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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, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Pension Plan [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 1 $ 2 $ 4 $ 6
Interest cost 2 3 8 7
Expected return on plan assets (2) (3) (8) (9)
Curtailment 0 0 (18) 0
Actuarial (gain) loss 0 0 0 0
Total net periodic benefit costs (income) 1 2 (14) 4
Other Postretirement Benefit Plan, Defined Benefit [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 1 1 1 1
Interest cost 0 0 1 1
Expected return on plan assets 0 0 0 0
Curtailment 0 0 0 0
Actuarial (gain) loss 0 0 0 0
Total net periodic benefit costs (income) $ 1 $ 1 $ 2 $ 2