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Cash Equivalents, and Short-term Investments","description":"Cash includes currency on hand as well as demand deposits with banks or financial institutions. It also includes other kinds of accounts that have the general characteristics of demand deposits in that the customer may deposit additional funds at any time and effectively may withdraw funds at any time without prior notice or penalty. Cash equivalents, excluding items classified as marketable securities, include short-term, highly liquid Investments that are both readily convertible to known amounts of cash, and so near their maturity that they present minimal risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three years ago does not become a cash equivalent when its remaining maturity is three months. Short-term investments, exclusive of cash equivalents, generally consist of marketable securities intended to be sold within one year (or the normal operating cycle if longer) and may include trading securities, available-for-sale securities, or held-to-maturity securities (if maturing within one year), as 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This item includes treasury stock repurchased by the entity. Note: elements for number of nonredeemable common shares, par value and other disclosure concepts are in another section within stockholders' 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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: 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. Exploration costs also include costs of carrying and retaining undeveloped properties, such as delay rentals, ad valorem taxes on properties, legal costs for title defense, the maintenance of land and lease records, dry hole contributions and bottom hole contributions, costs of drilling and equipping exploratory wells and costs of drilling exploratory-type stratigraphic test 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Discoveries, Additions and Improved Recovery, Less Related Costs","description":"Amount of increase (decrease) in standardized measure of discounted future net cash flow as a result of extensions, discoveries and improved recovery of proved oil and gas reserves.","units":{"USD":[{"start":"2008-10-01","end":"2009-09-30","val":66002000,"accn":"0001193125-11-321222","fy":2011,"fp":"FY","form":"10-K","filed":"2011-11-23","frame":"CY2009"},{"start":"2009-10-01","end":"2010-09-30","val":329555000,"accn":"0001193125-11-321222","fy":2011,"fp":"FY","form":"10-K","filed":"2011-11-23"},{"start":"2009-10-01","end":"2010-09-30","val":329555000,"accn":"0001193125-12-478803","fy":2012,"fp":"FY","form":"10-K","filed":"2012-11-21","frame":"CY2010"},{"start":"2010-10-01","end":"2011-09-30","val":218140000,"accn":"0001193125-11-321222","fy":2011,"fp":"FY","form":"10-K","filed":"2011-11-23"},{"start":"2010-10-01","end":"2011-09-30","val":218140000,"accn":"0001193125-12-478803","fy":2012,"fp":"FY","form":"10-K","filed":"2012-11-21"},{"start":"2010-10-01","end":"2011-09-30","val":218140000,"accn":"0001193125-13-451068","fy":2013,"fp":"FY","form":"10-K","filed":"2013-11-22","frame":"CY2011"},{"start":"2011-10-01","end":"2012-09-30","val":224474000,"accn":"0001193125-12-478803","fy":2012,"fp":"FY","form":"10-K","filed":"2012-11-21"},{"start":"2011-10-01","end":"2012-09-30","val":224474000,"accn":"0001193125-13-451068","fy":2013,"fp":"FY","form":"10-K","filed":"2013-11-22"},{"start":"2011-10-01","end":"2012-09-30","val":224474000,"accn":"0000070145-14-000095","fy":2014,"fp":"FY","form":"10-K","filed":"2014-11-21","frame":"CY2012"},{"start":"2012-10-01","end":"2013-09-30","val":390255000,"accn":"0001193125-13-451068","fy":2013,"fp":"FY","form":"10-K","filed":"2013-11-22"},{"start":"2012-10-01","end":"2013-09-30","val":390255000,"accn":"0000070145-14-000095","fy":2014,"fp":"FY","form":"10-K","filed":"2014-11-21"},{"start":"2012-10-01","end":"2013-09-30","val":390255000,"accn":"0000070145-15-000066","fy":2015,"fp":"FY","form":"10-K","filed":"2015-11-20","frame":"CY2013"},{"start":"2013-10-01","end":"2014-09-30","val":381008000,"accn":"0000070145-14-000095","fy":2014,"fp":"FY","form":"10-K","filed":"2014-11-21"},{"start":"2013-10-01","end":"2014-09-30","val":381008000,"accn":"0000070145-15-000066","fy":2015,"fp":"FY","form":"10-K","filed":"2015-11-20"},{"start":"2013-10-01","end":"2014-09-30","val":381008000,"accn":"0000070145-16-000173","fy":2016,"fp":"FY","form":"10-K","filed":"2016-11-18","frame":"CY2014"},{"start":"2014-10-01","end":"2015-09-30","val":266159000,"accn":"0000070145-15-000066","fy":2015,"fp":"FY","form":"10-K","filed":"2015-11-20"},{"start":"2014-10-01","end":"2015-09-30","val":266159000,"accn":"0000070145-16-000173","fy":2016,"fp":"FY","form":"10-K","filed":"2016-11-18"},{"start":"2014-10-01","end":"2015-09-30","val":266159000,"accn":"0000070145-17-000054","fy":2017,"fp":"FY","form":"10-K","filed":"2017-11-17","frame":"CY2015"},{"start":"2015-10-01","end":"2016-09-30","val":47742000,"accn":"0000070145-16-000173","fy":2016,"fp":"FY","form":"10-K","filed":"2016-11-18"},{"start":"2015-10-01","end":"2016-09-30","val":47742000,"accn":"0000070145-17-000054","fy":2017,"fp":"FY","form":"10-K","filed":"2017-11-17","frame":"CY2016"},{"start":"2016-10-01","end":"2017-09-30","val":170500000,"accn":"0000070145-17-000054","fy":2017,"fp":"FY","form":"10-K","filed":"2017-11-17","frame":"CY2017"}]}},"FairValueAssetsLevel1ToLevel2TransfersAmount":{"label":"Fair 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2.","units":{"USD":[{"end":"2012-09-30","val":13000000,"accn":"0001193125-13-451068","fy":2013,"fp":"FY","form":"10-K","filed":"2013-11-22","frame":"CY2012Q3I"},{"end":"2013-09-30","val":0,"accn":"0001193125-13-451068","fy":2013,"fp":"FY","form":"10-K","filed":"2013-11-22"},{"end":"2013-09-30","val":0,"accn":"0000070145-14-000095","fy":2014,"fp":"FY","form":"10-K","filed":"2014-11-21","frame":"CY2013Q3I"},{"end":"2014-09-30","val":0,"accn":"0000070145-15-000066","fy":2015,"fp":"FY","form":"10-K","filed":"2015-11-20","frame":"CY2014Q3I"},{"end":"2014-09-30","val":0,"accn":"0000070145-14-000095","fy":2014,"fp":"FY","form":"10-K","filed":"2014-11-21"},{"end":"2015-09-30","val":0,"accn":"0000070145-16-000173","fy":2016,"fp":"FY","form":"10-K","filed":"2016-11-18","frame":"CY2015Q3I"},{"end":"2015-09-30","val":0,"accn":"0000070145-15-000066","fy":2015,"fp":"FY","form":"10-K","filed":"2015-11-20"},{"end":"2016-09-30","val":0,"accn":"0000070145-17-000054","fy":2017,"fp":"FY","form":"10-K","filed":"2017-11-17","frame":"CY2016Q3I"},{"end":"2016-09-30","val":0,"accn":"0000070145-16-000173","fy":2016,"fp":"FY","form":"10-K","filed":"2016-11-18"},{"end":"2017-09-30","val":0,"accn":"0000070145-18-000022","fy":2018,"fp":"FY","form":"10-K","filed":"2018-11-16","frame":"CY2017Q3I"},{"end":"2017-09-30","val":0,"accn":"0000070145-17-000054","fy":2017,"fp":"FY","form":"10-K","filed":"2017-11-17"},{"end":"2018-09-30","val":0,"accn":"0000070145-19-000030","fy":2019,"fp":"FY","form":"10-K","filed":"2019-11-15","frame":"CY2018Q3I"},{"end":"2018-09-30","val":0,"accn":"0000070145-18-000022","fy":2018,"fp":"FY","form":"10-K","filed":"2018-11-16"},{"end":"2019-09-30","val":0,"accn":"0000070145-20-000032","fy":2020,"fp":"FY","form":"10-K","filed":"2020-11-20","frame":"CY2019Q3I"},{"end":"2019-09-30","val":0,"accn":"0000070145-19-000030","fy":2019,"fp":"FY","form":"10-K","filed":"2019-11-15"},{"end":"2020-09-30","val":0,"accn":"0000070145-21-000030","fy":2021,"fp":"FY","form":"10-K","filed":"2021-11-19","frame":"CY2020Q3I"},{"end":"2020-09-30","val":0,"accn":"0000070145-20-000032","fy":2020,"fp":"FY","form":"10-K","filed":"2020-11-20"},{"end":"2021-09-30","val":0,"accn":"0000070145-21-000030","fy":2021,"fp":"FY","form":"10-K","filed":"2021-11-19","frame":"CY2021Q3I"}]}},"FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1":{"label":"Fair 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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":{"MMcf":[{"end":"2008-09-30","val":202519,"accn":"0001193125-11-321222","fy":2011,"fp":"FY","form":"10-K","filed":"2011-11-23","frame":"CY2008Q3I"},{"end":"2009-09-30","val":206233,"accn":"0001193125-11-321222","fy":2011,"fp":"FY","form":"10-K","filed":"2011-11-23","frame":"CY2009Q3I"},{"end":"2010-09-30","val":296288,"accn":"0001193125-11-321222","fy":2011,"fp":"FY","form":"10-K","filed":"2011-11-23","frame":"CY2010Q3I"},{"end":"2011-09-30","val":414423,"accn":"0001193125-11-321222","fy":2011,"fp":"FY","form":"10-K","filed":"2011-11-23","frame":"CY2011Q3I"}]}},"ProvedUndevelopedReservesVolume":{"label":"Proved Undeveloped Reserves (Volume) (Deprecated 2011-01-31)","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 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":{"cf":[{"start":"2008-10-01","end":"2009-09-30","val":87000000000,"accn":"0001193125-11-321222","fy":2011,"fp":"FY","form":"10-K","filed":"2011-11-23","frame":"CY2009"},{"start":"2009-10-01","end":"2010-09-30","val":177000000000,"accn":"0001193125-11-321222","fy":2011,"fp":"FY","form":"10-K","filed":"2011-11-23","frame":"CY2010"},{"start":"2010-10-01","end":"2011-09-30","val":295000000000,"accn":"0001193125-11-321222","fy":2011,"fp":"FY","form":"10-K","filed":"2011-11-23","frame":"CY2011"}]}},"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 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sEmployeeBenefitPlan":{"label":"Stock 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They become part of the cost of oil and gas produced. Examples of production costs (sometimes called lifting costs) are: costs of labor to operate the wells and related equipment and facilities; repairs and maintenance; materials, supplies, and fuel consumed and supplies utilized in operating the wells and related equipment and facilities; property taxes and insurance applicable to proved properties and wells and related equipment and facilities; severance taxes; some support equipment or facilities may serve two or more oil and gas producing activities and may also serve transportation, refining, and marketing activities. To the extent that the support equipment and facilities are used in oil and gas producing activities, their depreciation and applicable operating costs become exploration, development or production costs, as appropriate. 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