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Pension and Other Postretirement Employee Benefit Plans (Benefit Payments that Reflect Expected Future Service) (Details)
$ in Millions
Dec. 31, 2023
USD ($)
Defined Benefit Plan Disclosure [Line Items]  
2024 $ 244
2025 249
2026 246
2027 249
2028 245
2029 - 2033 1,094
Pension Benefits | U.S. Pension Benefits  
Defined Benefit Plan Disclosure [Line Items]  
2024 175
2025 174
2026 173
2027 173
2028 170
2029 - 2033 697
Pension Benefits | Foreign Plan  
Defined Benefit Plan Disclosure [Line Items]  
2024 56
2025 63
2026 62
2027 66
2028 66
2029 - 2033 358
Postretirement Benefits  
Defined Benefit Plan Disclosure [Line Items]  
2024 13
2025 12
2026 11
2027 10
2028 9
2029 - 2033 $ 39