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Cash and cash equivalents are the amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes 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. Includes effect from exchange rate changes.","units":{"USD":[{"start":"2007-01-01","end":"2007-12-31","val":-1386000000,"accn":"0001193125-10-042898","fy":2009,"fp":"FY","form":"10-K","filed":"2010-02-26","frame":"CY2007"},{"start":"2008-01-01","end":"2008-06-30","val":71000000,"accn":"0001140361-09-019899","fy":2009,"fp":"Q2","form":"10-Q/A","filed":"2009-08-28"},{"start":"2008-01-01","end":"2008-09-30","val":280000000,"accn":"0000101778-09-000123","fy":2009,"fp":"Q3","form":"10-Q","filed":"2009-11-06"},{"start":"2008-01-01","end":"2008-12-31","val":86000000,"accn":"0001193125-10-042898","fy":2009,"fp":"FY","form":"10-K","filed":"2010-02-26"},{"start":"2008-01-01","end":"2008-12-31","val":86000000,"accn":"0001193125-11-047891","fy":2010,"fp":"FY","form":"10-K","filed":"2011-02-28","frame":"CY2008"},{"start":"2009-01-01","end":"2009-03-31","val":584000000,"accn":"0000101778-10-000027","fy":2010,"fp":"Q1","form":"10-Q","filed":"2010-05-10","frame":"CY2009Q1"},{"start":"2009-01-01","end":"2009-06-30","val":211000000,"accn":"0001140361-09-019899","fy":2009,"fp":"Q2","form":"10-Q/A","filed":"2009-08-28"},{"start":"2009-01-01","end":"2009-06-30","val":211000000,"accn":"0000101778-10-000054","fy":2010,"fp":"Q2","form":"10-Q/A","filed":"2010-09-02"},{"start":"2009-01-01","end":"2009-09-30","val":85000000,"accn":"0000101778-09-000123","fy":2009,"fp":"Q3","form":"10-Q","filed":"2009-11-06"},{"start":"2009-01-01","end":"2009-09-30","val":85000000,"accn":"0000101778-10-000077","fy":2010,"fp":"Q3","form":"10-Q","filed":"2010-11-08"},{"start":"2009-01-01","end":"2009-12-31","val":772000000,"accn":"0001193125-10-042898","fy":2009,"fp":"FY","form":"10-K","filed":"2010-02-26"},{"start":"2009-01-01","end":"2009-12-31","val":772000000,"accn":"0001193125-11-047891","fy":2010,"fp":"FY","form":"10-K","filed":"2011-02-28"},{"start":"2009-01-01","end":"2009-12-31","val":772000000,"accn":"0001193125-12-088742","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-29","frame":"CY2009"},{"start":"2010-01-01","end":"2010-03-31","val":661000000,"accn":"0000101778-10-000027","fy":2010,"fp":"Q1","form":"10-Q","filed":"2010-05-10"},{"start":"2010-01-01","end":"2010-03-31","val":661000000,"accn":"0000101778-11-000020","fy":2011,"fp":"Q1","form":"10-Q","filed":"2011-05-06","frame":"CY2010Q1"},{"start":"2010-01-01","end":"2010-06-30","val":5000000,"accn":"0000101778-10-000054","fy":2010,"fp":"Q2","form":"10-Q/A","filed":"2010-09-02"},{"start":"2010-01-01","end":"2010-06-30","val":5000000,"accn":"0000101778-11-000048","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-08"},{"start":"2010-01-01","end":"2010-09-30","val":-414000000,"accn":"0000101778-10-000077","fy":2010,"fp":"Q3","form":"10-Q","filed":"2010-11-08"},{"start":"2010-01-01","end":"2010-09-30","val":-414000000,"accn":"0000101778-11-000073","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-04"},{"start":"2010-01-01","end":"2010-12-31","val":1894000000,"accn":"0001193125-11-047891","fy":2010,"fp":"FY","form":"10-K","filed":"2011-02-28"},{"start":"2010-01-01","end":"2010-12-31","val":1894000000,"accn":"0001193125-12-088742","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-29"},{"start":"2010-01-01","end":"2010-12-31","val":1894000000,"accn":"0000101778-13-000006","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2010"},{"start":"2011-01-01","end":"2011-03-31","val":1765000000,"accn":"0000101778-11-000020","fy":2011,"fp":"Q1","form":"10-Q","filed":"2011-05-06"},{"start":"2011-01-01","end":"2011-03-31","val":1765000000,"accn":"0000101778-12-000020","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-04","frame":"CY2011Q1"},{"start":"2011-01-01","end":"2011-06-30","val":760000000,"accn":"0000101778-11-000048","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-08"},{"start":"2011-01-01","end":"2011-06-30","val":760000000,"accn":"0001140361-12-035104","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-03"},{"start":"2011-01-01","end":"2011-09-30","val":682000000,"accn":"0000101778-11-000073","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-04"},{"start":"2011-01-01","end":"2011-09-30","val":682000000,"accn":"0000101778-12-000029","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-07"},{"start":"2011-01-01","end":"2011-12-31","val":-3458000000,"accn":"0001193125-12-088742","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-29"},{"start":"2011-01-01","end":"2011-12-31","val":-3458000000,"accn":"0000101778-13-000006","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"start":"2011-01-01","end":"2011-12-31","val":-3458000000,"accn":"0000101778-14-000014","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-28","frame":"CY2011"},{"start":"2012-01-01","end":"2012-03-31","val":20000000,"accn":"0000101778-12-000020","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-04"},{"start":"2012-01-01","end":"2012-03-31","val":20000000,"accn":"0000101778-13-000019","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-10","frame":"CY2012Q1"},{"start":"2012-01-01","end":"2012-06-30","val":-41000000,"accn":"0001140361-12-035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Cash Equivalents, Restricted Cash and Restricted Cash Equivalents","description":"Amount of cash and cash equivalents, and cash and cash equivalents restricted to withdrawal or usage. 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Expense","description":"\"Exploration expenses (including prospecting) related to oil and gas producing entities and would be included in operating expenses of that entity. 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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Notional amount refers to the number of currency units specified in the foreign currency derivative contract.","units":{"NOK":[{"end":"2012-03-31","val":3954000000,"accn":"0000101778-12-000020","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-04","frame":"CY2012Q1I"},{"end":"2012-06-30","val":3310000000,"accn":"0001140361-12-035104","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-03","frame":"CY2012Q2I"},{"end":"2012-09-30","val":3939000000,"accn":"0000101778-12-000029","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-07","frame":"CY2012Q3I"},{"end":"2012-12-31","val":3043000000,"accn":"0000101778-13-000019","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-10","frame":"CY2012Q4I"},{"end":"2012-12-31","val":3043000000,"accn":"0000101778-13-000006","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"end":"2013-03-31","val":3571000000,"accn":"0000101778-13-000019","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-10","frame":"CY2013Q1I"}],"USD":[{"end":"2009-12-31","val":3000000,"accn":"0001193125-11-047891","fy":2010,"fp":"FY","form":"10-K","filed":"2011-02-28","frame":"CY2009Q4I"},{"end":"2011-09-30","val":0,"accn":"0000101778-11-000073","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-04","frame":"CY2011Q3I"},{"end":"2012-12-31","val":5.78,"accn":"0000101778-13-000006","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2012Q4I"}]}},"NotionalAmountOfInterestRateDerivatives":{"label":"Notional Amount of Interest Rate Derivatives (Deprecated 2013-01-31)","description":"Aggregate notional amount of interest rate derivatives, which relates to the currency amount specified in the interest rate derivative instruments.","units":{"USD":[{"end":"2010-12-31","val":1450000000,"accn":"0000101778-11-000073","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-04","frame":"CY2010Q4I"},{"end":"2010-12-31","val":1450000000,"accn":"0000101778-11-000048","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-08"},{"end":"2010-12-31","val":1450000000,"accn":"0000101778-11-000020","fy":2011,"fp":"Q1","form":"10-Q","filed":"2011-05-06"},{"end":"2011-03-31","val":200000000,"accn":"0000101778-11-000020","fy":2011,"fp":"Q1","form":"10-Q","filed":"2011-05-06","frame":"CY2011Q1I"},{"end":"2011-06-30","val":500000000,"accn":"0000101778-11-000048","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-08","frame":"CY2011Q2I"},{"end":"2011-09-30","val":500000000,"accn":"0000101778-11-000073","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-04","frame":"CY2011Q3I"}]}},"NotionalAmountOfInterestRateFairValueHedgeDerivatives":{"label":"Notional Amount of Interest Rate Fair Value Hedge Derivatives (Deprecated 2013-01-31)","description":"Aggregate notional amount of all interest rate derivatives designated as hedging instruments in fair value hedges. 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This item includes treasury stock repurchased by the entity. 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Alternate caption for the concept is permanent 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