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Stock Award Plans (Narrative) (Details) (USD $)
12 Months Ended
Dec. 31, 2011
years
May 31, 2010
May 31, 2009
Dec. 31, 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Common stock shares reserved for issuance under future share-based awards 13,000,000      
Stock-based compensation expense included in provision for income taxes $ 24,000,000      
Unrecognized compensation cost 60,000,000      
Unrecognized compensation expense expected to recognized over weighted-average period, in years 2.5      
Period target attainment expected to be recognized August 31, 2015      
Shares settled for tax withholding 660,000      
Aggregate intrinsic value of stock options outstanding 35,000,000      
Aggregate intrinsic value of stock options exercisable 32,000,000      
Aggregate intrinsic value of stock options exercisable, Weighted-Average $ 18.94      
Weighted average remaining contractual life of options outstanding, in years 3.4      
Weighted average remaining contractual life of options exercisable, in years 3.2      
Payroll deductions 20.00%      
Offering price percentage 5.00%      
Weighted-average grant date fair value, granted $ 4.14 $ 2.76 $ 0.95  
Total intrinsic value of options exercised 1,000,000 9,000,000 6,000,000 20,000,000
Service-Based Share Awards [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Unrecognized compensation cost 43,000,000      
Performance-Based Share Awards [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Unrecognized compensation cost 14,000,000      
Target attainment rate of unrecognized compensation cost 100.00%      
Awards Granted Under Revenue And Adjusted Operating Income Category [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Target attainment rate of unrecognized compensation cost 71.00%      
Misys Stock Plan [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Expense recognized for acceleration of options vested 1,000,000      
Expense recognized for acceleration of options vested, reversal for cancellations 1,000,000      
Stock-based compensation expense   2,000,000 1,000,000  
Monte Carlo Option Pricing Model [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Volatility   42.00% 33.00%  
Correlation coefficient     0.30  
Maximum [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Annual fair value limit on shares purchased $ 25,000      
Annual Maximum [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Common stock issued under stock plans, shares 500,000      
Shares purchased under the ESPP 500,000      
Plan Maximum [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Common stock issued under stock plans, shares 140,000      
Shares purchased under the ESPP 140,000