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Supplemental Guarantor Condensed Consolidating Financial Statements - Additional Information (Details) - USD ($)
3 Months Ended
Dec. 31, 2018
Dec. 31, 2017
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 $ 241,000,000   $ 248,000,000
Proceeds from investment in subsidiary 0 $ 6,000,000  
Subsidiaries      
Condensed Financial Statements, Captions [Line Items]      
Debt and capital lease obligations, subsidiary portion $ 84,000,000   $ 51,000,000