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Pension and Other Postretirement Benefit Plans - Summary of Expected Benefit Payments (Details)
$ in Millions
Dec. 31, 2024
USD ($)
Other Postretirement Benefits  
Defined Benefit Plan Disclosure [Line Items]  
2025 $ 86
2026 87
2027 89
2028 91
2029 96
2030 — 2034 515
United States | Pension Benefits  
Defined Benefit Plan Disclosure [Line Items]  
2025 771
2026 775
2027 789
2028 799
2029 822
2030 — 2034 4,386
International | Pension Benefits  
Defined Benefit Plan Disclosure [Line Items]  
2025 291
2026 275
2027 286
2028 300
2029 314
2030 — 2034 $ 1,792