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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, 2026
Mar. 31, 2025
Mar. 31, 2026
Mar. 31, 2025
Defined Benefit Plan Disclosure [Line Items]        
Curtailment loss       $ 1
Pension Plan [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 1 $ 1 $ 2 2
Interest cost 3 3 6 6
Expected return on plan assets (2) (3) (5) (5)
Curtailment loss     0 1
Total net periodic benefit costs 2 1 3 4
Other Postretirement Benefits Plan [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 0 0 0 0
Interest cost 0 1 1 1
Expected return on plan assets 0 0 0 0
Curtailment loss     0 0
Total net periodic benefit costs $ 0 $ 1 $ 1 $ 1