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Employee Benefit Plans - PAC - Contributions and Benefit Payments (Details)
$ in Millions
Dec. 31, 2023
USD ($)
Other Postretirement  
Defined Benefit Plan Disclosure [Line Items]  
2024 $ 54
2025 54
2026 53
2027 54
2028 52
2029-2033 231
Other Postretirement | PAC  
Defined Benefit Plan Disclosure [Line Items]  
Projected benefit payments 0
2024 22
2025 22
2026 21
2027 20
2028 19
2029-2033 81
U.S. | Pension  
Defined Benefit Plan Disclosure [Line Items]  
Projected benefit payments 13
2024 187
2025 183
2026 181
2027 175
2028 169
2029-2033 774
U.S. | Pension | PAC  
Defined Benefit Plan Disclosure [Line Items]  
Projected benefit payments 4
2024 76
2025 72
2026 70
2027 66
2028 63
2029-2033 273
U.S. | Other Postretirement  
Defined Benefit Plan Disclosure [Line Items]  
Projected benefit payments $ 5