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Condensed Consolidated Statements Of Comprehensive Income (Parenthetical) (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Available-for-Sale Securities, tax $ 5 $ 59 $ (16) $ 76
Change in Fair Value of Derivative Instruments, tax 1 (9) (10) (8)
Reclassification Adjustments for Net Amounts included in Net Income, tax 7 25 24 62
Pension/OPEB adjustment, tax (5) (4) (16) (34)
Power [Member]
       
Available-for-Sale Securities, tax 6 58 (16) 77
Change in Fair Value of Derivative Instruments, tax 1 (9) (10) (8)
Reclassification Adjustments for Net Amounts included in Net Income, tax 7 25 24 62
Pension/OPEB adjustment, tax (4) (3) (14) (31)
PSE And G [Member]
       
Available-for-Sale Securities, tax $ (1) $ 0 $ 0 $ (1)