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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, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Pension Benefits |  |  |
Defined Benefit Plan, Net Periodic Cost (Benefit) |  |  |
Service cost | $ (4) | $ (4) | $ (4)
Interest cost | 127 | 159 | 142
Expected return on plan assets | (215) | (226) | (227)
Amortization of prior service credit | 0 | 0 | 0
Amortization of actuarial loss | 60 | 44 | 49
Net periodic cost (benefit) | (24) | (19) | (32)
Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss) |  |  |
Amortization of actuarial loss | 60 | 44 | 49
Amortization of prior service credit | 0 | 0 | 0
Prior service cost (credit) | (106) | (88) | (91)
Prior service cost | 0 | 0 | 0
Total | (46) | (44) | (42)
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax [Abstract] |  |  |
Net loss | (2,098) | (2,052) | (2,008)
Prior service credit | 0 | 0 | 0
Total | (2,098) | (2,052) | (2,008)
Other Postretirement Benefits |  |  |
Defined Benefit Plan, Net Periodic Cost (Benefit) |  |  |
Service cost | 0 | 0 | 0
Interest cost | 6 | 8 | 7
Expected return on plan assets | (4) | (4) | (7)
Amortization of prior service credit | (7) | (7) | (7)
Amortization of actuarial loss | 7 | 6 | 6
Net periodic cost (benefit) | 2 | 3 | (1)
Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss) |  |  |
Amortization of actuarial loss | 7 | 6 | 6
Amortization of prior service credit | (7) | (7) | (6)
Prior service cost (credit) | (11) | (18) | 3
Prior service cost | 0 | 2 | 0
Total | (11) | (17) | 3
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax [Abstract] |  |  |
Net loss | (136) | (132) | (120)
Prior service credit | 60 | 67 | 72
Total | $ (76) | $ (65) | $ (48)

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