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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 9 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Pension Plan [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 1 $ 1 $ 3 $ 4
Interest cost 2 2 5 8
Expected return on plan assets (3) (2) (7) (8)
Curtailment 0 0 0 (18)
Total net periodic benefit costs (income) 0 1 1 (14)
Other Postretirement Benefit Plan, Defined Benefit [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 0 1 1 1
Interest cost 1 0 1 1
Expected return on plan assets 0 0 0 0
Curtailment 0 0 0 0
Total net periodic benefit costs (income) $ 1 $ 1 $ 2 $ 2