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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":"2012-06-30","val":51000000,"accn":"0001445049-12-000011","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-07-31","frame":"CY2012Q2I"},{"end":"2012-09-30","val":48000000,"accn":"0001445049-12-000014","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-10-30","frame":"CY2012Q3I"},{"end":"2012-12-31","val":84000000,"accn":"0001445049-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-19","frame":"CY2012Q4I"},{"end":"2013-03-31","val":76000000,"accn":"0001445049-13-000009","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-02","frame":"CY2013Q1I"},{"end":"2013-06-30","val":68000000,"accn":"0001445049-13-000016","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-02","frame":"CY2013Q2I"},{"end":"2013-09-30","val":60000000,"accn":"0001445049-13-000021","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-01","frame":"CY2013Q3I"},{"end":"2013-12-31","val":84000000,"accn":"0001445049-14-000007","fy":2013,"fp":"FY","form":"10-K","filed":"2014-04-30","frame":"CY2013Q4I"},{"end":"2014-03-31","val":66000000,"accn":"0001445049-14-000011","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-07","frame":"CY2014Q1I"},{"end":"2014-06-30","val":49000000,"accn":"0001445049-14-000015","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-01","frame":"CY2014Q2I"},{"end":"2014-09-30","val":33000000,"accn":"0001445049-14-000018","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-04","frame":"CY2014Q3I"},{"end":"2014-12-31","val":54000000,"accn":"0001445049-15-000003","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-31","frame":"CY2014Q4I"},{"end":"2015-03-31","val":58000000,"accn":"0001445049-15-000006","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-07","frame":"CY2015Q1I"},{"end":"2015-06-30","val":61000000,"accn":"0001445049-15-000009","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-03","frame":"CY2015Q2I"},{"end":"2015-09-30","val":65000000,"accn":"0001445049-15-000013","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-03","frame":"CY2015Q3I"},{"end":"2015-12-31","val":66000000,"accn":"0001445049-16-000016","fy":2015,"fp":"FY","form":"10-K","filed":"2016-03-01","frame":"CY2015Q4I"},{"end":"2016-03-31","val":60000000,"accn":"0001445049-16-000019","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-05-09","frame":"CY2016Q1I"},{"end":"2016-06-30","val":56000000,"accn":"0001445049-16-000022","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-02","frame":"CY2016Q2I"}]}},"AssetRetirementObligationLiabilitiesIncurred":{"label":"Asset Retirement Obligation, Liabilities Incurred","description":"Amount of asset retirement obligations incurred during the period.","units":{"USD":[{"start":"2010-12-31","end":"2011-12-31","val":67000000,"accn":"0001445049-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-19","frame":"CY2011"},{"start":"2012-01-01","end":"2012-12-31","val":36000000,"accn":"0001445049-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-19"},{"start":"2012-01-01","end":"2012-12-31","val":36000000,"accn":"0001445049-14-000007","fy":2013,"fp":"FY","form":"10-K","filed":"2014-04-30","frame":"CY2012"},{"start":"2013-01-01","end":"2013-12-31","val":20000000,"accn":"0001445049-14-000007","fy":2013,"fp":"FY","form":"10-K","filed":"2014-04-30"},{"start":"2013-01-01","end":"2013-12-31","val":20000000,"accn":"0001445049-15-000003","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-31","frame":"CY2013"},{"start":"2014-01-01","end":"2014-12-31","val":127000000,"accn":"0001445049-15-000003","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-31"},{"start":"2014-01-01","end":"2014-12-31","val":127000000,"accn":"0001445049-16-000016","fy":2015,"fp":"FY","form":"10-K","filed":"2016-03-01","frame":"CY2014"},{"start":"2015-01-01","end":"2015-06-30","val":54000000,"accn":"0001445049-15-000009","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-03"},{"start":"2015-01-01","end":"2015-09-30","val":59000000,"accn":"0001445049-15-000013","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-03"},{"start":"2015-01-01","end":"2015-12-31","val":153000000,"accn":"0001445049-16-000016","fy":2015,"fp":"FY","form":"10-K","filed":"2016-03-01","frame":"CY2015"},{"start":"2016-01-01","end":"2016-03-31","val":17000000,"accn":"0001445049-16-000019","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-05-09","frame":"CY2016Q1"},{"start":"2016-01-01","end":"2016-06-30","val":26000000,"accn":"0001445049-16-000022","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-02"}]}},"AssetRetirementObligationLiabilitiesSettled":{"label":"Asset Retirement Obligation, Liabilities Settled","description":"Amount of asset retirement obligations settled, or otherwise disposed of, during the period. 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