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Pensions and Other Postretirement Benefits - Benefit Cost Components (Details) - USD ($)
$ in Millions
 5 Months Ended 12 Months Ended
May 31, 2024
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Pension Benefits        
Defined Benefit Plan Disclosure [Line Items]        
Service cost   $ 26 $ 25 $ 40
Interest cost   107 108 67
Expected return on plan assets   (203) (208) (213)
Amortization of net (losses) gains   17 4 49
Amortization of prior service benefit   (1) (1) 0
Curtailment gain $ 0      
Net cost (benefit)   (54) (72) (57)
Other Postretirement Benefits        
Defined Benefit Plan Disclosure [Line Items]        
Service cost   4 4 6
Interest cost   15 17 9
Expected return on plan assets   (11) (11) (13)
Amortization of net (losses) gains   (1) 0 0
Amortization of prior service benefit   (23) (26) (25)
Curtailment gain   (20) 0 0
Net cost (benefit)   $ (36) $ (16) $ (23)