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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 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
May 31, 2024
Jun. 30, 2025
Jun. 30, 2024
Pension Benefits          
Defined Benefit Plan Disclosure [Line Items]          
Service cost $ 6 $ 7   $ 12 $ 13
Interest cost 27 27   53 54
Expected return on plan assets (49) (51)   (98) (102)
Amortization of net losses 5 4   11 8
Amortization of prior service benefit 0 0   0 0
Curtailment gain 0 0 $ 0 0 0
Net benefit (11) (13)   (22) (27)
Other Postretirement Benefits          
Defined Benefit Plan Disclosure [Line Items]          
Service cost 0 1   1 2
Interest cost 4 4   7 7
Expected return on plan assets (3) (3)   (5) (6)
Amortization of net losses 0 0   0 0
Amortization of prior service benefit (5) (6)   (11) (12)
Curtailment gain 0 (20)   0 (20)
Net benefit $ (4) $ (24)   $ (8) $ (29)