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Includes adjustments to additional paid in capital. Some examples of such adjustments include recording the issuance of debt with a beneficial conversion feature and certain tax consequences of equity instruments awarded to employees. Use this element for the aggregate amount of additional paid-in capital associated with common and preferred stock. For additional paid-in capital associated with only common stock, use the element additional paid in capital, common stock. For additional paid-in capital associated with only preferred stock, use the element additional paid in capital, preferred stock.","units":{"USD":[{"end":"2008-12-31","val":5696000000,"accn":"0001193125-10-037173","fy":2009,"fp":"FY","form":"10-K","filed":"2010-02-23","frame":"CY2008Q4I"},{"end":"2008-12-31","val":5696000000,"accn":"0001193125-09-221564","fy":2009,"fp":"Q3","form":"10-Q","filed":"2009-11-03"},{"end":"2008-12-31","val":5696000000,"accn":"0001193125-09-163299","fy":2009,"fp":"Q2","form":"10-Q","filed":"2009-08-04"},{"end":"2009-06-30","val":7123000000,"accn":"0001193125-09-163299","fy":2009,"fp":"Q2","form":"10-Q","filed":"2009-08-04","frame":"CY2009Q2I"},{"end":"2009-09-30","val":7184000000,"accn":"0001193125-09-221564","fy":2009,"fp":"Q3","form":"10-Q","filed":"2009-11-03","frame":"CY2009Q3I"},{"end":"2009-12-31","val":7243000000,"accn":"0001193125-11-043021","fy":2010,"fp":"FY","form":"10-K","filed":"2011-02-23","frame":"CY2009Q4I"},{"end":"2009-12-31","val":7243000000,"accn":"0001193125-10-242664","fy":2010,"fp":"Q3","form":"10-Q","filed":"2010-11-01"},{"end":"2009-12-31","val":7243000000,"accn":"0001193125-10-194985","fy":2010,"fp":"Q2","form":"10-Q/A","filed":"2010-08-23"},{"end":"2009-12-31","val":7243000000,"accn":"0001193125-10-105970","fy":2010,"fp":"Q1","form":"10-Q","filed":"2010-05-04"},{"end":"2009-12-31","val":7243000000,"accn":"0001193125-10-037173","fy":2009,"fp":"FY","form":"10-K","filed":"2010-02-23"},{"end":"2010-03-31","val":7348000000,"accn":"0001193125-10-105970","fy":2010,"fp":"Q1","form":"10-Q","filed":"2010-05-04","frame":"CY2010Q1I"},{"end":"2010-06-30","val":7407000000,"accn":"0001193125-10-194985","fy":2010,"fp":"Q2","form":"10-Q/A","filed":"2010-08-23","frame":"CY2010Q2I"},{"end":"2010-09-30","val":7445000000,"accn":"0001193125-10-242664","fy":2010,"fp":"Q3","form":"10-Q","filed":"2010-11-01","frame":"CY2010Q3I"},{"end":"2010-12-31","val":7496000000,"accn":"0001193125-11-121736","fy":2011,"fp":"Q1","form":"10-Q","filed":"2011-05-02","frame":"CY2010Q4I"},{"end":"2010-12-31","val":7496000000,"accn":"0001193125-11-043021","fy":2010,"fp":"FY","form":"10-K","filed":"2011-02-23"},{"end":"2011-03-31","val":7564000000,"accn":"0001193125-11-121736","fy":2011,"fp":"Q1","form":"10-Q","filed":"2011-05-02","frame":"CY2011Q1I"}]}},"AdditionalPaidInCapitalCommonStock":{"label":"Additional Paid in Capital, Common Stock","description":"Value received from shareholders in common stock-related transactions that are in excess of par value or stated value and amounts received from other stock-related transactions. 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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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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":{"MMboe":[{"end":"2007-12-31","val":1625,"accn":"0001193125-11-043021","fy":2010,"fp":"FY","form":"10-K","filed":"2011-02-23","frame":"CY2007Q4I"},{"end":"2008-12-31","val":1600,"accn":"0001193125-11-043021","fy":2010,"fp":"FY","form":"10-K","filed":"2011-02-23","frame":"CY2008Q4I"},{"end":"2009-12-31","val":1624,"accn":"0001193125-11-043021","fy":2010,"fp":"FY","form":"10-K","filed":"2011-02-23","frame":"CY2009Q4I"},{"end":"2010-12-31","val":1673,"accn":"0001193125-11-043021","fy":2010,"fp":"FY","form":"10-K","filed":"2011-02-23","frame":"CY2010Q4I"}]}},"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. 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Amount excludes temporary equity. 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