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Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2024 | Mar. 31, 2023 | Dec. 31, 2023 | Dec. 31, 2022
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |  |
Accumulated other comprehensive income (loss) |  | $ 17,841 |  | $ 17,616 |
Interest Rate Derivatives, Tax |  | (27) | $ (53) |  |
Gains and Losses on Cash Flow Hedges |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |  |
Accumulated other comprehensive income (loss) |  | (30) | (58) | (53) | $ (54)
Net current period other comprehensive income (loss) |  | 23 | (4) |  |
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax |  | 22 | (5) |  |
Gains and Losses on Cash Flow Hedges | Interest Rate Swap |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |  |
Losses reclassified from net accumulated other comprehensive loss | [1] | 1 | 1 |  |
Defined Benefit Pension and Postretirement Items |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |  |
Accumulated other comprehensive income (loss) |  | (41) | (39) | (41) | (39)
Net current period other comprehensive income (loss) |  | 0 | 0 |  |
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax |  | 0 | 0 |  |
Defined Benefit Pension and Postretirement Items | Interest Rate Swap |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |  |
Losses reclassified from net accumulated other comprehensive loss | [1] | 0 | 0 |  |
Total |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |  |
Accumulated other comprehensive income (loss) |  | (71) | (97) | $ (94) | $ (93)
Net current period other comprehensive income (loss) |  | 23 | (4) |  |
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax |  | 22 | (5) |  |
Total | Interest Rate Swap |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |  |
Losses reclassified from net accumulated other comprehensive loss | [1] | $ 1 | $ 1 |  |
[1] | Included in interest charges.

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