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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, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Pension Plan [Member] |  |  |
Defined Benefit Plan, Net Periodic Cost (Benefit) |  |  |
Service cost | $ (4) | $ (4) | $ (4)
Interest cost | 111 | 96 | 127
Expected return on plan assets | (202) | (205) | (215)
Amortization of prior service credit | 0 | 0 | 0
Amortization of actuarial loss | 62 | 69 | 60
Net periodic cost (benefit) | (25) | (36) | (24)
Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss) |  |  |
Amortization of actuarial loss | 62 | 69 | 60
Amortization of prior service credit | 0 | 0 | 0
Prior service cost (credit) | 89 | 214 | (106)
Prior service cost | 0 | 0 | 0
Total | 151 | 283 | (46)
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax [Abstract] |  |  |
Net loss | (1,664) | (1,815) | (2,098)
Prior service credit | 0 | 0 | 0
Total | (1,664) | (1,815) | (2,098)
Other Postretirement Benefits Plan [Member] |  |  |
Defined Benefit Plan, Net Periodic Cost (Benefit) |  |  |
Service cost | 0 | 0 | 0
Interest cost | 4 | 3 | 6
Expected return on plan assets | (2) | (3) | (4)
Amortization of prior service credit | (7) | (7) | (7)
Amortization of actuarial loss | 7 | 8 | 7
Net periodic cost (benefit) | 2 | 1 | 2
Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss) |  |  |
Amortization of actuarial loss | 7 | 8 | 7
Amortization of prior service credit | (7) | (7) | (7)
Prior service cost (credit) | 30 | 5 | (11)
Prior service cost | 0 | 0 | 0
Total | 30 | 6 | (11)
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax [Abstract] |  |  |
Net loss | (87) | (124) | (136)
Prior service credit | 47 | 54 | 60
Total | $ (40) | $ (70) | $ (76)

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