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Pensions and Other Postretirement Benefits - Estimated Future Benefit Payments (Details)
$ in Millions
Dec. 31, 2023
USD ($)
Pension Benefits  
Defined Benefit Plan Disclosure [Line Items]  
2024 $ 151
2025 149
2026 148
2027 148
2028 148
Years 2029 – 2033 743
Other Postretirement Benefits  
Defined Benefit Plan Disclosure [Line Items]  
2024 31
2025 30
2026 29
2027 28
2028 27
Years 2029 – 2033 $ 127