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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, 2015 | Sep. 30, 2014 | Jun. 30, 2015 | Sep. 30, 2015 | Sep. 30, 2014
Reclassification out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax | $ (42) | $ 28 |  | $ (46) | $ 51
Reclassification from Accumulated Other Comprehensive Income, Current Period, Tax | 18 | (15) |  | 19 | (30)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | (24) | 13 |  | (27) | 21
Cash Flow Hedges [Member] |  |  |  |  |
Reclassification out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |
Energy-Related Contracts, Pre-Tax | 0 | 1 | $ 17 | 17 | (11)
Energy-Related Contracts, Tax | 0 | 0 |  | (7) | 5
Energy-Related Contracts, After-Tax | 0 | 1 |  | 10 | (6)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | 0 | 1 | $ 10 | 10 | (6)
Pension and OPEB Plans [Member] |  |  |  |  |
Reclassification out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |
Reclassification Adjustment from AOCI, Pension and OPEB, Pre-Tax | (14) | (5) |  | (42) | (14)
Reclassification Adjustment from AOCI, Pension and OPEB, Tax | 5 | 2 |  | 17 | 5
Reclassification Adjustment from AOCI, Pension and OPEB, After-Tax | (9) | (3) |  | (25) | (9)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | (9) | (3) |  | (25) | (9)
Available-for-Sale Securities [Member] |  |  |  |  |
Reclassification out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |
Reclassification for Available for Sale Securities, Pre-Tax | (28) | 32 |  | (21) | 76
Reclassification for Available for Sale Securities, Tax | 13 | (17) |  | 9 | (40)
Reclassification for Available for Sale Securities, After-Tax | (15) | 15 |  | (12) | 36
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | (15) | 15 |  | (12) | 36
Power [Member] |  |  |  |  |
Reclassification out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax | (39) | 31 |  | (41) | 53
Reclassification from Accumulated Other Comprehensive Income, Current Period, Tax | 18 | (16) |  | 18 | (30)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | (21) | 15 |  | (23) | 23
Power [Member] | Cash Flow Hedges [Member] |  |  |  |  |
Reclassification out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |
Energy-Related Contracts, Pre-Tax | 0 | 1 |  | 17 | (11)
Energy-Related Contracts, Tax | 0 | 0 |  | (7) | 5
Energy-Related Contracts, After-Tax | 0 | 1 |  | 10 | (6)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | 0 | 1 |  | 10 | (6)
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) | (3) |  | (36) | (11)
Reclassification Adjustment from AOCI, Pension and OPEB, Tax | 5 | 1 |  | 15 | 4
Reclassification Adjustment from AOCI, Pension and OPEB, After-Tax | (7) | (2) |  | (21) | (7)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | (7) | (2) |  | (21) | (7)
Power [Member] | Available-for-Sale Securities [Member] |  |  |  |  |
Reclassification out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |
Reclassification for Available for Sale Securities, Pre-Tax | (27) | 33 |  | (22) | 75
Reclassification for Available for Sale Securities, Tax | 13 | (17) |  | 10 | (39)
Reclassification for Available for Sale Securities, After-Tax | (14) | 16 |  | (12) | 36
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | (14) | 16 |  | (12) | 36
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 | 8
Amortization of Prior Service (Cost) Credit, Tax | (1) | (1) |  | (3) | (3)
Amortization of Prior Service (Cost) Credit, After-Tax | 2 | 2 |  | 6 | 5
Amortization of Actuarial Loss, Pre-Tax | (17) | (8) |  | (51) | (22)
Amortization of Actuarial Loss, Tax | 6 | 3 |  | 20 | 8
Amortization of Actuarial Loss, After-Tax | (11) | (5) |  | (31) | (14)
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 |  | 9 | 7
Amortization of Prior Service (Cost) Credit, Tax | (1) | (1) |  | (3) | (3)
Amortization of Prior Service (Cost) Credit, After-Tax | 2 | 2 |  | 6 | 4
Amortization of Actuarial Loss, Pre-Tax | (15) | (6) |  | (45) | (18)
Amortization of Actuarial Loss, Tax | 6 | 2 |  | 18 | 7
Amortization of Actuarial Loss, After-Tax | (9) | (4) |  | (27) | (11)
Operating Revenues [Member] | Cash Flow Hedges [Member] |  |  |  |  |
Reclassification out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |
Energy-Related Contracts, Pre-Tax | 0 | (1) |  | 17 | (11)
Energy-Related Contracts, Tax | 0 | 0 |  | (7) | 5
Energy-Related Contracts, After-Tax | 0 | (1) |  | 10 | (6)
Operating Revenues [Member] | Power [Member] | Cash Flow Hedges [Member] |  |  |  |  |
Reclassification out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |
Energy-Related Contracts, Pre-Tax | 0 | 1 |  | 17 | (11)
Energy-Related Contracts, Tax | 0 | 0 |  | (7) | 5
Energy-Related Contracts, After-Tax | 0 | 1 |  | 10 | (6)
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 | 14 | 47 |  | 49 | 105
Reclassification for Available for Sale Securities, Tax | (7) | (24) |  | (25) | (54)
Reclassification for Available for Sale Securities, After-Tax | 7 | 23 |  | 24 | 51
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 | 45 |  | 47 | 101
Reclassification for Available for Sale Securities, Tax | (7) | (23) |  | (24) | (52)
Reclassification for Available for Sale Securities, After-Tax | 7 | 22 |  | 23 | 49
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 | (12) | (5) |  | (25) | (15)
Reclassification for Available for Sale Securities, Tax | 5 | 2 |  | 12 | 7
Reclassification for Available for Sale Securities, After-Tax | (7) | (3) |  | (13) | (8)
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 | (11) | (2) |  | (24) | (12)
Reclassification for Available for Sale Securities, Tax | 5 | 1 |  | 12 | 6
Reclassification for Available for Sale Securities, After-Tax | (6) | (1) |  | (12) | (6)
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 | (30) | (10) |  | (45) | (14)
Reclassification for Available for Sale Securities, Tax | 15 | 5 |  | 22 | 7
Reclassification for Available for Sale Securities, After-Tax | (15) | (5) |  | (23) | (7)
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 | (30) | (10) |  | (45) | (14)
Reclassification for Available for Sale Securities, Tax | 15 | 5 |  | 22 | 7
Reclassification for Available for Sale Securities, After-Tax | $ (15) | $ (5) |  | $ (23) | $ (7)

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