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Pension, Other Postretirement Benefits and Savings Plans - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items] |  |  |
Weighted average discount rate | 1.70% | 2.30% |
Defined contribution plans, contribution expenses | $ 100 | $ 110 | $ 111
Maximum |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Expected contribution to funded non-U.S. pension plans in next year | 50 |  |
Minimum |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Expected contribution to funded non-U.S. pension plans in next year | 25 |  |
United States |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Accumulated benefit obligation | $ 5,220 | 4,994 |
United States | Private Equity and Private Credit Securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target asset allocation | 6.00% |  |
United States | Fixed Income Securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target asset allocation | 94.00% |  |
Non-U.S. |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Accumulated benefit obligation | $ 3,284 | 3,097 |
Non-U.S. | Fixed Income Securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target asset allocation | 95.00% |  |
Non-U.S. | Equity securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target asset allocation | 5.00% |  |
Non-U.S. | Unfunded Plan |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Accumulated benefit obligation | $ 264 | 247 |
Pension benefit obligation | 299 | 277 |
AOCL adjustment | 90 | 82 |
Pension Plan | United States |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Settlement charges | 28 |  |
Curtailment credit (charge) and special termination benefits |  | 5 |
Settlement payments | 56 | 15 |
Service cost | 4 | 3 | 4
Benefits cost | 77 | 73 | $ 62
Postretirement benefits funded status | $ 265 | $ 229 |
Weighted average discount rate | 2.66% | 3.85% | 3.09%
Assumed weighted average long term rate of return | 4.22% | 5.25% | 4.58%
Pension benefit obligation | $ 5,235 | $ 5,009 | $ 4,734
AOCL adjustment | 2,350 | 2,377 |
Pension Plan | United States | Other (Income) Expense |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Settlement charges | 24 | 6 | 8
Pension Plan | United States | Rationalizations |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Settlement charges | 4 |  |
Pension Plan | Non-U.S. |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Settlement payments | 8 | 5 |
Service cost | 30 | 26 | 28
Increase (decrease) for plan amendment | 3 | (2) |
Benefits cost | 67 | 70 | $ 69
Postretirement benefits funded status | $ 341 | $ 455 |
Weighted average discount rate | 2.26% | 2.84% | 2.56%
Assumed weighted average long term rate of return | 2.52% | 2.95% | 3.02%
Pension benefit obligation | $ 3,382 | $ 3,195 | $ 2,774
AOCL adjustment | 661 | 807 |
Pension Plan | Non-U.S. | Other (Income) Expense |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Curtailment credit (charge) | 6 |  |
Pension Plan | United Kingdom |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Settlement charges |  |  | 13
Service cost |  |  | 16
Pension Plan | United Kingdom | Other (Income) Expense |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Settlement payments |  |  | 103
Pension Plan | BRAZIL |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Increase (decrease) for plan amendment |  |  | 16
Other Postretirement Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Service cost | 2 | 2 | 3
Benefits cost | 1 | 7 | 11
Prescription drug subsidy (less than) | 1 |  |
Postretirement benefits funded status | 236 | 241 |
Pension benefit obligation | 236 | 241 | 234
AOCL adjustment | 23 | 7 |
Other Postretirement Benefits | United States |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Curtailment credit (charge) | 4 |  |
Termination benefit charge | 5 |  |
Benefits cost | 1 | 3 | $ 4
Postretirement benefits funded status | $ 106 | $ 106 |
Weighted average discount rate | 2.68% | 3.79% | 2.99%
Other Postretirement Benefits | Non-U.S. |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Benefits cost | $ 0 | $ 4 | $ 7
Postretirement benefits funded status | $ 130 | $ 135 |
Weighted average discount rate | 5.68% | 6.25% | 6.13%
Other Postretirement Benefits | BRAZIL |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Increase (decrease) for plan amendment |  |  | $ (14)

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