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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, 2022
Mar. 31, 2021
Mar. 31, 2022
Mar. 31, 2021
Defined Benefit Plan Disclosure [Line Items]        
Actuarial (gain) $ (1) $ 0 $ (1) $ 0
Pension Plan        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 1 1 2 3
Interest cost 1 2 3 3
Expected return on plan assets (2) (2) (4) (4)
Actuarial (gain) (1) 0 (1) 0
Total net periodic benefit costs (1) 1 0 2
Other Postretirement Benefits Plan [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 0 0 0 0
Interest cost 1 0 1 1
Expected return on plan assets 0 0 0 0
Actuarial (gain) 0 0 0 0
Total net periodic benefit costs $ 1 $ 0 $ 1 $ 1