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Benefit Plans - Schedule of Components of Net Cost (Benefit) for Pension and Other Postretirement Plans (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Components of net periodic cost      
Service cost $ 107 $ 80 $ 133
Interest cost 243 239 249
Expected return on plan assets (313) (306) (306)
Amortization of prior service credit (1) (1) (21)
Costs and expenses 36 12 55
Remeasurement of benefit obligation 96 (129) 121
Remeasurement of plan assets (131) 92 (112)
Remeasurement (gains) losses (35) (37) 9
Total net (benefit) cost 1 (25) 64
Pension benefits      
Components of net periodic cost      
Service cost 107 80 132
Interest cost 235 230 239
Expected return on plan assets (313) (306) (306)
Amortization of prior service credit 0 0 0
Costs and expenses 29 4 65
Remeasurement of benefit obligation 101 (125) 125
Remeasurement of plan assets (131) 92 (112)
Remeasurement (gains) losses (30) (33) 13
Total net (benefit) cost (1) (29) 78
Service cost, refund   38  
Postretirement benefits      
Components of net periodic cost      
Service cost 0 0 1
Interest cost 8 9 10
Expected return on plan assets 0 0 0
Amortization of prior service credit (1) (1) (21)
Costs and expenses 7 8 (10)
Remeasurement of benefit obligation (5) (4) (4)
Remeasurement of plan assets 0 0 0
Remeasurement (gains) losses (5) (4) (4)
Total net (benefit) cost $ 2 $ 4 $ (14)