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Acquisitions (2016 Acquisitions) (Narrative) (Details) - USD ($)
$ in Millions
 1 Months Ended 3 Months Ended
May 31, 2016
Feb. 29, 2016
Jun. 30, 2016
ISE      
Business Acquisition [Line Items]      
Purchase price     $ 1,070
Net assets (liabilities)     83
Net deferred tax liability     185
Purchase price allocation deferred tax liabilities     266
Purchase price allocation deferred tax assets     81
Boardvantage      
Business Acquisition [Line Items]      
Purchase price $ 242    
Net assets (liabilities) 28    
Net deferred tax liability 45    
Purchase price allocation deferred tax liabilities 46    
Purchase price allocation deferred tax assets 1    
Cash paid 197    
Working capital adjustments 45    
Credit facility, proceeds $ 197    
Marketwired      
Business Acquisition [Line Items]      
Purchase price   $ 111  
Net assets (liabilities)   (1)  
Net deferred tax liability   5  
Purchase price allocation deferred tax liabilities   10  
Cash paid   109  
Working capital adjustments   2  
Measurement period adjustment     $ 5
Nasdaq CXC      
Business Acquisition [Line Items]      
Purchase price   116  
Net assets (liabilities)   6  
Net deferred tax liability   20  
Cash paid   115  
Working capital adjustments   1  
Revolving Credit Facility | Marketwired      
Business Acquisition [Line Items]      
Credit facility, proceeds   109  
Revolving Credit Facility | Nasdaq CXC      
Business Acquisition [Line Items]      
Credit facility, proceeds   $ 55