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Post-Retirement and Similar Obligations - Estimated Future Benefit Payments (Details)
$ in Millions
Dec. 31, 2023
USD ($)
Pension Benefits  
Defined Benefit Plan Disclosure [Line Items]  
2024 $ 235
2025 221
2026 216
2027 210
2028 204
2029 - 2033 918
Postretirement Benefits  
Defined Benefit Plan Disclosure [Line Items]  
2024 28
2025 28
2026 27
2027 26
2028 25
2029 - 2033 109
Medicare Act Subsidy Receipts  
Defined Benefit Plan Disclosure [Line Items]  
2024 0
2025 0
2026 0
2027 0
2028 0
2029 - 2033 $ 2