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Postretirement Benefit Plans - Assumed Future Benefits Payments (Details)
$ in Millions
Dec. 31, 2019
USD ($)
U.S. | Defined benefit plan  
Defined Benefit Plan Disclosure [Line Items]  
2020 $ 99
2021 118
2022 85
2023 90
2024 87
2025 - 2029 441
U.S. | Retiree health care plan  
Defined Benefit Plan Disclosure [Line Items]  
2020 32
2021 30
2022 29
2023 27
2024 26
2025 - 2029 115
Non-U.S. | Defined benefit plan  
Defined Benefit Plan Disclosure [Line Items]  
2020 95
2021 96
2022 99
2023 100
2024 104
2025 - 2029 $ 542