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Acquisitions (Intangible Assets) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Jun. 30, 2016
May 31, 2016
Feb. 29, 2016
Jan. 30, 2015
ISE            
Finite Lived And Indefinite Lived Intangible Assets [Line Items]            
Acquired intangible assets $ 623   $ 623      
Boardvantage            
Finite Lived And Indefinite Lived Intangible Assets [Line Items]            
Acquired intangible assets 111     $ 111    
Marketwired            
Finite Lived And Indefinite Lived Intangible Assets [Line Items]            
Acquired intangible assets 31       $ 31  
Nasdaq CXC            
Finite Lived And Indefinite Lived Intangible Assets [Line Items]            
Acquired intangible assets $ 76       $ 76  
DWA            
Finite Lived And Indefinite Lived Intangible Assets [Line Items]            
Acquired intangible assets   $ 141       $ 141
Customer relationships            
Finite Lived And Indefinite Lived Intangible Assets [Line Items]            
Amortization period of intangible assets for tax purposes 15 years          
Customer relationships | ISE            
Finite Lived And Indefinite Lived Intangible Assets [Line Items]            
Acquired intangible assets $ 148          
Discount rate used 9.10%          
Estimated average remaining useful life 13 years          
Customer relationships | Boardvantage            
Finite Lived And Indefinite Lived Intangible Assets [Line Items]            
Acquired intangible assets $ 103          
Discount rate used 15.50%          
Estimated average remaining useful life 14 years          
Customer relationships | Marketwired            
Finite Lived And Indefinite Lived Intangible Assets [Line Items]            
Acquired intangible assets $ 29          
Discount rate used 16.40%          
Estimated average remaining useful life 6 years          
Customer relationships | Nasdaq CXC            
Finite Lived And Indefinite Lived Intangible Assets [Line Items]            
Acquired intangible assets $ 76          
Discount rate used 10.30%          
Estimated average remaining useful life 17 years          
Customer relationships | DWA            
Finite Lived And Indefinite Lived Intangible Assets [Line Items]            
Acquired intangible assets   $ 29        
Discount rate used   17.50%        
Estimated average remaining useful life   15 years        
Technology | Boardvantage            
Finite Lived And Indefinite Lived Intangible Assets [Line Items]            
Acquired intangible assets $ 6          
Discount rate used 15.50%          
Estimated average remaining useful life 5 years          
Technology | DWA            
Finite Lived And Indefinite Lived Intangible Assets [Line Items]            
Acquired intangible assets   $ 4        
Discount rate used   17.00%        
Estimated average remaining useful life   5 years        
Exchange registrations | ISE            
Finite Lived And Indefinite Lived Intangible Assets [Line Items]            
Acquired intangible assets $ 467          
Discount rate used 8.60%          
Trade name | ISE            
Finite Lived And Indefinite Lived Intangible Assets [Line Items]            
Acquired intangible assets $ 8          
Discount rate used 8.60%          
Trade name | Boardvantage            
Finite Lived And Indefinite Lived Intangible Assets [Line Items]            
Acquired intangible assets $ 2          
Discount rate used 15.00%          
Estimated average remaining useful life 1 year          
Trade name | Marketwired            
Finite Lived And Indefinite Lived Intangible Assets [Line Items]            
Acquired intangible assets $ 2          
Discount rate used 15.80%          
Estimated average remaining useful life 2 years          
Trade name | DWA            
Finite Lived And Indefinite Lived Intangible Assets [Line Items]            
Acquired intangible assets   $ 108        
Discount rate used   17.00%        
Income Approach Valuation Technique | Trade name | DWA            
Finite Lived And Indefinite Lived Intangible Assets [Line Items]            
Amortization period of intangible assets for tax purposes 15 years          
Income Approach Valuation Technique | Minimum | Customer relationships | DWA            
Finite Lived And Indefinite Lived Intangible Assets [Line Items]            
Customer relationships intangible assets, period of growth 3 years          
Income Approach Valuation Technique | Maximum | Customer relationships | DWA            
Finite Lived And Indefinite Lived Intangible Assets [Line Items]            
Customer relationships intangible assets, period of growth 6 years