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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 rates.","units":{"USD":[{"end":"2017-12-31","val":2180000,"accn":"0000805022-19-000024","fy":2019,"fp":"Q1","form":"10-Q","filed":"2019-05-10"},{"end":"2017-12-31","val":2180000,"accn":"0000805022-19-000030","fy":2019,"fp":"Q2","form":"10-Q","filed":"2019-08-01"},{"end":"2017-12-31","val":2180000,"accn":"0000805022-19-000039","fy":2019,"fp":"Q3","form":"10-Q","filed":"2019-11-01","frame":"CY2017Q4I"},{"end":"2018-03-31","val":6607000,"accn":"0000805022-19-000024","fy":2019,"fp":"Q1","form":"10-Q","filed":"2019-05-10","frame":"CY2018Q1I"},{"end":"2018-06-30","val":1657000,"accn":"0000805022-19-000030","fy":2019,"fp":"Q2","form":"10-Q","filed":"2019-08-01","frame":"CY2018Q2I"},{"end":"2018-09-30","val":661000,"accn":"0000805022-19-000039","fy":2019,"fp":"Q3","form":"10-Q","filed":"2019-11-01","frame":"CY2018Q3I"},{"end":"2018-12-31","val":1830000,"accn":"0000805022-19-000024","fy":2019,"fp":"Q1","form":"10-Q","filed":"2019-05-10"},{"end":"2018-12-31","val":1830000,"accn":"0000805022-19-000030","fy":2019,"fp":"Q2","form":"10-Q","filed":"2019-08-01"},{"end":"2018-12-31","val":1830000,"accn":"0000805022-19-000039","fy":2019,"fp":"Q3","form":"10-Q","filed":"2019-11-01","frame":"CY2018Q4I"},{"end":"2019-03-31","val":1516000,"accn":"0000805022-19-000024","fy":2019,"fp":"Q1","form":"10-Q","filed":"2019-05-10","frame":"CY2019Q1I"},{"end":"2019-06-30","val":6291000,"accn":"0000805022-19-000030","fy":2019,"fp":"Q2","form":"10-Q","filed":"2019-08-01","frame":"CY2019Q2I"},{"end":"2019-09-30","val":1398000,"accn":"0000805022-19-000039","fy":2019,"fp":"Q3","form":"10-Q","filed":"2019-11-01","frame":"CY2019Q3I"}]}},"CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect":{"label":"Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect","description":"Amount of increase (decrease) in cash, cash equivalents, and cash and cash equivalents restricted to withdrawal or usage; including 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":"2018-01-01","end":"2018-03-31","val":4427000,"accn":"0000805022-19-000024","fy":2019,"fp":"Q1","form":"10-Q","filed":"2019-05-10","frame":"CY2018Q1"},{"start":"2018-01-01","end":"2018-06-30","val":-523000,"accn":"0000805022-19-000030","fy":2019,"fp":"Q2","form":"10-Q","filed":"2019-08-01"},{"start":"2018-01-01","end":"2018-09-30","val":-1519000,"accn":"0000805022-19-000039","fy":2019,"fp":"Q3","form":"10-Q","filed":"2019-11-01"},{"start":"2019-01-01","end":"2019-03-31","val":-314000,"accn":"0000805022-19-000024","fy":2019,"fp":"Q1","form":"10-Q","filed":"2019-05-10","frame":"CY2019Q1"},{"start":"2019-01-01","end":"2019-06-30","val":4461000,"accn":"0000805022-19-000030","fy":2019,"fp":"Q2","form":"10-Q","filed":"2019-08-01"},{"start":"2019-01-01","end":"2019-09-30","val":-432000,"accn":"0000805022-19-000039","fy":2019,"fp":"Q3","form":"10-Q","filed":"2019-11-01"}]}},"ChangeInUnrealizedGainLossOnFairValueHedgingInstruments":{"label":"Change in Unrealized 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before accumulated depletion of real estate held for productive use, excluding land held for sale.","units":{"USD":[{"end":"2010-12-31","val":64905000,"accn":"0001193125-12-082021","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-27","frame":"CY2010Q4I"},{"end":"2010-12-31","val":64905000,"accn":"0001193125-11-302227","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-08"},{"end":"2010-12-31","val":64905000,"accn":"0001193125-11-214434","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-08"},{"end":"2011-06-30","val":226211000,"accn":"0001193125-11-214434","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-08","frame":"CY2011Q2I"},{"end":"2011-09-30","val":226211000,"accn":"0001193125-11-302227","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-08","frame":"CY2011Q3I"},{"end":"2011-12-31","val":226750000,"accn":"0001193125-13-077232","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-26","frame":"CY2011Q4I"},{"end":"2011-12-31","val":226750000,"accn":"0001193125-12-082021","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-27"},{"end":"2012-12-31","val":301604000,"accn":"0001193125-13-077232","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-26","frame":"CY2012Q4I"}]}},"LeaseOperatingExpense":{"label":"Oil 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production.","units":{"USD":[{"start":"2009-01-01","end":"2009-12-31","val":7400000,"accn":"0001193125-12-082021","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-27","frame":"CY2009"},{"start":"2010-01-01","end":"2010-06-30","val":3600000,"accn":"0001193125-11-214434","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-08"},{"start":"2010-04-01","end":"2010-06-30","val":1800000,"accn":"0001193125-11-214434","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-08","frame":"CY2010Q2"},{"start":"2010-01-01","end":"2010-09-30","val":5400000,"accn":"0001193125-11-302227","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-08"},{"start":"2010-07-01","end":"2010-09-30","val":1800000,"accn":"0001193125-11-302227","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-08","frame":"CY2010Q3"},{"start":"2010-01-01","end":"2010-12-31","val":7100000,"accn":"0001193125-13-077232","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-26","frame":"CY2010"},{"start":"2010-01-01","end":"2010-12-31","val":7100000,"accn":"0001193125-12-082021","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-27"},{"start":"2011-01-01","end":"2011-06-30","val":3600000,"accn":"0001193125-11-214434","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-08"},{"start":"2011-04-01","end":"2011-06-30","val":1800000,"accn":"0001193125-11-214434","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-08","frame":"CY2011Q2"},{"start":"2011-01-01","end":"2011-09-30","val":5400000,"accn":"0001193125-11-302227","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-08"},{"start":"2011-07-01","end":"2011-09-30","val":1800000,"accn":"0001193125-11-302227","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-08","frame":"CY2011Q3"},{"start":"2011-01-01","end":"2011-12-31","val":7100000,"accn":"0001193125-13-077232","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-26","frame":"CY2011"},{"start":"2011-01-01","end":"2011-12-31","val":7100000,"accn":"0001193125-12-082021","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-27"},{"start":"2012-01-01","end":"2012-12-31","val":7100000,"accn":"0001193125-13-077232","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-26","frame":"CY2012"}]}},"LesseeOperatingLeaseLiabilityPaymentsDue":{"label":"Lessee, Operating Lease, Liability, to be Paid","description":"Amount of lessee's undiscounted obligation for lease payment for operating lease.","units":{"USD":[{"end":"2019-03-31","val":240375000,"accn":"0000805022-19-000024","fy":2019,"fp":"Q1","form":"10-Q","filed":"2019-05-10","frame":"CY2019Q1I"},{"end":"2019-06-30","val":238365000,"accn":"0000805022-19-000030","fy":2019,"fp":"Q2","form":"10-Q","filed":"2019-08-01","frame":"CY2019Q2I"},{"end":"2019-09-30","val":235664000,"accn":"0000805022-19-000039","fy":2019,"fp":"Q3","form":"10-Q","filed":"2019-11-01","frame":"CY2019Q3I"}]}},"LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive":{"label":"Lessee, Operating Lease, Liability, to be Paid, after Year Five","description":"Amount of lessee's undiscounted obligation for lease payment for operating lease due after fifth fiscal year following current fiscal year. 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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":"2019-03-31","val":18462000,"accn":"0000805022-19-000024","fy":2019,"fp":"Q1","form":"10-Q","filed":"2019-05-10","frame":"CY2019Q1I"},{"end":"2019-06-30","val":18541000,"accn":"0000805022-19-000030","fy":2019,"fp":"Q2","form":"10-Q","filed":"2019-08-01","frame":"CY2019Q2I"},{"end":"2019-09-30","val":19231000,"accn":"0000805022-19-000039","fy":2019,"fp":"Q3","form":"10-Q","filed":"2019-11-01","frame":"CY2019Q3I"}]}},"LesseeOperatingLeaseLiabilityPaymentsDueYearFour":{"label":"Lessee, Operating Lease, Liability, to be Paid, Year Four","description":"Amount of lessee's undiscounted obligation for lease payment for operating lease to be paid in fourth fiscal year following current fiscal year. 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