Goodwill and Other Intangible Assets - Other Intangible Assets (Details) - USD ($) $ in Millions	Jun. 30, 2016	Sep. 30, 2015	Jun. 30, 2015
Intangible Assets [Line Items]
Gross carrying amount, total intangible assets	$ 2,003	$ 1,904	$ 1,916
Net, Total Intangible Assets	1,568	1,516	1,545
Finite-Lived Intangible Assets, Gross [Abstract]
Gross Carrying Amount	1,460	1,362	1,373
Accumulated Amortization	(435)	(388)	(371)
Net, Total Amortized Intangible Assets	1,025	974	1,002
Patented Technology
Finite-Lived Intangible Assets, Gross [Abstract]
Gross Carrying Amount	47	80	83
Accumulated Amortization	(28)	(59)	(60)
Net, Total Amortized Intangible Assets	19	21	23
Customer Relationships
Finite-Lived Intangible Assets, Gross [Abstract]
Gross Carrying Amount	1,015	975	986
Accumulated Amortization	(251)	(206)	(195)
Net, Total Amortized Intangible Assets	764	769	791
Miscellaneous
Finite-Lived Intangible Assets, Gross [Abstract]
Gross Carrying Amount	398	307	304
Accumulated Amortization	(156)	(123)	(116)
Net, Total Amortized Intangible Assets	242	184	188
Trademarks
Indefinite-Lived Intangible Assets (Excluding Goodwill) [Abstract]
Carrying Amount, Gross and Net	$ 543	$ 542	$ 543