Fair Value of Intangible Assets and Related Accumulated Amortization Expense (Detail) (USD $) In Millions	Sep. 30, 2011	Sep. 30, 2010
Intangible Assets by Major Class [Line Items]
Intangible assets, net	$ 11,436	$ 11,478
Customer Relationships
Intangible Assets by Major Class [Line Items]
Finite-Lived intangible assets Gross	337	320
Finite-Lived intangible assets Accumulated Amortization	(44)	(6)
Intangible assets, net	293	314
Trade Names
Intangible Assets by Major Class [Line Items]
Finite-Lived intangible assets Gross	192	190
Finite-Lived intangible assets Accumulated Amortization	(15)	(2)
Intangible assets, net	177	188
Other Intangible Assets
Intangible Assets by Major Class [Line Items]
Finite-Lived intangible assets Gross	97	95
Finite-Lived intangible assets Accumulated Amortization	(14)	(2)
Intangible assets, net	83	93
Total finite-lived intangible assets
Intangible Assets by Major Class [Line Items]
Finite-Lived intangible assets Gross	626	605
Finite-Lived intangible assets Accumulated Amortization	(73)	(10)
Intangible assets, net	553	595
Indefinite-lived Intangible Assets
Intangible Assets by Major Class [Line Items]
Intangible assets, net	$ 10,883	$ 10,883