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Employee Benefit Plans - Additional Information (Details) - USD ($)
$ in Millions
9 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Defined Benefit Plan Disclosure [Line Items]    
Actuarial gain $ 0 $ 2
Foreign Pension Plans, Defined Benefit [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Actual contributions to benefit plans in period 7  
Estimated future contributions in current fiscal year 1  
United States Pension Plans of US Entity, Defined Benefit [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Actual contributions to benefit plans in period $ 1