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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
Dec. 31, 2018
Dec. 31, 2017
Pension Plan [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Service cost $ 2 $ 2
Interest cost 3 3
Expected return on plan assets (3) (3)
Curtailment (18) 0
Actuarial (gain) loss 0 0
Total net periodic benefit costs (16) 2
Other Postretirement Benefit Plan, Defined Benefit [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Service cost 0 1
Interest cost 0 0
Expected return on plan assets 0 0
Curtailment 0 0
Actuarial (gain) loss 0 0
Total net periodic benefit costs $ 0 $ 1