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Pensions and Other Postretirement Benefits - Benefit Obligations and Plan Assets (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Pension Plan |  |  |
Change in benefit obligations: |  |  |
Benefit obligation at beginning of year | $ 2,588 | $ 2,371 |
Service cost | 40 | 35 | $ 39
Interest cost | 74 | 93 | 83
Actuarial losses | 294 | 235 |
Plan amendment | 0 | 0 |
Benefits paid | (151) | (146) |
Benefit obligation at end of year | 2,845 | 2,588 | 2,371
Change in plan assets: |  |  |
Fair value of plan assets at beginning of year | 2,462 | 2,105 |
Actual return on plan assets | 345 | 485 |
Employer contribution | 19 | 18 |
Benefits paid | (151) | (146) |
Fair value of plan assets at end of year | 2,675 | 2,462 | 2,105
Funded status at end of year | (170) | (126) |
Other assets | 189 | 194 |
Other current liabilities | (19) | (18) |
Other liabilities | (340) | (302) |
Net amount recognized | (170) | (126) |
Net loss | 869 | 781 |
Prior service cost (benefit) | 0 | 1 |
OPEB |  |  |
Change in benefit obligations: |  |  |
Benefit obligation at beginning of year | 457 | 466 |
Service cost | 6 | 6 | 7
Interest cost | 12 | 17 | 15
Actuarial losses | 35 | 28 |
Plan amendment | 0 | (18) |
Benefits paid | (39) | (42) |
Benefit obligation at end of year | 471 | 457 | 466
Change in plan assets: |  |  |
Fair value of plan assets at beginning of year | 170 | 158 |
Actual return on plan assets | 21 | 34 |
Employer contribution | 13 | 20 |
Benefits paid | (39) | (42) |
Fair value of plan assets at end of year | 165 | 170 | $ 158
Funded status at end of year | (306) | (287) |
Other assets | 0 | 0 |
Other current liabilities | 0 | 0 |
Other liabilities | (306) | (287) |
Net amount recognized | (306) | (287) |
Net loss | 57 | 29 |
Prior service cost (benefit) | $ (228) | $ (253) |

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