009,"fp":"Q3","form":"10-Q","filed":"2009-10-29"},{"start":"2009-07-01","end":"2009-09-30","val":25000000,"accn":"0000072207-09-000038","fy":2009,"fp":"Q3","form":"10-Q","filed":"2009-10-29","frame":"CY2009Q3"}]}},"ExplorationAbandonmentAndImpairmentExpense":{"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. 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Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).","units":{"USD":[{"end":"2010-12-31","val":0,"accn":"0001140361-11-007888","fy":2010,"fp":"FY","form":"10-K","filed":"2011-02-10","frame":"CY2010Q4I"},{"end":"2011-03-31","val":0,"accn":"0001140361-11-023588","fy":2011,"fp":"Q1","form":"10-Q","filed":"2011-04-28","frame":"CY2011Q1I"},{"end":"2011-06-30","val":0,"accn":"0001140361-11-038302","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-07-28","frame":"CY2011Q2I"},{"end":"2011-09-30","val":0,"accn":"0001140361-11-049923","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-10-20","frame":"CY2011Q3I"},{"end":"2011-12-31","val":0,"accn":"0001140361-12-006454","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-09","frame":"CY2011Q4I"},{"end":"2012-12-31","val":0,"accn":"0000072207-13-000013","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-07","frame":"CY2012Q4I"},{"end":"2013-12-31","val":0,"accn":"0000072207-14-000008","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-06","frame":"CY2013Q4I"},{"end":"2014-12-31","val":1000000000,"accn":"0000072207-15-000007","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-19","frame":"CY2014Q4I"},{"end":"2015-12-31","val":0,"accn":"0000072207-16-000070","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-17","frame":"CY2015Q4I"},{"end":"2016-12-31","val":1379000000,"accn":"0000072207-17-000014","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-14","frame":"CY2016Q4I"},{"end":"2017-09-30","val":1379000000,"accn":"0000072207-17-000089","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-10-31","frame":"CY2017Q3I"},{"end":"2017-12-31","val":0,"accn":"0000072207-18-000020","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-20","frame":"CY2017Q4I"},{"end":"2018-12-31","val":160000000,"accn":"0000072207-19-000018","fy":2018,"fp":"FY","form":"10-K","filed":"2019-02-19","frame":"CY2018Q4I"},{"end":"2019-12-31","val":650000000,"accn":"0000072207-20-000010","fy":2019,"fp":"FY","form":"10-K","filed":"2020-02-12","frame":"CY2019Q4I"}]}},"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":"2010-12-31","val":200000000,"accn":"0001140361-11-007888","fy":2010,"fp":"FY","form":"10-K","filed":"2011-02-10","frame":"CY2010Q4I"},{"end":"2011-03-31","val":200000000,"accn":"0001140361-11-023588","fy":2011,"fp":"Q1","form":"10-Q","filed":"2011-04-28","frame":"CY2011Q1I"},{"end":"2011-06-30","val":200000000,"accn":"0001140361-11-038302","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-07-28","frame":"CY2011Q2I"},{"end":"2011-09-30","val":200000000,"accn":"0001140361-11-049923","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-10-20","frame":"CY2011Q3I"},{"end":"2011-12-31","val":0,"accn":"0001140361-12-006454","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-09","frame":"CY2011Q4I"},{"end":"2012-12-31","val":0,"accn":"0000072207-13-000013","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-07","frame":"CY2012Q4I"},{"end":"2013-12-31","val":0,"accn":"0000072207-14-000008","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-06","frame":"CY2013Q4I"},{"end":"2014-12-31","val":0,"accn":"0000072207-15-000007","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-19","frame":"CY2014Q4I"},{"end":"2015-12-31","val":1000000000,"accn":"0000072207-16-000070","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-17","frame":"CY2015Q4I"},{"end":"2016-12-31","val":0,"accn":"0000072207-17-000014","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-14","frame":"CY2016Q4I"},{"end":"2017-09-30","val":0,"accn":"0000072207-17-000089","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-10-31","frame":"CY2017Q3I"},{"end":"2017-12-31","val":1464000000,"accn":"0000072207-18-000020","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-20","frame":"CY2017Q4I"},{"end":"2018-12-31","val":0,"accn":"0000072207-19-000018","fy":2018,"fp":"FY","form":"10-K","filed":"2019-02-19","frame":"CY2018Q4I"},{"end":"2019-12-31","val":695000000,"accn":"0000072207-20-000010","fy":2019,"fp":"FY","form":"10-K","filed":"2020-02-12","frame":"CY2019Q4I"}]}},"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":"2010-12-31","val":0,"accn":"0001140361-11-007888","fy":2010,"fp":"FY","form":"10-K","filed":"2011-02-10","frame":"CY2010Q4I"},{"end":"2011-03-31","val":0,"accn":"0001140361-11-023588","fy":2011,"fp":"Q1","form":"10-Q","filed":"2011-04-28","frame":"CY2011Q1I"},{"end":"2011-06-30","val":0,"accn":"0001140361-11-038302","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-07-28","frame":"CY2011Q2I"},{"end":"2011-09-30","val":328000000,"accn":"0001140361-11-049923","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-10-20","frame":"CY2011Q3I"},{"end":"2011-12-31","val":200000000,"accn":"0001140361-12-006454","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-09","frame":"CY2011Q4I"},{"end":"2012-12-31","val":0,"accn":"0000072207-13-000013","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-07","frame":"CY2012Q4I"},{"end":"2013-12-31","val":0,"accn":"0000072207-14-000008","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-06","frame":"CY2013Q4I"},{"end":"2014-12-31","val":0,"accn":"0000072207-15-000007","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-19","frame":"CY2014Q4I"},{"end":"2015-12-31","val":0,"accn":"0000072207-16-000070","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-17","frame":"CY2015Q4I"},{"end":"2016-12-31","val":1550000000,"accn":"0000072207-17-000014","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-14","frame":"CY2016Q4I"},{"end":"2017-09-30","val":550000000,"accn":"0000072207-17-000089","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-10-31","frame":"CY2017Q3I"},{"end":"2017-12-31","val":230000000,"accn":"0000072207-18-000020","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-20","frame":"CY2017Q4I"},{"end":"2018-12-31","val":1500000000,"accn":"0000072207-19-000018","fy":2018,"fp":"FY","form":"10-K","filed":"2019-02-19","frame":"CY2018Q4I"},{"end":"2019-12-31","val":400000000,"accn":"0000072207-20-000010","fy":2019,"fp":"FY","form":"10-K","filed":"2020-02-12","frame":"CY2019Q4I"}]}},"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. 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