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Employee Benefit Plans - Schedule of Components of Pension and Other Postretirement Benefit Costs for Continuing Operation (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Mar. 31, 2025
Mar. 31, 2024
Defined Benefit Plan Disclosure [Line Items]        
Curtailment loss     $ 1  
Pension Plan [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 1 $ 1 2 $ 1
Interest cost 3 2 6 7
Expected return on plan assets (3) (1) (5) (4)
Curtailment loss     1 0
Total net periodic benefit costs 1 2 4 4
Other Postretirement Benefits Plan [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 0 0 0 0
Interest cost 1 1 1 1
Expected return on plan assets 0 0 0 0
Curtailment loss     0 0
Total net periodic benefit costs $ 1 $ 1 $ 1 $ 1