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Pensions and Other Postretirement Benefits - Schedule of Pension and Postretirement Benefit Cost Components (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Pension Benefits        
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 7 $ 6 $ 13 $ 12
Interest cost 27 27 54 54
Expected return on plan assets (51) (52) (102) (104)
Amortization of net losses 4 1 8 2
Amortization of prior service benefit 0 0 0 0
Curtailment gain 0 0 0 0
Net benefit (13) (18) (27) (36)
Other Postretirement Benefits        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 1 1 2 2
Interest cost 4 5 7 9
Expected return on plan assets (3) (3) (6) (6)
Amortization of net losses 0 0 0 0
Amortization of prior service benefit (6) (7) (12) (13)
Curtailment gain (20) 0 (20) 0
Net benefit $ (24) $ (4) $ (29) $ (8)