Fair Value of the Acquired Intangible Assets (Detail) (CyberSource Corporation Acquisition, USD $) In Millions, unless otherwise specified	12 Months Ended
Sep. 30, 2011 Year	Jul. 21, 2010
Acquired Finite-Lived Intangible Assets [Line Items]
Fair Value		$ 605
Weighted-Average Useful Life	12
Customer Relationships
Acquired Finite-Lived Intangible Assets [Line Items]
Fair Value		320
Weighted-Average Useful Life	10
Reseller Relationships
Acquired Finite-Lived Intangible Assets [Line Items]
Fair Value		95
Weighted-Average Useful Life	9
Trade Names
Acquired Finite-Lived Intangible Assets [Line Items]
Fair Value		$ 190
Weighted-Average Useful Life	15

The amount of acquisition cost of a business combination allocated to an identifiable intangible asset that will be amortized.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 141

-Paragraph 51

-Subparagraph e

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 141

-Paragraph 52

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Name:	us-gaap_BusinessAcquisitionPurchasePriceAllocationAmortizableIntangibleAssets
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant