Goodwill and Other Intangible Assets - Other Intangible Assets (Detail) (USD $) In Millions, unless otherwise specified	Mar. 31, 2013	Sep. 30, 2012	Mar. 31, 2012
Intangible Assets [Line Items]
Gross Carrying Amount, Total Amortized Intangible Assets	$ 1,118	$ 909	$ 898
Gross Carrying Amount, Total Intangible Assets	1,433	1,224	1,213
Accumulated Amortization	(307)	(277)	(247)
Net, Total Amortized Intangible Assets	811	632	651
Net, Total Intangible Assets	1,126	947	966
Trademarks
Intangible Assets [Line Items]
Gross Carrying Amount and Net	315	315	315
Patented Technology
Intangible Assets [Line Items]
Gross Carrying Amount, Total Amortized Intangible Assets	165	188	193
Accumulated Amortization	(99)	(113)	(107)
Net, Total Amortized Intangible Assets	66	75	86
Customer Relationships
Intangible Assets [Line Items]
Gross Carrying Amount, Total Amortized Intangible Assets	620	517	511
Accumulated Amortization	(124)	(117)	(101)
Net, Total Amortized Intangible Assets	496	400	410
Miscellaneous
Intangible Assets [Line Items]
Gross Carrying Amount, Total Amortized Intangible Assets	333	204	194
Accumulated Amortization	(84)	(47)	(39)
Net, Total Amortized Intangible Assets	$ 249	$ 157	$ 155