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Postretirement Benefit Plans - Assumed Future Benefits Payments (Details)
$ in Millions
Dec. 31, 2020
USD ($)
U.S. | Defined benefit plan  
Defined Benefit Plan Disclosure [Line Items]  
2021 $ 95
2022 137
2023 102
2024 100
2025 102
2026 - 2030 490
U.S. | Retiree health care plan  
Defined Benefit Plan Disclosure [Line Items]  
2021 29
2022 28
2023 27
2024 26
2025 25
2026 - 2030 113
Non-U.S. | Defined benefit plan  
Defined Benefit Plan Disclosure [Line Items]  
2021 99
2022 102
2023 102
2024 105
2025 106
2026 - 2030 $ 558