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Debt and Other Obligations Lease/Leaseback Obligations (Details) $ in Millions	12 Months Ended
	Sep. 30, 2003 USD ($) Units	Mar. 31, 2016 USD ($)	Sep. 30, 2015 USD ($)
Debt Disclosure [Abstract]
Proceeds prior to 2004	$ 945
Leaseback transaction, number of units \| Units	24
Proceeds in 2003	$ 389
CT and QTE outstanding leaseback obligation		$ 559	$ 616