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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, 2018 | Mar. 31, 2017 | Dec. 31, 2017
Reclassification out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax | $ (15) | $ 18 |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Tax | 5 | (9) |
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) | (10) | 9 |
Cash Flow Hedges [Member] |  |  |
Reclassification out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) | 0 | 0 | $ 2
Pension and OPEB Plans [Member] |  |  |
Reclassification out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Reclassification Adjustment from AOCI, Pension and OPEB, Pre-Tax | (11) | (10) |
Reclassification Adjustment from AOCI, Pension and OPEB, Tax | 3 | 4 |
Reclassification Adjustment from AOCI, Pension and OPEB, After-Tax | (8) | (6) |
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) | (8) | (6) |
Available-for-Sale Securities [Member] |  |  |
Reclassification out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Reclassification for Available for Sale Securities, Pre-Tax | (4) | 28 |
Reclassification for Available for Sale Securities, Tax | 2 | (13) |
Reclassification for Available for Sale Securities, After-Tax | (2) | 15 |
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) | (2) | 15 |
Power [Member] |  |  |
Reclassification out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax | (13) | 10 |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Tax | 5 | (6) |
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) | (8) | 4 |
Power [Member] | Cash Flow Hedges [Member] |  |  |
Reclassification out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) | 0 | 0 |
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 | (9) | (9) |
Reclassification Adjustment from AOCI, Pension and OPEB, Tax | 3 | 4 |
Reclassification Adjustment from AOCI, Pension and OPEB, After-Tax | (6) | (5) |
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) | (6) | (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 | (4) | 19 |
Reclassification for Available for Sale Securities, Tax | 2 | (10) |
Reclassification for Available for Sale Securities, After-Tax | (2) | 9 |
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) | (2) | 9 |
Non-Operating Pension and OPEB Credits (Costs) [Member] | Pension and OPEB Plans [Member] |  |  |
Reclassification out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Amortization of Prior Service (Cost) Credit, Pre-Tax | 1 | 2 |
Amortization of Prior Service (Cost) Credit, Tax | 0 | (1) |
Amortization of Prior Service (Cost) Credit, After-Tax | 1 | 1 |
Amortization of Actuarial Loss, Pre-Tax | (12) | (12) |
Amortization of Actuarial Loss, Tax | 3 | 5 |
Amortization of Actuarial Loss, After-Tax | (9) | (7) |
Non-Operating Pension and OPEB Credits (Costs) [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 | 1 | 2 |
Amortization of Prior Service (Cost) Credit, Tax | 0 | (1) |
Amortization of Prior Service (Cost) Credit, After-Tax | 1 | 1 |
Amortization of Actuarial Loss, Pre-Tax | (10) | (11) |
Amortization of Actuarial Loss, Tax | 3 | 5 |
Amortization of Actuarial Loss, After-Tax | (7) | (6) |
Net Gains (Losses) on Trust Investments [Member] | Available-for-Sale Securities [Member] |  |  |
Reclassification out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Reclassification for Available for Sale Securities, Pre-Tax | (4) | 28 |
Reclassification for Available for Sale Securities, Tax | 2 | (13) |
Reclassification for Available for Sale Securities, After-Tax | (2) | 15 |
Net Gains (Losses) on Trust Investments [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) | 19 |
Reclassification for Available for Sale Securities, Tax | 2 | (10) |
Reclassification for Available for Sale Securities, After-Tax | $ (2) | $ 9 |

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