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Pension and Other Postretirement Benefits - Schedule of Obligations and Funded Status (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Pension benefits |  |  |
Change in benefit obligation |  |  |
Benefit obligation at beginning of year | $ 7,359 | $ 7,026 |
Service cost | 46 | 90 | $ 155
Interest cost | 219 | 234 | 431
Amendments | 18 | 1 |
Actuarial (gains) losses | (372) | 311 |
Settlements | (146) | 0 |
Curtailments | (154) | 0 |
Benefits paid | (422) | (425) |
Medicare Part D subsidy receipts | 0 | 0 |
Foreign currency translation impact | (72) | 122 |
Benefit obligation at end of year | 6,476 | 7,359 | 7,026
Change in plan assets |  |  |
Fair value of plan assets at beginning of year | 4,862 | 4,666 |
Actual return on plan assets | (144) | 212 |
Employer contributions | 298 | 310 |
Benefits paid | (397) | (404) |
Administrative expenses | (33) | (33) |
Settlements | (178) | 0 |
Foreign currency translation impact | (74) | 111 |
Fair value of plan assets at end of year | 4,334 | 4,862 | 4,666
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract] |  |  |
Net funded status | (2,142) | (2,497) |
Amounts recognized in the Consolidated Balance Sheet consist of: |  |  |
Noncurrent assets | 111 | 89 |
Current liabilities | (23) | (22) |
Noncurrent liabilities | (2,230) | (2,564) |
Net amount recognized | (2,142) | (2,497) |
Amounts recognized in Accumulated Other Comprehensive Loss consist of: |  |  |
Net actuarial loss | 2,957 | 3,240 |
Prior service cost (benefit) | 3 | 10 |
Net amount recognized, before tax effect | 2,960 | 3,250 |
Other changes in plan assets and benefit obligations recognized in Other Comprehensive Loss consist of: |  |  |
Net actuarial (gain) loss | (19) | 481 |
Amortization of accumulated net actuarial loss | (264) | (220) |
Prior service cost (benefit) | 19 | 0 |
Amortization of prior service (cost) benefit | (26) | (5) |
Net amount recognized, before tax effect | (290) | 256 |
Other postretirement benefits |  |  |
Change in benefit obligation |  |  |
Benefit obligation at beginning of year | 927 | 980 |
Service cost | 7 | 7 | 13
Interest cost | 28 | 30 | 63
Amendments | (25) | 0 |
Actuarial (gains) losses | (51) | 1 |
Settlements | 0 | 0 |
Curtailments | 0 | 0 |
Benefits paid | (86) | (98) |
Medicare Part D subsidy receipts | 6 | 7 |
Foreign currency translation impact | 0 | 0 |
Benefit obligation at end of year | 806 | 927 | 980
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 | (806) | (927) |
Amounts recognized in the Consolidated Balance Sheet consist of: |  |  |
Noncurrent assets | 0 | 0 |
Current liabilities | (83) | (86) |
Noncurrent liabilities | (723) | (841) |
Net amount recognized | (806) | (927) |
Amounts recognized in Accumulated Other Comprehensive Loss consist of: |  |  |
Net actuarial loss | 87 | 146 |
Prior service cost (benefit) | (27) | (37) |
Net amount recognized, before tax effect | 60 | 109 |
Other changes in plan assets and benefit obligations recognized in Other Comprehensive Loss consist of: |  |  |
Net actuarial (gain) loss | (52) | 1 |
Amortization of accumulated net actuarial loss | (7) | (5) |
Prior service cost (benefit) | (25) | 0 |
Amortization of prior service (cost) benefit | 35 | 8 |
Net amount recognized, before tax effect | (49) | 4 |
United States | Pension benefits |  |  |
Change in benefit obligation |  |  |
Benefit obligation at beginning of year | 6,018 |  |
Benefit obligation at end of year | 5,282 | 6,018 |
Change in plan assets |  |  |
Fair value of plan assets at beginning of year | 3,544 |  |
Fair value of plan assets at end of year | 3,123 | 3,544 |
Other changes in plan assets and benefit obligations recognized in Other Comprehensive Loss consist of: |  |  |
Funded status for U.S. pension plans | $ (2,159) | $ (2,474) |

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