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Pensions and Other Postretirement Benefits - Schedule of Pension and Postretirement Benefit Cost Components (Details) - USD ($)
$ in Millions
 3 Months Ended 5 Months Ended 9 Months Ended
Sep. 30, 2024
Jun. 30, 2024
Sep. 30, 2023
May 31, 2024
Sep. 30, 2024
Sep. 30, 2023
Pension Benefits            
Defined Benefit Plan Disclosure [Line Items]            
Service cost $ 7   $ 7   $ 20 $ 19
Interest cost 26   27   80 81
Expected return on plan assets (51)   (53)   (153) (157)
Amortization of net losses 4   1   12 3
Amortization of prior service benefit 0   0   0 0
Curtailment gain       $ 0 0 0
Net benefit (14)   (18)   (41) (54)
Other Postretirement Benefits            
Defined Benefit Plan Disclosure [Line Items]            
Service cost 0   1   2 3
Interest cost 4   4   11 13
Expected return on plan assets (2)   (2)   (8) (8)
Amortization of net losses 0   (1)   0 (1)
Amortization of prior service benefit (6)   (6)   (18) (19)
Curtailment gain   $ (20)     (20) 0
Net benefit $ (4)   $ (4)   $ (33) $ (12)