Goodwill and Other Intangible Assets - Other Intangible Assets (Details) - USD ($) $ in Millions	Jun. 30, 2015	Sep. 30, 2014	Jun. 30, 2014
Intangible Assets [Line Items]
Gross carrying amount, total intangible assets	$ 1,916	$ 1,962	$ 2,004
Net, Total Intangible Assets	1,545	1,639	1,669
Finite-Lived Intangible Assets, Gross [Abstract]
Gross Carrying Amount	1,373	1,415	1,472
Accumulated Amortization	(371)	(323)	(335)
Net, Total Amortized Intangible Assets	1,002	1,092	1,137
Patented Technology
Finite-Lived Intangible Assets, Gross [Abstract]
Gross Carrying Amount	83	86	88
Accumulated Amortization	(60)	(56)	(56)
Net, Total Amortized Intangible Assets	23	30	32
Customer Relationships
Finite-Lived Intangible Assets, Gross [Abstract]
Gross Carrying Amount	986	1,017	1,014
Accumulated Amortization	(195)	(161)	(163)
Net, Total Amortized Intangible Assets	791	856	851
Miscellaneous
Finite-Lived Intangible Assets, Gross [Abstract]
Gross Carrying Amount	304	312	370
Accumulated Amortization	(116)	(106)	(116)
Net, Total Amortized Intangible Assets	188	206	254
Trademarks
Indefinite-Lived Intangible Assets (Excluding Goodwill) [Abstract]
Carrying Amount, Gross and Net	$ 543	$ 547	$ 532