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Pension and Postretirement Benefit Plans and Defined Contribution Plans - Expected Future Cash Flow Information (Details)
$ in Millions
Dec. 31, 2023
USD ($)
Postretirement Plans [Member]  
Defined Benefit Plan Disclosure [Line Items]  
Expected contributions in 2024 $ 39
Expected benefit payments:  
2024 43
2025 45
2026 46
2027 47
2028 47
2029–2033 218
U.S. [Member] | Pension Plans [Member]  
Defined Benefit Plan Disclosure [Line Items]  
Expected contributions in 2024 94
Expected benefit payments:  
2024 1,009
2025 907
2026 894
2027 875
2028 858
2029–2033 4,004
International [Member] | Pension Plans [Member]  
Defined Benefit Plan Disclosure [Line Items]  
Expected contributions in 2024 162
Expected benefit payments:  
2024 372
2025 361
2026 371
2027 384
2028 386
2029–2033 $ 2,073