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Debt - Additional Information (Detail) - USD ($)
$ in Millions
3 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Sep. 30, 2017
Debt Instrument [Line Items]      
Interest expense, net $ 36 $ 40  
Weighted-average interest rate of total debt 4.90% 4.90% 4.90%
Senior Notes      
Debt Instrument [Line Items]      
Scheduled maturities of long-term debt in 2022 $ 883    
Scheduled to mature $ 962    
Revolving Credit Facility      
Debt Instrument [Line Items]      
Extended maturity date of credit facility Jan. 31, 2023    
Term Loan Facility      
Debt Instrument [Line Items]      
Credit facility maturity date Nov. 01, 2023