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Acquisitions (Acquisition of Businesses) (Details) - USD ($)
$ in Millions
Dec. 31, 2016
Jun. 30, 2016
May 31, 2016
Feb. 29, 2016
Dec. 31, 2015
Business Acquisition [Line Items]          
Goodwill $ 6,027       $ 5,395
ISE          
Business Acquisition [Line Items]          
Purchase Consideration   $ 1,070      
Total Net Assets (Liabilities) Acquired   83      
Total Net Deferred Tax Liability   (185)      
Acquired Intangible Assets 623 623      
Goodwill   $ 549      
Boardvantage          
Business Acquisition [Line Items]          
Purchase Consideration     $ 242    
Total Net Assets (Liabilities) Acquired     28    
Total Net Deferred Tax Liability     (45)    
Acquired Intangible Assets 111   111    
Goodwill     $ 148    
Marketwired          
Business Acquisition [Line Items]          
Purchase Consideration       $ 111  
Total Net Assets (Liabilities) Acquired       (1)  
Total Net Deferred Tax Liability       (5)  
Acquired Intangible Assets 31     31  
Goodwill       86  
Nasdaq CXC          
Business Acquisition [Line Items]          
Purchase Consideration       116  
Total Net Assets (Liabilities) Acquired       6  
Total Net Deferred Tax Liability       (20)  
Acquired Intangible Assets $ 76     76  
Goodwill       $ 54