Acquisitions - Additional Information (Detail) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended				12 Months Ended
	Sep. 30, 2011 Year		Sep. 30, 2011 Fundamo	Jun. 09, 2011 Fundamo	Sep. 30, 2010 CyberSource Corporation Acquisition Year	Jul. 21, 2010 CyberSource Corporation Acquisition	Jul. 21, 2010 CyberSource Corporation Acquisition Second Reporting Unit
Business Acquisition [Line Items]
Date of acquisition			June 9, 2011
Total purchase consideration			$ 110	$ 110		$ 1,952
Additional goodwill			80			1,239	800
Replacement awards, issued	977,447	[1]			1,600,000
Stock options, granted fair value						46
Stock options, period of expense recognition	1.3				3
Acquisition-related costs					$ 13

[1] Includes 76,822 options granted in connection with the acquisition of PlaySpan. See Note 5-Acquisitions.