v3.25.2
Benefit Plans - Schedule of Components of Net Cost (Benefit) for Pension and Other Postretirement Plans (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Defined Benefit Plan Disclosure [Line Items]        
Costs and expenses $ 9 $ (23) $ 18 $ (7)
Remeasurement (gains) losses 0 (9) 78 (11)
Total net cost (benefit) 9 (32) 96 (18)
Pension benefits        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 26 (7) 51 26
Interest cost 59 58 119 116
Expected return on plan assets (78) (76) (156) (153)
Costs and expenses 7 (25) 14 (11)
Remeasurement of projected benefit obligation 55 (68) 108 (93)
Remeasurement of plan assets (54) 60 (31) 85
Remeasurement (gains) losses 1 (8) 77 (8)
Total net cost (benefit) 8 (33) 91 (19)
Postretirement benefits        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 0 0 0 0
Interest cost 2 3 4 5
Amortization of prior service credit 0 (1) 0 (1)
Costs and expenses 2 2 4 4
Remeasurement of projected benefit obligation (1) (1) 1 (3)
Remeasurement of plan assets 0 0 0 0
Remeasurement (gains) losses (1) (1) 1 (3)
Total net cost (benefit) $ 1 $ 1 $ 5 $ 1