Goodwill and Other Intangible Assets Other Intangible Assets (Details) - USD ($) $ in Millions	Sep. 30, 2016	Sep. 30, 2015
Intangible Assets [Line Items]
Gross carrying amount, total intangible assets	$ 1,945	$ 1,904
Net, Total Intangible Assets	1,514	1,516
Finite-Lived Intangible Assets, Gross [Abstract]
Gross Carrying Amount	1,401	1,362
Accumulated Amortization	(431)	(388)
Net, Total Amortized Intangible Assets	970	974
Patented Technology
Finite-Lived Intangible Assets, Gross [Abstract]
Gross Carrying Amount	45	80
Accumulated Amortization	(26)	(59)
Net, Total Amortized Intangible Assets	19	21
Customer Relationships
Finite-Lived Intangible Assets, Gross [Abstract]
Gross Carrying Amount	988	975
Accumulated Amortization	(256)	(206)
Net, Total Amortized Intangible Assets	732	769
Miscellaneous
Finite-Lived Intangible Assets, Gross [Abstract]
Gross Carrying Amount	368	307
Accumulated Amortization	(149)	(123)
Net, Total Amortized Intangible Assets	219	184
Trademarks
Indefinite-Lived Intangible Assets (Excluding Goodwill) [Abstract]
Carrying Amount, Gross and Net	$ 544	$ 542