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Employee Retirement Benefits - Components of Net Periodic Costs for Qualified and Supplemental Pension Plans (Details) - Qualified Pension Plans - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Defined Benefit Plan Disclosure        
Service cost $ 2 $ 1 $ 4 $ 4
Interest cost 3 4 10 10
Expected return on plan assets (6) (5) (17) (16)
Amortization of actuarial (gain) loss and prior service cost 0 0 (2) 1
Total non-service benefit (3) (1) (9) (5)
Net periodic benefit cost $ (1) $ 0 $ (5) $ (1)