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Benefit Plans - Future Benefit Payments for Postretirement Health Care Plans (Details) - Postretirement Health Care Plan
$ in Millions
Dec. 31, 2019
USD ($)
U.S. Plans  
Defined Benefit Plan Disclosure [Line Items]  
2020 $ 11
2021 12
2022 13
2023 14
2024 15
2025-2029 74
Non-U.S. Plans  
Defined Benefit Plan Disclosure [Line Items]  
2020 5
2021 5
2022 5
2023 6
2024 6
2025-2029 $ 32