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Pension and Other Postretirement Benefits - Periodic Benefit Cost (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Pension        
Components of net periodic benefit cost:        
Service cost $ 8 $ 9 $ 24 $ 27
Interest cost 23 23 69 69
Expected return on plan assets (33) (34) (97) (100)
Amortization of actuarial loss (gain) 1 1 3 5
Amortization of prior service cost 1 1 1 1
Settlements 0 0 1 0
Total net periodic benefit cost (income) 0 0 1 2
Other Postretirement Benefits        
Components of net periodic benefit cost:        
Service cost 1 1 3 3
Interest cost 6 6 18 18
Expected return on plan assets (6) (5) (19) (16)
Amortization of actuarial loss (gain) (3) (1) (7) (2)
Amortization of prior service cost 0 0 0 0
Settlements 0 0 0 0
Total net periodic benefit cost (income) $ (2) $ 1 $ (5) $ 3