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Employee Benefit Plans - Net Periodic Benefits Cost and Other Recognized in the OCI (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Pension Plan [Member] |  |  |
Defined Benefit Plan, Net Periodic Cost (Benefit) |  |  |
Service cost | $ (2) | $ (3) | $ (4)
Interest cost | 176 | 180 | 111
Expected return on plan assets | (230) | (235) | (202)
Amortization of prior service credit | 0 | 0 | 0
Amortization of actuarial loss | 34 | 29 | 62
Net periodic cost (benefit) | (18) | (23) | (25)
Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss) |  |  |
Amortization of actuarial loss | 34 | 29 | 62
Amortization of prior service credit | 0 | 0 | 0
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, before Tax | (41) | (142) | 89
Prior service cost | 0 | 0 | 0
Total | (7) | (113) | 151
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax [Abstract] |  |  |
Net loss | (1,784) | (1,777) | (1,664)
Prior service credit | 0 | 0 | 0
Total | (1,784) | (1,777) | (1,664)
Other Postretirement Benefits Plan [Member] |  |  |
Defined Benefit Plan, Net Periodic Cost (Benefit) |  |  |
Service cost | 0 | 0 | 0
Interest cost | 7 | 7 | 4
Expected return on plan assets | (1) | (1) | (2)
Amortization of prior service credit | (7) | (7) | (7)
Amortization of actuarial loss | 5 | 5 | 7
Net periodic cost (benefit) | 4 | 4 | 2
Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss) |  |  |
Amortization of actuarial loss | 5 | 5 | 7
Amortization of prior service credit | (7) | (7) | (7)
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, before Tax | 7 | (6) | 30
Prior service cost | 0 | 0 | 0
Total | 5 | (8) | 30
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax [Abstract] |  |  |
Net loss | (76) | (88) | (87)
Prior service credit | 33 | 40 | 47
Total | $ (43) | $ (48) | $ (40)

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