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Supplemental Guarantor Condensed Consolidating Financial Statements - Additional Information (Details) - USD ($)
$ in Millions
9 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Sep. 30, 2018
Condensed Financial Information Disclosure [Abstract]      
Parent's total ownership, percentage 100.00%    
Parent      
Condensed Financial Statements, Captions [Line Items]      
Pension and retiree benefits, parent obligation $ 224   $ 248
Proceeds from investment in subsidiary 29 $ 29  
Subsidiaries      
Condensed Financial Statements, Captions [Line Items]      
Debt and capital lease obligations, subsidiary portion $ 5   $ 51