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Pension and Other Postretirement Benefits - Schedule of Pension and Other Postretirement Benefit Costs (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Pension    
Components of net periodic benefit cost:    
Service cost $ 7 $ 8
Interest cost 21 23
Expected return on plan assets (32) (32)
Amortization of actuarial loss (gain) 4 1
Total net periodic benefit cost (income) 0 0
Other Postretirement Benefits    
Components of net periodic benefit cost:    
Service cost 1 1
Interest cost 5 6
Expected return on plan assets (7) (7)
Amortization of actuarial loss (gain) (2) (2)
Total net periodic benefit cost (income) $ (3) $ (2)