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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, 2024 | Mar. 31, 2023 | Dec. 31, 2023
Reclassification out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax | $ (4) | $ (16) |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Tax | 2 | 6 |
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) | (2) | (10) |
Cash Flow Hedges [Member] |  |  |
Reclassification out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Cash Flow Hedge, Pre-tax | 3 | (1) |
Cash Flow Hedge, Tax | 1 | 0 |
Cash Flow Hedge, After Tax | 2 | (1) |
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax | 3 |  | $ 5
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) | 2 | (1) | $ 3
Pension and OPEB Plans [Member] |  |  |
Reclassification out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Reclassification Adjustment from AOCI, Pension and OPEB, Pre-Tax | (5) | (5) |
Reclassification Adjustment from AOCI, Pension and OPEB, Tax | 2 | 2 |
Reclassification Adjustment from AOCI, Pension and OPEB, After-Tax | (3) | (3) |
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax | (3) |  |
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) | (2) | (3) |
Reclassification from AOCI, Current Period, Tax | 1 |  |
Available-for-Sale Securities [Member] |  |  |
Reclassification out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Reclassification for Available for Sale Securities, Pre-Tax | (4) | (10) |
Reclassification for Available for Sale Securities, Tax | 2 | 4 |
Reclassification for Available for Sale Securities, After-Tax | (2) | (6) |
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) | (2) | (6) |
Interest Expense [Member] | Cash Flow Hedges [Member] |  |  |
Reclassification out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Cash Flow Hedge, Pre-tax | 3 | (1) |
Cash Flow Hedge, Tax | (1) | 0 |
Cash Flow Hedge, After Tax | 2 | (1) |
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 |
Amortization of Prior Service (Cost) Credit, Tax |  | 0 |
Amortization of Prior Service (Cost) Credit, After-Tax |  | 2 |
Amortization of Actuarial Loss, Pre-Tax | (3) | (7) |
Amortization of Actuarial Loss, Tax | 1 | 2 |
Amortization of Actuarial Loss, After-Tax | (2) | (5) |
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) | (10) |
Reclassification for Available for Sale Securities, Tax | 2 | 4 |
Reclassification for Available for Sale Securities, After-Tax | $ (2) | $ (6) |

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