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Pension and Other Postretirement Benefit Plans - Summary of Expected Benefit Payments (Details)
$ in Millions
Dec. 31, 2020
USD ($)
Other Postretirement Benefits  
Defined Benefit Plan Disclosure [Line Items]  
2021 $ 85
2022 86
2023 87
2024 89
2025 91
2026 — 2030 474
United States | Pension Benefits  
Defined Benefit Plan Disclosure [Line Items]  
2021 816
2022 786
2023 781
2024 772
2025 782
2026 — 2030 4,271
International | Pension Benefits  
Defined Benefit Plan Disclosure [Line Items]  
2021 274
2022 277
2023 284
2024 285
2025 287
2026 — 2030 $ 1,688