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Other Comprehensive Income (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |
Accumulated other comprehensive income (loss) at beginning of period | $ 17,616 |  |  |  |
Total income tax benefit | (402) |  | $ (146) |  | $ (135)
Accumulated other comprehensive income (loss) at end of period | 19,522 |  | 17,616 |  |
Gains and Losses on Cash Flow Hedges |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |
Accumulated other comprehensive income (loss) at beginning of period | (53) |  | (54) |  |
Other comprehensive loss before reclassifications, net of tax | 22 |  | (2) |  |
Amortization of net actuarial loss | 0 |  | 0 |  |
Net current period other comprehensive income (loss) | 24 |  | 1 |  |
Accumulated other comprehensive income (loss) at end of period | (29) |  | (53) |  | (54)
Gains and Losses on Cash Flow Hedges | Interest Rate Swap |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |
Amortization of net actuarial loss | (2) | [1] | (3) | [2] |
Defined Benefit Pension and Postretirement Items |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |
Accumulated other comprehensive income (loss) at beginning of period | (41) |  | (39) |  |
Other comprehensive loss before reclassifications, net of tax | (3) |  | (4) |  |
Amortization of net actuarial loss | (5) | [3] | (2) | [4] |
Net current period other comprehensive income (loss) | 2 |  | (2) |  |
Accumulated other comprehensive income (loss) at end of period | (39) |  | (41) |  | (39)
Defined Benefit Pension and Postretirement Items | Interest Rate Swap |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |
Amortization of net actuarial loss | 0 |  | 0 |  |
Total |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |
Accumulated other comprehensive income (loss) at beginning of period | (94) |  | (93) |  |
Other comprehensive loss before reclassifications, net of tax | 19 |  | (6) |  |
Amortization of net actuarial loss | (5) |  | (2) |  |
Net current period other comprehensive income (loss) | 26 |  | (1) |  |
Accumulated other comprehensive income (loss) at end of period | (68) |  | (94) |  | $ (93)
Total | Interest Rate Swap |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |
Amortization of net actuarial loss | $ (2) |  | $ (3) |  |
[1] | Included in interest charges.
[2] | Included in interest charges.
[3] | Included in the computation of net periodic pension and postretirement benefit costs. See Note 11 for further information.
[4] | Included in the computation of net periodic pension and postretirement benefit costs. See Note 11 for further information.

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