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Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022 | Jun. 30, 2023 | Dec. 31, 2022 | Jun. 30, 2022 | Dec. 31, 2021
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |  |  |  |  |  |
Accumulated other comprehensive income (loss) |  | $ 17,309 |  | $ 17,309 |  |  | $ 16,675 |  |
Interest Rate Derivatives, Tax |  | 40 | $ 44 | (101) | $ (80) |  |  |  |
Gains and Losses on Cash Flow Hedges |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |  |  |  |  |  |
Accumulated other comprehensive income (loss) |  | (40) | (56) | (40) | (56) | $ (44) | (54) | $ (57) | $ (75)
Losses reclassified from net accumulated other comprehensive loss | [1] | 0 | 0 | 0 | 0 |  |  |  |
Net current period other comprehensive income (loss) |  | 4 | 1 | 14 | 19 |  |  |  |
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax |  | 3 | 0 | 11 | 15 |  |  |  |
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 | 3 | 4 |  |  |  |
Defined Benefit Pension and Postretirement Items |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |  |  |  |  |  |
Accumulated other comprehensive income (loss) |  | (38) | (35) | (38) | (35) | (38) | (39) | (46) | (48)
Losses reclassified from net accumulated other comprehensive loss | [1] | 0 | 1 | 1 | 2 |  |  |  |
Net current period other comprehensive income (loss) |  | 0 | 11 | 1 | 13 |  |  |  |
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax |  | 0 | 10 | 0 | 11 |  |  |  |
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) |  | (78) | (91) | (78) | (91) | $ (82) | $ (93) | $ (103) | $ (123)
Losses reclassified from net accumulated other comprehensive loss | [1] | 0 | 1 | 1 | 2 |  |  |  |
Net current period other comprehensive income (loss) |  | 4 | 12 | 15 | 32 |  |  |  |
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax |  | 3 | 10 | 11 | 26 |  |  |  |
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 | $ 3 | $ 4 |  |  |  |
[1] | Included in the computation of net periodic pension and postretirement benefit costs.
[2] | Included in interest charges.

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