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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 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Jun. 30, 2016
Sep. 30, 2016
Sep. 30, 2015
Reclassification out of Accumulated Other Comprehensive Income [Line Items]          
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax $ (11) $ (42)   $ (55) $ (46)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Tax 4 18   24 19
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax (7) (24)   (31) (27)
Cash Flow Hedges [Member]          
Reclassification out of Accumulated Other Comprehensive Income [Line Items]          
Energy-Related Contracts, Pre-Tax 0 0 $ 0   17
Energy-Related Contracts, Tax   0     (7)
Energy-Related Contracts, After-Tax   0     10
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax 0 0 $ 0 0 10
Pension and OPEB Plans [Member]          
Reclassification out of Accumulated Other Comprehensive Income [Line Items]          
Reclassification Adjustment from AOCI, Pension and OPEB, Pre-Tax (14) (14)   (42) (42)
Reclassification Adjustment from AOCI, Pension and OPEB, Tax 5 5   17 17
Reclassification Adjustment from AOCI, Pension and OPEB, After-Tax (9) (9)   (25) (25)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax (9) (9)   (25) (25)
Available-for-Sale Securities [Member]          
Reclassification out of Accumulated Other Comprehensive Income [Line Items]          
Reclassification for Available for Sale Securities, Pre-Tax 3 (28)   (13) (21)
Reclassification for Available for Sale Securities, Tax (1) 13   7 9
Reclassification for Available for Sale Securities, After-Tax 2 (15)   (6) (12)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax 2 (15)   (6) (12)
Power [Member]          
Reclassification out of Accumulated Other Comprehensive Income [Line Items]          
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax (9) (39)   (50) (41)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Tax 4 18   22 18
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax (5) (21)   (28) (23)
Power [Member] | Cash Flow Hedges [Member]          
Reclassification out of Accumulated Other Comprehensive Income [Line Items]          
Energy-Related Contracts, Pre-Tax   0     17
Energy-Related Contracts, Tax   0     (7)
Energy-Related Contracts, After-Tax   0     10
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax 0 0   0 10
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) (12)   (36) (36)
Reclassification Adjustment from AOCI, Pension and OPEB, Tax 5 5   15 15
Reclassification Adjustment from AOCI, Pension and OPEB, After-Tax (7) (7)   (21) (21)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax (7) (7)   (21) (21)
Power [Member] | Available-for-Sale Securities [Member]          
Reclassification out of Accumulated Other Comprehensive Income [Line Items]          
Reclassification for Available for Sale Securities, Pre-Tax 3 (27)   (14) (22)
Reclassification for Available for Sale Securities, Tax (1) 13   7 10
Reclassification for Available for Sale Securities, After-Tax 2 (14)   (7) (12)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax 2 (14)   (7) (12)
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   9 9
Amortization of Prior Service (Cost) Credit, Tax (2) (1)   (4) (3)
Amortization of Prior Service (Cost) Credit, After-Tax 1 2   5 6
Amortization of Actuarial Loss, Pre-Tax (17) (17)   (51) (51)
Amortization of Actuarial Loss, Tax 7 6   21 20
Amortization of Actuarial Loss, After-Tax (10) (11)   (30) (31)
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 3   8 9
Amortization of Prior Service (Cost) Credit, Tax (1) (1)   (3) (3)
Amortization of Prior Service (Cost) Credit, After-Tax 2 2   5 6
Amortization of Actuarial Loss, Pre-Tax (15) (15)   (44) (45)
Amortization of Actuarial Loss, Tax 6 6   18 18
Amortization of Actuarial Loss, After-Tax (9) (9)   (26) (27)
Operating Revenues [Member] | Cash Flow Hedges [Member]          
Reclassification out of Accumulated Other Comprehensive Income [Line Items]          
Energy-Related Contracts, Pre-Tax   0     17
Energy-Related Contracts, Tax   0     (7)
Energy-Related Contracts, After-Tax   0     10
Operating Revenues [Member] | Power [Member] | Cash Flow Hedges [Member]          
Reclassification out of Accumulated Other Comprehensive Income [Line Items]          
Energy-Related Contracts, Pre-Tax   0     17
Energy-Related Contracts, Tax   0     (7)
Energy-Related Contracts, After-Tax   0     10
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 13 14   41 49
Reclassification for Available for Sale Securities, Tax (6) (7)   (20) (25)
Reclassification for Available for Sale Securities, After-Tax 7 7   21 24
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 12 14   37 47
Reclassification for Available for Sale Securities, Tax (5) (7)   (18) (24)
Reclassification for Available for Sale Securities, After-Tax 7 7   19 23
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 (5) (12)   (29) (25)
Reclassification for Available for Sale Securities, Tax 3 5   15 12
Reclassification for Available for Sale Securities, After-Tax (2) (7)   (14) (13)
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) (11)   (26) (24)
Reclassification for Available for Sale Securities, Tax 2 5   13 12
Reclassification for Available for Sale Securities, After-Tax (2) (6)   (13) (12)
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 (5) (30)   (25) (45)
Reclassification for Available for Sale Securities, Tax 2 15   12 22
Reclassification for Available for Sale Securities, After-Tax (3) (15)   (13) (23)
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 (5) (30)   (25) (45)
Reclassification for Available for Sale Securities, Tax 2 15   12 22
Reclassification for Available for Sale Securities, After-Tax $ (3) $ (15)   $ (13) $ (23)