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Acquisitions (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 12 Months Ended
Mar. 31, 2011
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2011
CashEdge Inc. [Member]
Sep. 30, 2011
CashEdge Inc. [Member]
Mar. 31, 2011
Mobile Commerce Ltd. [Member]
Sep. 30, 2011
Customer Related Intangible Assets [Member]
CashEdge Inc. [Member]
Sep. 30, 2011
Software And Technology [Member]
CashEdge Inc. [Member]
Business Acquisition [Line Items]                
Number of acquisitions   4 1          
Revenue from acquired companies   $ 30            
Number of other business acquisitions 2              
Date of acquisition       September 2011        
Purchase price, net of cash acquired         460 50    
Preliminary purchase price allocation, intangibles           40 54 44
Preliminary purchase price allocation, goodwill         330      
Preliminary purchase price allocation, net deferred tax assets         26      
Preliminary purchase price allocation, identifiable net assets         $ 10