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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, 2019
Dec. 31, 2018
Pension Plan [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Service cost $ 1 $ 2
Interest cost 2 3
Expected return on plan assets (3) (3)
Curtailment 0 (18)
Actuarial (gain) loss 0 0
Total net periodic benefit costs 0 (16)
Other Postretirement Benefit Plan, Defined Benefit [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Service cost 0 0
Interest cost 1 0
Expected return on plan assets 0 0
Curtailment 0 0
Actuarial (gain) loss 0 0
Total net periodic benefit costs $ 1 $ 0