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Employee Benefits - Net Periodic Benefit (Income) Expense (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Combined Pension Plan        
Components of net periodic (benefit) expense        
Service cost $ 5 $ 6 $ 16 $ 18
Interest cost 61 63 181 188
Expected return on plan assets (64) (68) (191) (204)
Recognition of prior service credit 0 (3) (1) (6)
Recognition of actuarial (gain) loss 36 28 108 82
Net periodic expense 38 26 113 78
Post-Retirement Benefit Plans        
Components of net periodic (benefit) expense        
Service cost 0 1 2 3
Interest cost 22 23 66 70
Recognition of prior service credit (3) (1) (6) (5)
Recognition of actuarial (gain) loss (6) (4) (19) (13)
Special termination benefits charge 0 0 0 2
Net periodic expense $ 13 $ 19 $ 43 $ 57