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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, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Pension Benefits |  |  |
Defined Benefit Plan, Net Periodic Cost (Benefit) |  |  |
Service cost | $ (4) | $ (4) | $ (4)
Interest cost | 159 | 142 | 170
Expected return on plan assets | (226) | (227) | (267)
Amortization of prior service credit | 0 | 0 |
Amortization of actuarial loss | 44 | 49 | 56
Settlements | 0 | 0 | 750
Net periodic cost (benefit) | (19) | (32) | 713
Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss) |  |  |
Amortization of actuarial loss | 44 | 49 | 56
Settlement loss | 0 | 0 | 750
Amortization of prior service credit | 0 | 0 | 0
Prior service cost (credit) | (88) | (91) | (209)
Prior service cost | 0 | 0 | 0
Total | (44) | (42) | 597
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax [Abstract] |  |  |
Net loss | (2,052) | (2,008) | (1,966)
Prior service credit | 0 | 0 | 0
Total | (2,052) | (2,008) | (1,966)
Other Postretirement Benefits |  |  |
Defined Benefit Plan, Net Periodic Cost (Benefit) |  |  |
Service cost | 0 | 0 |
Interest cost | 8 | 7 | 8
Expected return on plan assets | (4) | (7) | (8)
Amortization of prior service credit | (7) | (7) | (7)
Amortization of actuarial loss | 6 | 6 | 5
Settlements | 0 |  |
Net periodic cost (benefit) | 3 | (1) | (2)
Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss) |  |  |
Amortization of actuarial loss | 6 | 6 | 5
Settlement loss | 0 | 0 | 0
Amortization of prior service credit | (7) | (6) | (7)
Prior service cost (credit) | (18) | 3 | (12)
Prior service cost | 2 | 0 | 0
Total | (17) | 3 | (14)
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax [Abstract] |  |  |
Net loss | (132) | (120) | (129)
Prior service credit | 67 | 72 | 78
Total | $ (65) | $ (48) | $ (51)

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