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An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees.","units":{"USD":[{"end":"2010-12-31","val":74000000,"accn":"0001135361-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-04-01","frame":"CY2010Q4I"},{"end":"2011-12-31","val":71000000,"accn":"0001135361-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-04-01"},{"end":"2011-12-31","val":61000000,"accn":"0001135361-14-000005","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-28","frame":"CY2011Q4I"},{"end":"2012-12-31","val":69000000,"accn":"0001135361-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-04-01"},{"end":"2012-12-31","val":59000000,"accn":"0001135361-13-000006","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-15"},{"end":"2012-12-31","val":59000000,"accn":"0001135361-13-000009","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-15"},{"end":"2012-12-31","val":59000000,"accn":"0001135361-13-000012","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-12"},{"end":"2012-12-31","val":59000000,"accn":"0001135361-14-000005","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-28"},{"end":"2012-12-31","val":59000000,"accn":"0001135361-15-000004","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-24","frame":"CY2012Q4I"},{"end":"2013-03-31","val":66000000,"accn":"0001135361-13-000006","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-15","frame":"CY2013Q1I"},{"end":"2013-06-30","val":67000000,"accn":"0001135361-13-000009","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-15","frame":"CY2013Q2I"},{"end":"2013-09-30","val":68000000,"accn":"0001135361-13-000012","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-12","frame":"CY2013Q3I"},{"end":"2013-12-31","val":43000000,"accn":"0001135361-14-000005","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-28"},{"end":"2013-12-31","val":43000000,"accn":"0001135361-15-000004","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-24"},{"end":"2013-12-31","val":43000000,"accn":"0001135361-16-000019","fy":2015,"fp":"FY","form":"10-K","filed":"2016-03-29","frame":"CY2013Q4I"},{"end":"2014-12-31","val":90000000,"accn":"0001135361-15-000004","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-24"},{"end":"2014-12-31","val":90000000,"accn":"0001135361-16-000019","fy":2015,"fp":"FY","form":"10-K","filed":"2016-03-29","frame":"CY2014Q4I"},{"end":"2015-12-31","val":49000000,"accn":"0001135361-16-000019","fy":2015,"fp":"FY","form":"10-K","filed":"2016-03-29","frame":"CY2015Q4I"}]}},"AssetRetirementObligationAccretionExpense":{"label":"Asset Retirement Obligation, Accretion Expense","description":"Amount of accretion expense recognized during the period that is associated with an asset retirement obligation. 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