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Retirement and Other Postretirement Benefits - Schedule of Funding and Cash Flows and Defined Contribution Plans (Details)
$ in Millions
Dec. 31, 2025
USD ($)
Pension benefits  
Defined Benefit Plan, Expected Future Benefit Payment [Abstract]  
2026 $ 119
2027 117
2028 117
2029 115
2030 119
2031 - 2035 541
Total benefit payments 1,128
Other postretirement benefits  
Defined Benefit Plan, Expected Future Benefit Payment [Abstract]  
2026 5
2027 5
2028 4
2029 4
2030 4
2031 - 2035 18
Total benefit payments $ 40