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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 | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017
Reclassification out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax | $ (12) | $ 15 | $ (27) | $ 33 |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Tax | 4 | (8) | 9 | (17) |
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) | (8) | 7 | (18) | 16 |
Cash Flow Hedges [Member] |  |  |  |  |
Reclassification out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) | 0 | 0 | 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 | (10) | (10) | (21) | (20) |
Reclassification Adjustment from AOCI, Pension and OPEB, Tax | 3 | 4 | 6 | 8 |
Reclassification Adjustment from AOCI, Pension and OPEB, After-Tax | (7) | (6) | (15) | (12) |
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) | (7) | (6) | (15) | (12) |
Available-for-Sale Securities [Member] |  |  |  |  |
Reclassification out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |
Reclassification for Available for Sale Securities, Pre-Tax | (2) | 25 | (6) | 53 |
Reclassification for Available for Sale Securities, Tax | 1 | (12) | 3 | (25) |
Reclassification for Available for Sale Securities, After-Tax | (1) | 13 | (3) | 28 |
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) | (1) | 13 | (3) | 28 |
Power [Member] |  |  |  |  |
Reclassification out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax | (10) | 16 | (23) | 26 |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Tax | 3 | (9) | 8 | (15) |
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) | (7) | 7 | (15) | 11 |
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 | 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 | (8) | (8) | (17) | (17) |
Reclassification Adjustment from AOCI, Pension and OPEB, Tax | 2 | 3 | 5 | 7 |
Reclassification Adjustment from AOCI, Pension and OPEB, After-Tax | (6) | (5) | (12) | (10) |
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) | (6) | (5) | (12) | (10) |
Power [Member] | Available-for-Sale Securities [Member] |  |  |  |  |
Reclassification out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |
Reclassification for Available for Sale Securities, Pre-Tax | (2) | 24 | (6) | 43 |
Reclassification for Available for Sale Securities, Tax | 1 | (12) | 3 | (22) |
Reclassification for Available for Sale Securities, After-Tax | (1) | 12 | (3) | 21 |
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) | (1) | 12 | (3) | 21 |
Operation and Maintenance Expense [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 | (11) | (12) |  |  |
Amortization of Actuarial Loss, Tax | 3 | 5 |  |  |
Amortization of Actuarial Loss, After-Tax | (8) | (7) |  |  |
Operation and Maintenance 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 | 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 | (9) | (10) |  |  |
Amortization of Actuarial Loss, Tax | 2 | 4 |  |  |
Amortization of Actuarial Loss, After-Tax | (7) | (6) |  |  |
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 |  |  | 2 | 4 |
Amortization of Prior Service (Cost) Credit, Tax |  |  | 0 | (2) |
Amortization of Prior Service (Cost) Credit, After-Tax |  |  | 2 | 2 |
Amortization of Actuarial Loss, Pre-Tax |  |  | (23) | (24) |
Amortization of Actuarial Loss, Tax |  |  | 6 | 10 |
Amortization of Actuarial Loss, After-Tax |  |  | (17) | (14) |
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 |  |  | 2 | 4 |
Amortization of Prior Service (Cost) Credit, Tax |  |  | 0 | (2) |
Amortization of Prior Service (Cost) Credit, After-Tax |  |  | 2 | 2 |
Amortization of Actuarial Loss, Pre-Tax |  |  | (19) | (21) |
Amortization of Actuarial Loss, Tax |  |  | 5 | 9 |
Amortization of Actuarial Loss, After-Tax |  |  | (14) | (12) |
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 | (2) | 25 |  |  |
Reclassification for Available for Sale Securities, Tax | 1 | (12) |  |  |
Reclassification for Available for Sale Securities, After-Tax | (1) | 13 |  |  |
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 | (2) | 24 |  |  |
Reclassification for Available for Sale Securities, Tax | 1 | (12) |  |  |
Reclassification for Available for Sale Securities, After-Tax | $ (1) | $ 12 |  |  |
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 |  |  | (6) | 53 |
Reclassification for Available for Sale Securities, Tax |  |  | 3 | (25) |
Reclassification for Available for Sale Securities, After-Tax |  |  | (3) | 28 |
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 |  |  | (6) | 43 |
Reclassification for Available for Sale Securities, Tax |  |  | 3 | (22) |
Reclassification for Available for Sale Securities, After-Tax |  |  | $ (3) | $ 21 |

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