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Post-retirement Benefit Plans - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block        
Employer contribution to defined benefit plan     $ 18 $ 16
Maximum        
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block        
Other postretirement benefit expense $ 1 $ 1 1 1
Amortization of net actuarial loss 1 $ 1 1 $ 1
Additional contributions 6   6  
Minimum        
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block        
Additional contributions $ 2   $ 2