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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)

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