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, 2013	Sep. 30, 2012
Deferred Tax Assets
Accrued compensation and benefits	$ 154	$ 103
Comprehensive income	(8)	102
Investments in joint ventures	14	11
Accrued litigation obligation	1	1,654
Volume and support incentives	226	227
Net operating loss carryforward	31	33
Tax credits	22	23
Federal benefit of state taxes	176	90
Federal benefit of foreign taxes	13	16
Other	108	92
Deferred Tax Assets, Valuation Allowance	25	13
Deferred tax assets	712	2,338
Deferred Tax Liabilities
Property, equipment and technology, net	(310)	(288)
Intangible assets	(4,003)	(4,027)
Foreign taxes	(55)	(44)
Other	(12)	(10)
Deferred tax liabilities	(4,380)	(4,369)
Net deferred tax (liabilities) assets	$ (3,668)	$ (2,031)