Tax Effect of Temporary Differences that Give Rise to Significant Portions of Deferred Tax Assets and Liabilities (Detail) (USD $) In Millions, unless otherwise specified	Sep. 30, 2012	Sep. 30, 2011
Deferred Tax Assets
Accrued compensation and benefits	$ 103	$ 96
Comprehensive income	102	104
Investments in joint ventures	11	15
Accrued litigation obligation	1,654	128
Volume and support incentives	227	184
Net operating loss carryforward	33	38
Tax credits	23	26
Federal benefit of state taxes	90	300
Federal benefit of foreign taxes	16	7
Other	92	76
Deferred Tax Assets, Valuation Allowance	13	0
Deferred tax assets	2,338	974
Deferred Tax Liabilities
Property, equipment and technology, net	(288)	(266)
Intangible assets	(4,027)	(4,374)
Foreign taxes	(44)	(40)
Other	(10)	(10)
Deferred tax liabilities	(4,369)	(4,690)
Net deferred tax (liabilities) assets	$ (2,031)	$ (3,716)