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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, 2025
Sep. 30, 2024
Jun. 30, 2024
May 31, 2024
Sep. 30, 2025
Sep. 30, 2024
Pension Benefits            
Defined Benefit Plan Disclosure [Line Items]            
Service cost $ 6 $ 7     $ 18 $ 20
Interest cost 27 26     80 80
Expected return on plan assets (49) (51)     (147) (153)
Amortization of net losses (gains) 6 4     17 12
Amortization of prior service benefit 0 0     0 0
Curtailment gain       $ 0 0 0
Net benefit (10) (14)     (32) (41)
Other Postretirement Benefits            
Defined Benefit Plan Disclosure [Line Items]            
Service cost 1 0     2 2
Interest cost 3 4     10 11
Expected return on plan assets (2) (2)     (7) (8)
Amortization of net losses (gains) (1) 0     (1) 0
Amortization of prior service benefit (5) (6)     (16) (18)
Curtailment gain     $ (20)   0 (20)
Net benefit $ (4) $ (4)     $ (12) $ (33)