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Pension and Other Postretirement Benefits (Components of Net Periodic Benefit Costs) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Pension Benefits        
Components of net periodic benefit cost:        
Service cost $ 57 $ 53 $ 112 $ 107
Interest cost 35 31 72 61
Expected return on plan assets (35) (37) (72) (74)
Amortization of prior service credit (2) (8) (4) (16)
Amortization of actuarial loss 4 1 8 2
Settlement loss 1 0 1 0
Net periodic benefit cost 60 40 117 80
Other Benefits        
Components of net periodic benefit cost:        
Service cost 5 5 10 10
Interest cost 8 8 17 16
Amortization of prior service credit (5) (6) (11) (11)
Net periodic benefit cost $ 8 $ 7 $ 16 $ 15