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Accumulated Other Comprehensive Income (Loss), Net of Tax (Reclassifications of AOCI) (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2014
Mar. 31, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Reclassification out of Accumulated Other Comprehensive Income [Line Items]          
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax $ 22   $ (15) $ 23 $ (26)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Tax (12)   6 (15) 11
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax 10   (9) 8 (15)
Cash Flow Hedges [Member]
          
Reclassification out of Accumulated Other Comprehensive Income [Line Items]          
Energy-Related Contracts, Pre-Tax 0 12 (1) 12 (7)
Energy-Related Contracts, Tax 0   (1) 5 (3)
Energy-Related Contracts, After-Tax 0   0 7 (4)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax 0 (7) 0 (7) 4
Pension and OPEB Plans [Member]
          
Reclassification out of Accumulated Other Comprehensive Income [Line Items]          
Reclassification Adjustment from AOCI, Pension and OPEB, Pre-Tax (3)   (16) (9) (33)
Reclassification Adjustment from AOCI, Pension and OPEB, Tax 1   7 3 14
Reclassification Adjustment from AOCI, Pension and OPEB, After-Tax (2)   (9) (6) (19)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax (2)   (9) (6) (19)
Available-for-Sale Securities [Member]
          
Reclassification out of Accumulated Other Comprehensive Income [Line Items]          
Reclassification for Available for Sale Securities, Pre-Tax 25   0 44 0
Reclassification for Available for Sale Securities, Tax (13)   0 (23) 0
Reclassification for Available for Sale Securities, After-Tax 12   0 21 0
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax 12   0 21 0
Power [Member]
          
Reclassification out of Accumulated Other Comprehensive Income [Line Items]          
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax 21   (12) 22 (20)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Tax (11)   5 (14) 8
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax 10   (7) 8 (12)
Power [Member] | Cash Flow Hedges [Member]
          
Reclassification out of Accumulated Other Comprehensive Income [Line Items]          
Energy-Related Contracts, Pre-Tax 0   (2) 12 (8)
Energy-Related Contracts, Tax 0   (1) 5 (3)
Energy-Related Contracts, After-Tax 0   (1) 7 (5)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax 0   1 (7) 5
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 (4)   (14) (8) (28)
Reclassification Adjustment from AOCI, Pension and OPEB, Tax 2   6 3 11
Reclassification Adjustment from AOCI, Pension and OPEB, After-Tax (2)   (8) (5) (17)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax (2)   (8) (5) (17)
Power [Member] | Available-for-Sale Securities [Member]
          
Reclassification out of Accumulated Other Comprehensive Income [Line Items]          
Reclassification for Available for Sale Securities, Pre-Tax 25   0 42 0
Reclassification for Available for Sale Securities, Tax (13)   0 (22) 0
Reclassification for Available for Sale Securities, After-Tax 12   0 20 0
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax 12   0 20 0
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   1 5 5
Amortization of Prior Service (Cost) Credit, Tax (1)   0 (2) (2)
Amortization of Prior Service (Cost) Credit, After-Tax 2   1 3 3
Amortization of Actuarial Loss, Pre-Tax (6)   (17) (14) (38)
Amortization of Actuarial Loss, Tax 2   7 5 16
Amortization of Actuarial Loss, After-Tax (4)   (10) (9) (22)
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 2   2 4 4
Amortization of Prior Service (Cost) Credit, Tax (1)   (1) (2) (2)
Amortization of Prior Service (Cost) Credit, After-Tax 1   1 2 2
Amortization of Actuarial Loss, Pre-Tax (6)   (16) 12 32
Amortization of Actuarial Loss, Tax 3   7 (5) (13)
Amortization of Actuarial Loss, After-Tax (3)   (9) 7 19
Operating Revenues [Member] | Cash Flow Hedges [Member]
          
Reclassification out of Accumulated Other Comprehensive Income [Line Items]          
Energy-Related Contracts, Pre-Tax 0   2 12 (8)
Energy-Related Contracts, Tax 0   1 5 (3)
Energy-Related Contracts, After-Tax 0   1 7 (5)
Operating Revenues [Member] | Power [Member] | Cash Flow Hedges [Member]
          
Reclassification out of Accumulated Other Comprehensive Income [Line Items]          
Energy-Related Contracts, Pre-Tax 0   (2) 12 (8)
Energy-Related Contracts, Tax 0   (1) 5 (3)
Energy-Related Contracts, After-Tax 0   (1) 7 (5)
Interest Expense [Member] | Cash Flow Hedges [Member]
          
Reclassification out of Accumulated Other Comprehensive Income [Line Items]          
Energy-Related Contracts, Pre-Tax 0   1 0 1
Energy-Related Contracts, Tax 0   0   0
Energy-Related Contracts, After-Tax 0   1 0 1
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 33   2 58 4
Reclassification for Available for Sale Securities, Tax (17)   (1) (30) (2)
Reclassification for Available for Sale Securities, After-Tax 16   1 28 2
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 33   2 56 4
Reclassification for Available for Sale Securities, Tax (17)   (1) (29) (2)
Reclassification for Available for Sale Securities, After-Tax 16   1 27 2
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 (6)     (10)  
Reclassification for Available for Sale Securities, Tax 3     5  
Reclassification for Available for Sale Securities, After-Tax (3)     (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 (6)   0 (10) 0
Reclassification for Available for Sale Securities, Tax 3   0 5 0
Reclassification for Available for Sale Securities, After-Tax (3)   0 (5) 0
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 (2)   (2) (4) (4)
Reclassification for Available for Sale Securities, Tax 1   1 2 2
Reclassification for Available for Sale Securities, After-Tax (1)   (1) (2) (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 (2)   (2) (4) (4)
Reclassification for Available for Sale Securities, Tax 1   1 2 2
Reclassification for Available for Sale Securities, After-Tax $ (1)   $ (1) $ (2) $ (2)