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Benefit Plans - Estimated Future Minimum Benefit Payments (Details)
$ in Millions
Dec. 31, 2023
USD ($)
Pension Benefits  
Defined Benefit Plan, Expected Future Benefit Payment [Abstract]  
2024 $ 190
2025 183
2026 178
2027 180
2028 174
2029 – 2033 752
Defined Benefit Plan, Expected Future Employer Contributions [Abstract]  
Expected contributions in 2024 16
Other Postretirement Benefits  
Defined Benefit Plan, Expected Future Benefit Payment [Abstract]  
2024 4
2025 3
2026 3
2027 3
2028 3
2029 – 2033 10
Postretirement Healthcare and Life Insurance Benefit Plans  
Defined Benefit Plan, Expected Future Employer Contributions [Abstract]  
Expected contributions in 2024 $ 1