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Pension, Savings and Other Postretirement Benefit Plans - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2021 | Mar. 31, 2020
Defined Benefit Plan Disclosure [Line Items] |  |
Postretirement benefits expense (credit) | $ 2 | $ (3)
Defined contribution plans, contribution expenses | 28 | 30
U.S. |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Net periodic cost | 7 | 13
Non-U.S. |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Net periodic cost | 16 | 19
Contributions to pension plans | 2 |
Minimum | Non-U.S. |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Expected contribution to funded pension plans in current year | 25 |
Maximum | Non-U.S. |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Expected contribution to funded pension plans in current year | $ 50 |
Pension Plan | Other (Income) Expense |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Pension settlement charges |  | 2
Other Postretirement Benefits Plan |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Curtailment credit (charge) |  | $ 4

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