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Supplemental Guarantor Condensed Consolidating Financial Statements (Details Textual) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Jun. 30, 2014
Jun. 30, 2015
Sep. 30, 2014
Condensed Financial Statements, Captions [Line Items]      
Company's overall ownership, as a percentage   100.00%  
Threshold for reporting consolidating financial statements   25.00%  
Amount of restricted net assets for consolidated and unconsolidated subsidiaries   $ 29  
Parent      
Condensed Financial Statements, Captions [Line Items]      
Pension and retiree medical benefit obligations   652 $ 684
Cash dividends paid to the Parent $ 5 37  
Subsidiaries [Member]      
Condensed Financial Statements, Captions [Line Items]      
Debt and capital lease obligations   $ 42 $ 55