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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 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Defined Benefit Plan Disclosure [Line Items]        
Interest cost $ 19 $ 19 $ 39 $ 38
Expected return on plan assets (26) (25) (52) (50)
Amortization of net gain (1) (1) (3) (3)
Net periodic benefit credit $ (8) $ (7) $ (16) $ (15)