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Other Comprehensive Income (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |
Accumulated other comprehensive income (loss) at beginning of period | $ 16,675 |  |  |  |
Total income tax benefit | (146) |  | $ (135) |  | $ (70)
Accumulated other comprehensive income (loss) at end of period | 17,616 |  | 16,675 |  |
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 | (54) |  | (75) |  |
Other comprehensive loss before reclassifications, net of tax | (2) |  | 16 |  |
Amortization of net actuarial loss | 0 |  | 0 |  |
Net current period other comprehensive income (loss) | 1 |  | 21 |  |
Accumulated other comprehensive income (loss) at end of period | (53) |  | (54) |  | (75)
Gains and Losses on Cash Flow Hedges | Interest Rate Swap |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |
Amortization of net actuarial loss | (3) | [1] | (5) | [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 | (39) |  | (48) |  |
Other comprehensive loss before reclassifications, net of tax | (4) |  | 5 |  |
Amortization of net actuarial loss | (2) | [3] | (4) | [4] |
Net current period other comprehensive income (loss) | (2) |  | 9 |  |
Accumulated other comprehensive income (loss) at end of period | (41) |  | (39) |  | (48)
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 | (93) |  | (123) |  |
Other comprehensive loss before reclassifications, net of tax | (6) |  | 21 |  |
Amortization of net actuarial loss | (2) |  | (4) |  |
Net current period other comprehensive income (loss) | (1) |  | 30 |  |
Accumulated other comprehensive income (loss) at end of period | (94) |  | (93) |  | $ (123)
Total | Interest Rate Swap |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |
Amortization of net actuarial loss | $ (3) |  | $ (5) |  |
[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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