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Pension and Other Postretirement Benefit Plans - Summary of Expected Benefit Payments (Details)
$ in Millions
Dec. 31, 2021
USD ($)
Other Postretirement Benefits  
Defined Benefit Plan Disclosure [Line Items]  
2022 $ 84
2023 85
2024 87
2025 89
2026 90
2027 — 2031 469
United States | Pension Benefits  
Defined Benefit Plan Disclosure [Line Items]  
2022 724
2023 745
2024 731
2025 748
2026 770
2027 — 2031 4,230
International | Pension Benefits  
Defined Benefit Plan Disclosure [Line Items]  
2022 289
2023 275
2024 278
2025 280
2026 308
2027 — 2031 $ 1,715