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Acquisitions and Divestiture (Intangible Assets) (Details)
$ in Millions
 1 Months Ended 12 Months Ended
Oct. 31, 2017
USD ($)
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
USD ($)
Oct. 31, 2018
USD ($)
eVestment          
Finite Lived And Indefinite Lived Intangible Assets [Line Items]          
Intangible assets, finite-lived $ 405       $ 405
eVestment | Customer relationships          
Finite Lived And Indefinite Lived Intangible Assets [Line Items]          
Intangible assets, finite-lived $ 378        
Estimated average useful life 14 years        
Amortization period of intangible assets for tax purposes   15 years      
eVestment | Trade name          
Finite Lived And Indefinite Lived Intangible Assets [Line Items]          
Intangible assets, finite-lived $ 13        
Estimated average useful life 8 years   8 years    
eVestment | Technology          
Finite Lived And Indefinite Lived Intangible Assets [Line Items]          
Intangible assets, finite-lived $ 14        
Estimated average useful life 8 years   8 years    
eVestment | Discount rate used | Customer relationships          
Finite Lived And Indefinite Lived Intangible Assets [Line Items]          
Discount rate used 0.093        
eVestment | Discount rate used | Trade name          
Finite Lived And Indefinite Lived Intangible Assets [Line Items]          
Discount rate used 0.092        
eVestment | Discount rate used | Technology          
Finite Lived And Indefinite Lived Intangible Assets [Line Items]          
Discount rate used 0.092        
ISE          
Finite Lived And Indefinite Lived Intangible Assets [Line Items]          
Identifiable assets acquired       $ 623  
ISE | Customer relationships          
Finite Lived And Indefinite Lived Intangible Assets [Line Items]          
Intangible assets, finite-lived       $ 148  
Estimated average useful life       13 years  
ISE | Discount rate used | Customer relationships          
Finite Lived And Indefinite Lived Intangible Assets [Line Items]          
Discount rate used       0.091  
Boardvantage          
Finite Lived And Indefinite Lived Intangible Assets [Line Items]          
Intangible assets, finite-lived       $ 111  
Boardvantage | Customer relationships          
Finite Lived And Indefinite Lived Intangible Assets [Line Items]          
Intangible assets, finite-lived       $ 103  
Estimated average useful life       14 years  
Boardvantage | Trade name          
Finite Lived And Indefinite Lived Intangible Assets [Line Items]          
Intangible assets, finite-lived       $ 2  
Estimated average useful life       1 year  
Boardvantage | Technology          
Finite Lived And Indefinite Lived Intangible Assets [Line Items]          
Intangible assets, finite-lived       $ 6  
Estimated average useful life       5 years  
Boardvantage | Discount rate used | Customer relationships          
Finite Lived And Indefinite Lived Intangible Assets [Line Items]          
Discount rate used       0.155  
Boardvantage | Discount rate used | Trade name          
Finite Lived And Indefinite Lived Intangible Assets [Line Items]          
Discount rate used       0.150  
Boardvantage | Discount rate used | Technology          
Finite Lived And Indefinite Lived Intangible Assets [Line Items]          
Discount rate used       0.155  
Marketwired          
Finite Lived And Indefinite Lived Intangible Assets [Line Items]          
Intangible assets, finite-lived       $ 31  
Marketwired | Customer relationships          
Finite Lived And Indefinite Lived Intangible Assets [Line Items]          
Intangible assets, finite-lived       $ 29  
Estimated average useful life       6 years  
Marketwired | Trade name          
Finite Lived And Indefinite Lived Intangible Assets [Line Items]          
Intangible assets, finite-lived       $ 2  
Estimated average useful life       2 years  
Marketwired | Discount rate used | Customer relationships          
Finite Lived And Indefinite Lived Intangible Assets [Line Items]          
Discount rate used       0.164  
Marketwired | Discount rate used | Trade name          
Finite Lived And Indefinite Lived Intangible Assets [Line Items]          
Discount rate used       0.158  
Nasdaq Canada          
Finite Lived And Indefinite Lived Intangible Assets [Line Items]          
Intangible assets, finite-lived       $ 76  
Nasdaq Canada | Customer relationships          
Finite Lived And Indefinite Lived Intangible Assets [Line Items]          
Intangible assets, finite-lived       $ 76  
Estimated average useful life       17 years  
Nasdaq Canada | Discount rate used | Customer relationships          
Finite Lived And Indefinite Lived Intangible Assets [Line Items]          
Discount rate used       0.103  
Licenses | ISE          
Finite Lived And Indefinite Lived Intangible Assets [Line Items]          
Intangible assets, indefinite-lived       $ 467  
Licenses | ISE | Discount rate used          
Finite Lived And Indefinite Lived Intangible Assets [Line Items]          
Discount rate used       0.086  
Trade name | ISE          
Finite Lived And Indefinite Lived Intangible Assets [Line Items]          
Intangible assets, indefinite-lived       $ 8  
Trade name | ISE | Discount rate used          
Finite Lived And Indefinite Lived Intangible Assets [Line Items]          
Discount rate used       0.086