Summary of the Purchase Price Allocation (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended				12 Months Ended				0 Months Ended	12 Months Ended
	Sep. 30, 2012 Fudamo years	Jun. 09, 2011 Fudamo		Jun. 09, 2011 Fudamo Technology Assets [Member]	Sep. 30, 2012 Pay Span Inc years	Mar. 02, 2011 Pay Span Inc		Sep. 30, 2012 Pay Span Inc Technology Assets [Member]	Jul. 21, 2010 CyberSource Corporation Acquisition years	Sep. 30, 2012 CyberSource Corporation Acquisition years	Jul. 21, 2011 CyberSource Corporation Acquisition		Sep. 30, 2012 CyberSource Corporation Acquisition Technology Assets [Member]
Tangible assets and liabilities
Current assets											$ 259
Non-current assets											150	[1]	122
Current liabilities											(45)
Non-current liabilities											(256)
Tangible assets, net		27	[2]	25		67	[3]	56
Finite-lived intangible assets		5				15					605
Goodwill		80				141					1,239
Net deferred tax liabilities		(2)				(19)
Net assets acquired		$ 110				$ 204					$ 1,952
Finite-lived intangible assets, weighted-average useful live (in years)					2.8
Technology assets, weighted average useful lives (in years)	5				5				12	7

[1] Non-current assets include $122 million of technology assets acquired, which have a weighted-average useful life of 7 years and are recognized in property, equipment and technology, net, on the consolidated balance sheets.

[2] Tangible assets, net, include $25 million of technology assets acquired, which have a useful life of 5 years and are recognized in property, equipment and technology, net, on the consolidated balance sheets.

[3] Tangible assets, net, include $56 million of technology assets acquired, which have a weighted-average useful life of 5 years and are recognized in property, equipment and technology, net, on the consolidated balance sheets.