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Debt and Other Obligations Debt and Other Obligations - Lease/Leasebacks (Details) $ in Millions	12 Months Ended
	Sep. 30, 2003 USD ($) Units	Sep. 30, 2015 USD ($)	Sep. 30, 2014 USD ($)
Lease/Leasebacks [Abstract]
Proceeds prior to 2004 for CTs	$ 945
Leaseback transaction, number of units \| Units	24
Proceeds in 2003 for QTEs	$ 389
CT and QTE outstanding leaseback obligation		$ 616	$ 691