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Accumulated Other Comprehensive Income (Loss), Net of Tax (Reclassifications of AOCI) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 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) | $ 10 | $ (39) | $ 43 |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Tax | 3 | (7) | 12 | (24) |
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) | (9) | 3 | (27) | 19 |
Cash Flow Hedges [Member] |  |  |  |  |
Reclassification out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) | 0 | 1 | 0 | 1 | $ 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) | (31) | (30) |
Reclassification Adjustment from AOCI, Pension and OPEB, Tax | 3 | 4 | 9 | 12 |
Reclassification Adjustment from AOCI, Pension and OPEB, After-Tax | (7) | (6) | (22) | (18) |
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) | (7) | (6) | (22) | (18) |
Available-for-Sale Securities [Member] |  |  |  |  |
Reclassification out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |
Reclassification for Available for Sale Securities, Pre-Tax | (2) | 18 | (8) | 71 |
Reclassification for Available for Sale Securities, Tax | 0 | (10) | 3 | (35) |
Reclassification for Available for Sale Securities, After-Tax | (2) | 8 | (5) | 36 |
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) | (2) | 8 | (5) | 36 |
Power [Member] |  |  |  |  |
Reclassification out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax | (11) | 10 | (34) | 36 |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Tax | 3 | (6) | 11 | (21) |
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) | (8) | 4 | (23) | 15 |
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 | (10) | (9) | (27) | (26) |
Reclassification Adjustment from AOCI, Pension and OPEB, Tax | 3 | 4 | 8 | 11 |
Reclassification Adjustment from AOCI, Pension and OPEB, After-Tax | (7) | (5) | (19) | (15) |
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) | (7) | (5) | (19) | (15) |
Power [Member] | Available-for-Sale Securities [Member] |  |  |  |  |
Reclassification out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |
Reclassification for Available for Sale Securities, Pre-Tax | (1) | 19 | (7) | 62 |
Reclassification for Available for Sale Securities, Tax | 0 | (10) | 3 | (32) |
Reclassification for Available for Sale Securities, After-Tax | (1) | 9 | (4) | 30 |
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) | (1) | 9 | (4) | 30 |
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 | 3 |  |  |
Amortization of Prior Service (Cost) Credit, Tax | 0 | (1) |  |  |
Amortization of Prior Service (Cost) Credit, After-Tax | 1 | 2 |  |  |
Amortization of Actuarial Loss, Pre-Tax | (11) | (13) |  |  |
Amortization of Actuarial Loss, Tax | 3 | 5 |  |  |
Amortization of Actuarial Loss, After-Tax | (8) | (8) |  |  |
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 | (11) | (11) |  |  |
Amortization of Actuarial Loss, Tax | 3 | 5 |  |  |
Amortization of Actuarial Loss, After-Tax | (8) | (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 |  |  | 3 | 7 |
Amortization of Prior Service (Cost) Credit, Tax |  |  | 0 | (3) |
Amortization of Prior Service (Cost) Credit, After-Tax |  |  | 3 | 4 |
Amortization of Actuarial Loss, Pre-Tax |  |  | (34) | (37) |
Amortization of Actuarial Loss, Tax |  |  | 9 | 15 |
Amortization of Actuarial Loss, After-Tax |  |  | (25) | (22) |
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 |  |  | 3 | 6 |
Amortization of Prior Service (Cost) Credit, Tax |  |  | 0 | (3) |
Amortization of Prior Service (Cost) Credit, After-Tax |  |  | 3 | 3 |
Amortization of Actuarial Loss, Pre-Tax |  |  | (30) | (32) |
Amortization of Actuarial Loss, Tax |  |  | 8 | 14 |
Amortization of Actuarial Loss, After-Tax |  |  | (22) | (18) |
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) | 18 |  |  |
Reclassification for Available for Sale Securities, Tax | 0 | (10) |  |  |
Reclassification for Available for Sale Securities, After-Tax | (2) | 8 |  |  |
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 | (1) | 19 |  |  |
Reclassification for Available for Sale Securities, Tax | 0 | (10) |  |  |
Reclassification for Available for Sale Securities, After-Tax | $ (1) | $ 9 |  |  |
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 |  |  | (8) | 71 |
Reclassification for Available for Sale Securities, Tax |  |  | 3 | (35) |
Reclassification for Available for Sale Securities, After-Tax |  |  | (5) | 36 |
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 |  |  | (7) | 62 |
Reclassification for Available for Sale Securities, Tax |  |  | 3 | (32) |
Reclassification for Available for Sale Securities, After-Tax |  |  | $ (4) | $ 30 |

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