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Supplemental Guarantor Condensed Consolidating Financial Statements - Additional Information (Details) - USD ($)
3 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Sep. 30, 2016
Condensed Financial Statements, Captions [Line Items]      
Parent's total ownership, percentage 100.00%    
Parent      
Condensed Financial Statements, Captions [Line Items]      
Pension and retiree benefits, parent obligation $ 697,000,000   $ 708,000,000
Proceeds from investment in subsidiary 0 $ 0  
Subsidiaries      
Condensed Financial Statements, Captions [Line Items]      
Debt and capital lease obligations, subsidiary portion $ 20,000,000   $ 24,000,000