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Acquisitions and Divestiture (2016 Acquisitions) (Details) - USD ($)
$ in Millions
 1 Months Ended 3 Months Ended 12 Months Ended
May 31, 2016
Feb. 29, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Business Acquisition [Line Items]              
Goodwill         $ 6,363 $ 6,586  
Proceeds from long-term debt issuances, net of debt issuance costs         $ 0 648 $ 2,456
ISE              
Business Acquisition [Line Items]              
Cash consideration       $ 1,070      
Total Net Liabilities Acquired       83      
Total Net Deferred Tax Liability       (185)      
Acquired Intangible Assets, Indefinite-lived             623
Goodwill             549
Purchase price allocation deferred tax liabilities       266      
Purchase price allocation deferred tax assets       81      
Boardvantage              
Business Acquisition [Line Items]              
Cash consideration $ 242            
Total Net Liabilities Acquired 28            
Total Net Deferred Tax Liability (45)         (38)  
Intangible assets, finite-lived             111
Goodwill           $ 141  
Measurement period adjustment, financial liabilities     $ 7        
Purchase price allocation deferred tax liabilities 46            
Purchase price allocation deferred tax assets 1            
Payments to acquire businesses 197            
Cost of acquired entity working capital adjustments 45            
Marketwired              
Business Acquisition [Line Items]              
Cash consideration   $ 111          
Total Net Liabilities Acquired             (1)
Total Net Deferred Tax Liability             (5)
Intangible assets, finite-lived             31
Goodwill             86
Measurement period adjustment related to acquisition       $ 5      
Purchase price allocation deferred tax liabilities   10          
Payments to acquire businesses   109          
Cost of acquired entity working capital adjustments   2          
Nasdaq Canada              
Business Acquisition [Line Items]              
Cash consideration   116          
Total Net Liabilities Acquired   6          
Total Net Deferred Tax Liability   (20)          
Intangible assets, finite-lived             76
Goodwill             $ 54
Payments to acquire businesses   115          
Cost of acquired entity working capital adjustments   1          
Revolving Credit Facility | Boardvantage              
Business Acquisition [Line Items]              
Proceeds from long-term debt issuances, net of debt issuance costs $ 197            
Revolving Credit Facility | Marketwired              
Business Acquisition [Line Items]              
Proceeds from long-term debt issuances, net of debt issuance costs   109          
Revolving Credit Facility | Nasdaq Canada              
Business Acquisition [Line Items]              
Proceeds from long-term debt issuances, net of debt issuance costs   $ 55