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Acquisitions (Acquisition of Businesses) (Details) - USD ($)
$ in Millions
Mar. 31, 2017
Dec. 31, 2016
Jun. 30, 2016
May 31, 2016
Feb. 29, 2016
Business Acquisition [Line Items]          
Goodwill $ 6,070 $ 6,027      
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