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Retirement and Postretirement Plans - Summary of Components of Net Periodic Benefit Cost (Credit) for Plans (Details) - Pension Benefit Plans [Member] - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Defined Benefit Plan Disclosure [Line Items]        
Service cost     $ 1 $ 1
Interest cost $ 20 $ 21 58 62
Expected return on plan assets (25) (28) (75) (84)
Amortization of net gain (1) (2) (4) (6)
Net periodic benefit credit $ (6) $ (9) $ (20) $ (27)