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Pensions and Other Postretirement Benefits - Schedule of Pension and Postretirement Benefit Cost Components (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Pension Benefits    
Defined Benefit Plan Disclosure [Line Items]    
Service cost $ 6 $ 6
Interest cost 26 27
Expected return on plan assets (49) (51)
Amortization of net losses 6 4
Amortization of prior service benefit 0 0
Net benefit (11) (14)
Other Postretirement Benefits    
Defined Benefit Plan Disclosure [Line Items]    
Service cost 1 1
Interest cost 3 3
Expected return on plan assets (2) (3)
Amortization of net losses 0 0
Amortization of prior service benefit (6) (6)
Net benefit $ (4) $ (5)