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Accumulated Other Comprehensive Income (Loss), Net of Tax (Reclassifications of AOCI) (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2016 | Mar. 31, 2015 | Dec. 31, 2015
Reclassification out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax | $ (25) | $ 8 |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Tax | 11 | (4) |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | (14) | 4 |
Cash Flow Hedges [Member] |  |  |
Reclassification out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Energy-Related Contracts, Pre-Tax | 0 | 17 | $ 20
Energy-Related Contracts, Tax |  | (7) |
Energy-Related Contracts, After-Tax |  | 10 |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | 0 | 10 | $ 12
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) |
Reclassification Adjustment from AOCI, Pension and OPEB, Tax | 6 | 6 |
Reclassification Adjustment from AOCI, Pension and OPEB, After-Tax | (8) | (8) |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | (8) | (8) |
Available-for-Sale Securities [Member] |  |  |
Reclassification out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Reclassification for Available for Sale Securities, Pre-Tax | (11) | 5 |
Reclassification for Available for Sale Securities, Tax | 5 | (3) |
Reclassification for Available for Sale Securities, After-Tax | (6) | 2 |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | (6) | 2 |
Power [Member] |  |  |
Reclassification out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax | (23) | 10 |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Tax | 10 | (5) |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | (13) | 5 |
Power [Member] | Cash Flow Hedges [Member] |  |  |
Reclassification out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Energy-Related Contracts, Pre-Tax |  | 17 |
Energy-Related Contracts, Tax |  | (7) |
Energy-Related Contracts, After-Tax |  | 10 |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | 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) |
Reclassification Adjustment from AOCI, Pension and OPEB, Tax | 5 | 5 |
Reclassification Adjustment from AOCI, Pension and OPEB, After-Tax | (7) | (7) |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | (7) | (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 | (11) | 5 |
Reclassification for Available for Sale Securities, Tax | 5 | (3) |
Reclassification for Available for Sale Securities, After-Tax | (6) | 2 |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | (6) | 2 |
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 |
Amortization of Prior Service (Cost) Credit, Tax | (1) | (1) |
Amortization of Prior Service (Cost) Credit, After-Tax | 2 | 2 |
Amortization of Actuarial Loss, Pre-Tax | (17) | (17) |
Amortization of Actuarial Loss, Tax | 7 | 7 |
Amortization of Actuarial Loss, After-Tax | (10) | (10) |
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 |
Amortization of Prior Service (Cost) Credit, Tax | (1) | (1) |
Amortization of Prior Service (Cost) Credit, After-Tax | 2 | 2 |
Amortization of Actuarial Loss, Pre-Tax | (15) | (15) |
Amortization of Actuarial Loss, Tax | 6 | 6 |
Amortization of Actuarial Loss, After-Tax | (9) | (9) |
Operating Revenues [Member] | Cash Flow Hedges [Member] |  |  |
Reclassification out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Energy-Related Contracts, Pre-Tax |  | 17 |
Energy-Related Contracts, Tax |  | (7) |
Energy-Related Contracts, After-Tax |  | 10 |
Operating Revenues [Member] | Power [Member] | Cash Flow Hedges [Member] |  |  |
Reclassification out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Energy-Related Contracts, Pre-Tax |  | 17 |
Energy-Related Contracts, Tax |  | (7) |
Energy-Related Contracts, After-Tax |  | 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 | 16 | 19 |
Reclassification for Available for Sale Securities, Tax | (8) | (10) |
Reclassification for Available for Sale Securities, After-Tax | 8 | 9 |
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 | 15 | 19 |
Reclassification for Available for Sale Securities, Tax | (8) | (10) |
Reclassification for Available for Sale Securities, After-Tax | 7 | 9 |
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 | (17) | (9) |
Reclassification for Available for Sale Securities, Tax | 8 | 5 |
Reclassification for Available for Sale Securities, After-Tax | (9) | (4) |
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 | (16) | (9) |
Reclassification for Available for Sale Securities, Tax | 8 | 5 |
Reclassification for Available for Sale Securities, After-Tax | (8) | (4) |
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) | (5) |
Reclassification for Available for Sale Securities, Tax | 5 | 2 |
Reclassification for Available for Sale Securities, After-Tax | (5) | (3) |
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) | (5) |
Reclassification for Available for Sale Securities, Tax | 5 | 2 |
Reclassification for Available for Sale Securities, After-Tax | $ (5) | $ (3) |

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Data Type: | na
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Period Type: |