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Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023 | Jun. 30, 2024 | Dec. 31, 2023 | Jun. 30, 2023 | Dec. 31, 2022
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |  |  |  |  |  |
Accumulated other comprehensive income (loss) |  | $ 19,352 |  | $ 19,352 |  |  | $ 17,616 |  |
Interest Rate Derivatives, Tax |  | 10 | $ 40 | (105) | $ (101) |  |  |  |
Gains and Losses on Cash Flow Hedges |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |  |  |  |  |  |
Accumulated other comprehensive income (loss) |  | (29) | (40) | (29) | (40) | $ (30) | (53) | $ (44) | $ (54)
Losses reclassified from net accumulated other comprehensive loss | [1] |  |  | 0 | 0 |  |  |  |
Net current period other comprehensive income (loss) |  | 1 | 4 | 24 | 14 |  |  |  |
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax |  | 0 | 3 | 22 | 11 |  |  |  |
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 | [2] | 1 | 1 | 2 | 3 |  |  |  |
Defined Benefit Pension and Postretirement Items |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |  |  |  |  |  |
Accumulated other comprehensive income (loss) |  | (37) | (38) | (37) | (38) | (37) | (41) | (38) | (39)
Losses reclassified from net accumulated other comprehensive loss | [1] |  |  | 4 | 1 |  |  |  |
Net current period other comprehensive income (loss) |  | 0 | 0 | 4 | 1 |  |  |  |
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax |  | 0 | 0 | 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 | [2] | 0 | 0 | 0 | 0 |  |  |  |
Total |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |  |  |  |  |  |
Accumulated other comprehensive income (loss) |  | (66) | (78) | (66) | (78) | $ (67) | $ (94) | $ (82) | $ (93)
Losses reclassified from net accumulated other comprehensive loss | [1] |  |  | 4 | 1 |  |  |  |
Net current period other comprehensive income (loss) |  | 1 | 4 | 28 | 15 |  |  |  |
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax |  | 0 | 3 | 22 | 11 |  |  |  |
Total | Interest Rate Swap |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |  |  |  |  |  |
Losses reclassified from net accumulated other comprehensive loss | [2] | $ 1 | $ 1 | $ 2 | $ 3 |  |  |  |
[1] | Included in the computation of net periodic pension and postretirement benefit costs. See Note 9 for further information.
[2] | Included in interest charges.

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