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Employee Benefit Obligations - Funded Status of Plans (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Defined Benefit Pension Plans |  |  |
Change in projected benefit obligation: |  |  |
Benefit obligation at prior year end | $ 5,570.0 | $ 6,493.0 |
Service cost | 61.0 | 65.0 | $ 66.0
Interest cost | 173.0 | 171.0 | 216.0
Benefits paid | (396.0) | (385.0) |
Net actuarial (gain) loss | 715.0 | (399.0) |
Curtailments and settlements including special termination benefits | (34.0) | (252.0) |
Plan amendments |  | 52.0 |
Other | 1.0 | 2.0 |
Effect of exchange rates and other | 107.0 | (177.0) |
Benefit obligation at year end | 6,197.0 | 5,570.0 | 6,493.0
Change in plan assets: |  |  |
Fair value of plan assets at prior year end | 5,175.0 | 6,052.0 |
Actual return on plan assets | 624.0 | (116.0) |
Employer contributions | 192.0 | 38.0 |
Contributions to unfunded plans | 24.0 | 27.0 |
Benefits paid | 396.0 | 385.0 |
Curtailment and settlement losses including special termination benefits | (34.0) | (256.0) |
Other |  | 10.0 |
Effect of exchange rates | 131.0 | (195.0) |
Fair value of plan assets at end of year | 5,716.0 | 5,175.0 | 6,052.0
Funded status | (481.0) | (395.0) |
Amounts recognized in accumulated other comprehensive (earnings) loss |  |  |
Net actuarial (loss) gain | (714.0) | (423.0) |
Net prior service (cost) credit | (34.0) | (34.0) |
Tax effect and currency exchange rates | 190.0 | 180.0 |
Accumulated other comprehensive (earnings) loss | (558.0) | (277.0) |
Benefit plans with an accumulated benefit obligation in excess of plan assets |  |  |
Projected benefit obligation | 3,177.0 | 2,933.0 |
Accumulated benefit obligation | 3,093.0 | 2,870.0 |
Fair value of plan assets | 2,259.0 | 1,980.0 |
Defined Benefit Pension Plans | US Plan |  |  |
Change in projected benefit obligation: |  |  |
Benefit obligation at prior year end | 2,579.0 | 3,061.0 |
Service cost | 50.0 | 51.0 | 49.0
Interest cost | 101.0 | 99.0 | 124.0
Benefits paid | (205.0) | (191.0) |
Net actuarial (gain) loss | 324.0 | (189.0) |
Curtailments and settlements including special termination benefits |  | (252.0) |
Benefit obligation at year end | 2,849.0 | 2,579.0 | 3,061.0
Change in plan assets: |  |  |
Fair value of plan assets at prior year end | 1,901.0 | 2,420.0 |
Actual return on plan assets | 313.0 | (119.0) |
Employer contributions | 188.0 | 32.0 |
Contributions to unfunded plans | 6.0 | 7.0 |
Benefits paid | 205.0 | 191.0 |
Curtailment and settlement losses including special termination benefits |  | (256.0) |
Other | (1.0) | 8.0 |
Fair value of plan assets at end of year | 2,202.0 | 1,901.0 | 2,420.0
Funded status | (647.0) | (678.0) |
Amounts recognized in accumulated other comprehensive (earnings) loss |  |  |
Net actuarial (loss) gain | (683.0) | (563.0) |
Net prior service (cost) credit | 15.0 | 16.0 |
Tax effect and currency exchange rates | 174.0 | 216.0 |
Accumulated other comprehensive (earnings) loss | (494.0) | (331.0) |
Accumulated benefit obligation | 2,769.0 | 2,519.0 |
Benefit plans with an accumulated benefit obligation in excess of plan assets |  |  |
Projected benefit obligation | 2,849.0 | 2,579.0 |
Accumulated benefit obligation | 2,769.0 | 2,519.0 |
Fair value of plan assets | 2,202.0 | 1,901.0 |
Defined Benefit Pension Plans | Foreign |  |  |
Change in projected benefit obligation: |  |  |
Benefit obligation at prior year end | 2,991.0 | 3,432.0 |
Service cost | 11.0 | 14.0 | 17.0
Interest cost | 72.0 | 72.0 | 92.0
Benefits paid | (191.0) | (194.0) |
Net actuarial (gain) loss | 391.0 | (210.0) |
Curtailments and settlements including special termination benefits | (34.0) |  |
Plan amendments |  | 52.0 |
Other | 1.0 | 2.0 |
Effect of exchange rates and other | 107.0 | (177.0) |
Benefit obligation at year end | 3,348.0 | 2,991.0 | 3,432.0
Change in plan assets: |  |  |
Fair value of plan assets at prior year end | 3,274.0 | 3,632.0 |
Actual return on plan assets | 311.0 | 3.0 |
Employer contributions | 4.0 | 6.0 |
Contributions to unfunded plans | 18.0 | 20.0 |
Benefits paid | 191.0 | 194.0 |
Curtailment and settlement losses including special termination benefits | (34.0) |  |
Other | 1.0 | 2.0 |
Effect of exchange rates | 131.0 | (195.0) |
Fair value of plan assets at end of year | 3,514.0 | 3,274.0 | $ 3,632.0
Funded status | 166.0 | 283.0 |
Amounts recognized in accumulated other comprehensive (earnings) loss |  |  |
Net actuarial (loss) gain | (31.0) | 140.0 |
Net prior service (cost) credit | (49.0) | (50.0) |
Tax effect and currency exchange rates | 16.0 | (36.0) |
Accumulated other comprehensive (earnings) loss | (64.0) | 54.0 |
Accumulated benefit obligation | 3,345.0 | 2,988.0 |
Benefit plans with an accumulated benefit obligation in excess of plan assets |  |  |
Projected benefit obligation | 328.0 | 354.0 |
Accumulated benefit obligation | 324.0 | 351.0 |
Fair value of plan assets | 57.0 | 79.0 |
Defined Benefit Pension Plans | U.K. |  |  |
Change in plan assets: |  |  |
Fair value of plan assets at prior year end | 3,195.0 |  |
Fair value of plan assets at end of year | 3,457.0 | 3,195.0 |
Unfunded Plan | German, Swedish And U.S. |  |  |
Benefit plans with an accumulated benefit obligation in excess of plan assets |  |  |
Fair value of plan assets | $ 0.0 | $ 0.0 |

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