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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, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Defined Benefit Plan Disclosure [Line Items]        
Actuarial (gain) loss     $ 0 $ (2)
Pension Plan [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Service cost [1] $ 2 $ 2 6 6
Interest cost [2] 3 2 7 6
Expected return on plan assets [2] (3) (2) (9) (8)
Actuarial (gain) loss [2]     0 0
Total net periodic benefit costs (income) 2 2 4 4
Other Postretirement Benefit Plan, Defined Benefit [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Service cost [1] 1 0 1 0
Interest cost [2] 0 0 1 1
Expected return on plan assets [2] 0 0 0 0
Actuarial (gain) loss [2]     0 (2)
Total net periodic benefit costs (income) $ 1 $ 0 $ 2 $ (1)
[1] Service cost was not impacted by new accounting guidance adopted in 2018 and is therefore still classified within the selling, general and administrative expense and cost of sales captions on the Statements of Consolidated Comprehensive Income (Loss). See Note A for additional information.
[2] These components are now classified within the other net periodic benefit income caption on the Statements of Consolidated Comprehensive Income (Loss) due to the adoption of new accounting guidance in the current quarter. See Note A for additional information.