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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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(Decrease) in Regulatory Assets and Liabilities","description":"The increase (decrease) during the reporting period in the value of assets that are created when regulatory agencies permits public utilities to defer costs (revenues) to the balance sheet. This element is a the increase (decrease) of regulatory assets and liabilities combined.","units":{"USD":[{"start":"2007-01-01","end":"2007-12-31","val":81000000,"accn":"0001130310-10-000006","fy":2009,"fp":"FY","form":"10-K","filed":"2010-02-26","frame":"CY2007"},{"start":"2008-01-01","end":"2008-06-30","val":14000000,"accn":"0001130310-09-000035","fy":2009,"fp":"Q2","form":"10-Q","filed":"2009-08-05"},{"start":"2008-01-01","end":"2008-09-30","val":-48000000,"accn":"0001130310-09-000049","fy":2009,"fp":"Q3","form":"10-Q","filed":"2009-10-28"},{"start":"2008-01-01","end":"2008-12-31","val":-366000000,"accn":"0001130310-10-000006","fy":2009,"fp":"FY","form":"10-K","filed":"2010-02-26"},{"start":"2008-01-01","end":"2008-12-31","val":-366000000,"accn":"0001130310-11-000020","fy":2010,"fp":"FY","form":"10-K/A","filed":"2011-03-30","frame":"CY2008"},{"start":"2009-01-01","end":"2009-03-31","val":21000000,"accn":"0001130310-10-000021","fy":2010,"fp":"Q1","form":"10-Q","filed":"2010-05-05","frame":"CY2009Q1"},{"start":"2009-01-01","end":"2009-06-30","val":19000000,"accn":"0001130310-09-000035","fy":2009,"fp":"Q2","form":"10-Q","filed":"2009-08-05"},{"start":"2009-01-01","end":"2009-06-30","val":19000000,"accn":"0001130310-10-000036","fy":2010,"fp":"Q2","form":"10-Q","filed":"2010-08-04"},{"start":"2009-01-01","end":"2009-09-30","val":19000000,"accn":"0001130310-09-000049","fy":2009,"fp":"Q3","form":"10-Q","filed":"2009-10-28"},{"start":"2009-01-01","end":"2009-09-30","val":19000000,"accn":"0001130310-10-000048","fy":2010,"fp":"Q3","form":"10-Q","filed":"2010-10-28"},{"start":"2009-01-01","end":"2009-12-31","val":0,"accn":"0001130310-10-000006","fy":2009,"fp":"FY","form":"10-K","filed":"2010-02-26"},{"start":"2009-01-01","end":"2009-12-31","val":0,"accn":"0001130310-11-000020","fy":2010,"fp":"FY","form":"10-K/A","filed":"2011-03-30"},{"start":"2009-01-01","end":"2009-12-31","val":0,"accn":"0001130310-12-000011","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-29","frame":"CY2009"},{"start":"2010-01-01","end":"2010-03-31","val":19000000,"accn":"0001130310-10-000021","fy":2010,"fp":"Q1","form":"10-Q","filed":"2010-05-05"},{"start":"2010-01-01","end":"2010-03-31","val":-19000000,"accn":"0001130310-11-000027","fy":2011,"fp":"Q1","form":"10-Q","filed":"2011-05-05","frame":"CY2010Q1"},{"start":"2010-01-01","end":"2010-06-30","val":26000000,"accn":"0001130310-10-000036","fy":2010,"fp":"Q2","form":"10-Q","filed":"2010-08-04"},{"start":"2010-01-01","end":"2010-06-30","val":-26000000,"accn":"0001130310-11-000047","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-04"},{"start":"2010-01-01","end":"2010-09-30","val":23000000,"accn":"0001130310-10-000048","fy":2010,"fp":"Q3","form":"10-Q","filed":"2010-10-28"},{"start":"2010-01-01","end":"2010-09-30","val":-23000000,"accn":"0001130310-11-000061","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-02"},{"start":"2010-01-01","end":"2010-12-31","val":14000000,"accn":"0001130310-11-000020","fy":2010,"fp":"FY","form":"10-K/A","filed":"2011-03-30"},{"start":"2010-01-01","end":"2010-12-31","val":-14000000,"accn":"0001130310-12-000011","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-29"},{"start":"2010-01-01","end":"2010-12-31","val":-14000000,"accn":"0001130310-13-000006","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-27","frame":"CY2010"},{"start":"2011-01-01","end":"2011-03-31","val":-17000000,"accn":"0001130310-11-000027","fy":2011,"fp":"Q1","form":"10-Q","filed":"2011-05-05"},{"start":"2011-01-01","end":"2011-03-31","val":-17000000,"accn":"0001130310-12-000020","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-03","frame":"CY2011Q1"},{"start":"2011-01-01","end":"2011-06-30","val":-15000000,"accn":"0001130310-11-000047","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-04"},{"start":"2011-01-01","end":"2011-06-30","val":-15000000,"accn":"0001130310-12-000027","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-02"},{"start":"2011-01-01","end":"2011-09-30","val":-22000000,"accn":"0001130310-11-000061","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-02"},{"start":"2011-01-01","end":"2011-09-30","val":-22000000,"accn":"0001130310-12-000033","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-07"},{"start":"2011-01-01","end":"2011-12-31","val":-31000000,"accn":"0001130310-12-000011","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-29"},{"start":"2011-01-01","end":"2011-12-31","val":-31000000,"accn":"0001130310-13-000006","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-27"},{"start":"2011-01-01","end":"2011-12-31","val":-31000000,"accn":"0001130310-14-000005","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-26","frame":"CY2011"},{"start":"2012-01-01","end":"2012-03-31","val":-42000000,"accn":"0001130310-12-000020","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-03"},{"start":"2012-01-01","end":"2012-03-31","val":-42000000,"accn":"0001130310-13-000012","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-02","frame":"CY2012Q1"},{"start":"2012-01-01","end":"2012-06-30","val":-55000000,"accn":"0001130310-12-000027","fy":2012,"fp":"Q2","form":"10-Q"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