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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
Mar. 31, 2025
Mar. 31, 2024
Defined Benefit Plan Disclosure    
Service cost $ 1 $ 1
Interest cost 4 3
Expected return on plan assets (6) (5)
Amortization of actuarial gain and prior service cost (1) 0
Total non-service benefit (3) (2)
Net periodic benefit cost $ (2) $ (1)