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Pension and Other Postretirement Benefits - Schedule of Obligations and Funded Status (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Pension benefits |  |  |
Change in benefit obligation |  |  |
Benefit obligation at beginning of year | $ 6,476 | $ 7,359 |
Service cost | 25 | 46 | $ 90
Interest cost | 235 | 219 | 234
Amendments | 0 | 18 |
Actuarial losses (gains) | 974 | (372) |
Settlements | (23) | (146) |
Curtailments | 0 | (154) |
Benefits paid | (477) | (422) |
Medicare Part D subsidy receipts | 0 | 0 |
Foreign currency translation impact | 39 | (72) |
Benefit obligation at end of year | 7,249 | 6,476 | 7,359
Change in plan assets |  |  |
Fair value of plan assets at beginning of year | 4,334 | 4,862 |
Actual return on plan assets | 731 | (144) |
Employer contributions | 268 | 298 |
Benefits paid | (453) | (397) |
Administrative expenses | (34) | (33) |
Settlements | (22) | (178) |
Foreign currency translation impact | 44 | (74) |
Fair value of plan assets at end of year | 4,868 | 4,334 | 4,862
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract] |  |  |
Net funded status | (2,381) | (2,142) |
Amounts recognized in the Consolidated Balance Sheet consist of: |  |  |
Noncurrent assets | 104 | 111 |
Current liabilities | (25) | (23) |
Noncurrent liabilities | (2,460) | (2,230) |
Net amount recognized | (2,381) | (2,142) |
Amounts recognized in Accumulated Other Comprehensive Loss consist of: |  |  |
Net actuarial loss | 3,375 | 2,957 |
Prior service cost (benefit) | 1 | 3 |
Net amount recognized, before tax effect | 3,376 | 2,960 |
Other changes in plan assets and benefit obligations recognized in Other Comprehensive Loss consist of: |  |  |
Net actuarial loss (gain) | 566 | (19) |
Amortization of accumulated net actuarial loss | (148) | (264) |
Prior service cost (benefit) | 0 | 19 |
Amortization of prior service (cost) benefit | (2) | (26) |
Net amount recognized, before tax effect | 416 | (290) |
Other postretirement benefits |  |  |
Change in benefit obligation |  |  |
Benefit obligation at beginning of year | 806 | 927 |
Service cost | 7 | 7 | 7
Interest cost | 28 | 28 | 30
Amendments | (78) | (25) |
Actuarial losses (gains) | 100 | (51) |
Settlements | 0 | 0 |
Curtailments | 0 | 0 |
Benefits paid | (82) | (86) |
Medicare Part D subsidy receipts | 5 | 6 |
Foreign currency translation impact | 0 | 0 |
Benefit obligation at end of year | 786 | 806 | 927
Change in plan assets |  |  |
Fair value of plan assets at beginning of year | 0 | 0 |
Actual return on plan assets | 0 | 0 |
Employer contributions | 0 | 0 |
Benefits paid | 0 | 0 |
Administrative expenses | 0 | 0 |
Settlements | 0 | 0 |
Foreign currency translation impact | 0 | 0 |
Fair value of plan assets at end of year | 0 | 0 | $ 0
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract] |  |  |
Net funded status | (786) | (806) |
Amounts recognized in the Consolidated Balance Sheet consist of: |  |  |
Noncurrent assets | 0 | 0 |
Current liabilities | (72) | (83) |
Noncurrent liabilities | (714) | (723) |
Net amount recognized | (786) | (806) |
Amounts recognized in Accumulated Other Comprehensive Loss consist of: |  |  |
Net actuarial loss | 179 | 87 |
Prior service cost (benefit) | (37) | (27) |
Net amount recognized, before tax effect | 142 | 60 |
Other changes in plan assets and benefit obligations recognized in Other Comprehensive Loss consist of: |  |  |
Net actuarial loss (gain) | 100 | (52) |
Amortization of accumulated net actuarial loss | (8) | (7) |
Prior service cost (benefit) | (78) | (25) |
Amortization of prior service (cost) benefit | 68 | 35 |
Net amount recognized, before tax effect | 82 | (49) |
United States | Pension benefits |  |  |
Change in benefit obligation |  |  |
Benefit obligation at beginning of year | 5,282 |  |
Benefit obligation at end of year | 5,884 | 5,282 |
Change in plan assets |  |  |
Fair value of plan assets at beginning of year | 3,123 |  |
Fair value of plan assets at end of year | 3,513 | 3,123 |
Other changes in plan assets and benefit obligations recognized in Other Comprehensive Loss consist of: |  |  |
Funded status for U.S. pension plans | $ (2,371) | $ (2,159) |

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