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Accumulated Other Comprehensive Income (Loss), Net of Tax (Reclassifications of AOCI) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Mar. 31, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Reclassification out of Accumulated Other Comprehensive Income [Line Items]          
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax $ (12)   $ 22 $ (4) $ 23
Reclassification from Accumulated Other Comprehensive Income, Current Period, Tax 5   (12) 1 (15)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax (7)   10 (3) 8
Cash Flow Hedges [Member]          
Reclassification out of Accumulated Other Comprehensive Income [Line Items]          
Energy-Related Contracts, Pre-Tax 0 $ 17 0 17 (12)
Energy-Related Contracts, Tax 0   0 (7) 5
Energy-Related Contracts, After-Tax 0   0 10 (7)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax 0 $ 10 0 10 (7)
Pension and OPEB Plans [Member]          
Reclassification out of Accumulated Other Comprehensive Income [Line Items]          
Reclassification Adjustment from AOCI, Pension and OPEB, Pre-Tax (14)   (3) (28) (9)
Reclassification Adjustment from AOCI, Pension and OPEB, Tax 6   1 12 3
Reclassification Adjustment from AOCI, Pension and OPEB, After-Tax (8)   (2) (16) (6)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax (8)   (2) (16) (6)
Available-for-Sale Securities [Member]          
Reclassification out of Accumulated Other Comprehensive Income [Line Items]          
Reclassification for Available for Sale Securities, Pre-Tax 2   25 7 44
Reclassification for Available for Sale Securities, Tax (1)   (13) (4) (23)
Reclassification for Available for Sale Securities, After-Tax 1   12 3 21
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax 1   12 3 21
Power [Member]          
Reclassification out of Accumulated Other Comprehensive Income [Line Items]          
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax (12)   21 (2) 22
Reclassification from Accumulated Other Comprehensive Income, Current Period, Tax 5   (11) 0 (14)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax (7)   10 (2) 8
Power [Member] | Cash Flow Hedges [Member]          
Reclassification out of Accumulated Other Comprehensive Income [Line Items]          
Energy-Related Contracts, Pre-Tax 0   0 17 (12)
Energy-Related Contracts, Tax 0   0 (7) 5
Energy-Related Contracts, After-Tax 0   0 10 (7)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax 0   0 10 (7)
Power [Member] | Pension and OPEB Plans [Member]          
Reclassification out of Accumulated Other Comprehensive Income [Line Items]          
Reclassification Adjustment from AOCI, Pension and OPEB, Pre-Tax (12)   (4) (24) (8)
Reclassification Adjustment from AOCI, Pension and OPEB, Tax 5   2 10 3
Reclassification Adjustment from AOCI, Pension and OPEB, After-Tax (7)   (2) (14) (5)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax (7)   (2) (14) (5)
Power [Member] | Available-for-Sale Securities [Member]          
Reclassification out of Accumulated Other Comprehensive Income [Line Items]          
Reclassification for Available for Sale Securities, Pre-Tax 0   25 5 42
Reclassification for Available for Sale Securities, Tax 0   (13) (3) (22)
Reclassification for Available for Sale Securities, After-Tax 0   12 2 20
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax 0   12 2 20
Operating Expense [Member] | Pension and OPEB Plans [Member]          
Reclassification out of Accumulated Other Comprehensive Income [Line Items]          
Amortization of Prior Service (Cost) Credit, Pre-Tax 3   3 6 5
Amortization of Prior Service (Cost) Credit, Tax (1)   (1) (2) (2)
Amortization of Prior Service (Cost) Credit, After-Tax 2   2 4 3
Amortization of Actuarial Loss, Pre-Tax (17)   (6) (34) (14)
Amortization of Actuarial Loss, Tax 7   2 14 5
Amortization of Actuarial Loss, After-Tax (10)   (4) (20) (9)
Operating Expense [Member] | Power [Member] | Pension and OPEB Plans [Member]          
Reclassification out of Accumulated Other Comprehensive Income [Line Items]          
Amortization of Prior Service (Cost) Credit, Pre-Tax 3   2 6 4
Amortization of Prior Service (Cost) Credit, Tax (1)   (1) (2) (2)
Amortization of Prior Service (Cost) Credit, After-Tax 2   1 4 2
Amortization of Actuarial Loss, Pre-Tax (15)   (6) (30) (12)
Amortization of Actuarial Loss, Tax 6   3 12 5
Amortization of Actuarial Loss, After-Tax (9)   (3) (18) (7)
Operating Revenues [Member] | Cash Flow Hedges [Member]          
Reclassification out of Accumulated Other Comprehensive Income [Line Items]          
Energy-Related Contracts, Pre-Tax 0   0 17 (12)
Energy-Related Contracts, Tax 0   0 (7) 5
Energy-Related Contracts, After-Tax 0   0 10 (7)
Operating Revenues [Member] | Power [Member] | Cash Flow Hedges [Member]          
Reclassification out of Accumulated Other Comprehensive Income [Line Items]          
Energy-Related Contracts, Pre-Tax 0   0 17 (12)
Energy-Related Contracts, Tax 0   0 (7) 5
Energy-Related Contracts, After-Tax 0   0 10 (7)
Other Income [Member] | Available-for-Sale Securities [Member]          
Reclassification out of Accumulated Other Comprehensive Income [Line Items]          
Reclassification for Available for Sale Securities, Pre-Tax 16   33 35 58
Reclassification for Available for Sale Securities, Tax (8)   (17) (18) (30)
Reclassification for Available for Sale Securities, After-Tax 8   16 17 28
Other Income [Member] | Power [Member] | Available-for-Sale Securities [Member]          
Reclassification out of Accumulated Other Comprehensive Income [Line Items]          
Reclassification for Available for Sale Securities, Pre-Tax 14   33 33 56
Reclassification for Available for Sale Securities, Tax (7)   (17) (17) (29)
Reclassification for Available for Sale Securities, After-Tax 7   16 16 27
Other Expense [Member] | Available-for-Sale Securities [Member]          
Reclassification out of Accumulated Other Comprehensive Income [Line Items]          
Reclassification for Available for Sale Securities, Pre-Tax (4)   (6) (13) (10)
Reclassification for Available for Sale Securities, Tax 2   3 7 5
Reclassification for Available for Sale Securities, After-Tax (2)   (3) (6) (5)
Other Expense [Member] | Power [Member] | Available-for-Sale Securities [Member]          
Reclassification out of Accumulated Other Comprehensive Income [Line Items]          
Reclassification for Available for Sale Securities, Pre-Tax (4)   (6) (13) (10)
Reclassification for Available for Sale Securities, Tax 2   3 7 5
Reclassification for Available for Sale Securities, After-Tax (2)   (3) (6) (5)
Other-Than-Temporary Impairments [Member] | Available-for-Sale Securities [Member]          
Reclassification out of Accumulated Other Comprehensive Income [Line Items]          
Reclassification for Available for Sale Securities, Pre-Tax (10)   (2) (15) (4)
Reclassification for Available for Sale Securities, Tax 5   1 7 2
Reclassification for Available for Sale Securities, After-Tax (5)   (1) (8) (2)
Other-Than-Temporary Impairments [Member] | Power [Member] | Available-for-Sale Securities [Member]          
Reclassification out of Accumulated Other Comprehensive Income [Line Items]          
Reclassification for Available for Sale Securities, Pre-Tax (10)   (2) (15) (4)
Reclassification for Available for Sale Securities, Tax 5   1 7 2
Reclassification for Available for Sale Securities, After-Tax $ (5)   $ (1) $ (8) $ (2)