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Acquisitions and Divestiture (Intangible Assets) (Details) - eVestment
$ in Millions
 1 Months Ended 12 Months Ended
Oct. 31, 2017
USD ($)
Dec. 31, 2017
Finite Lived And Indefinite Lived Intangible Assets [Line Items]    
Intangible Assets $ 405  
Customer relationships    
Finite Lived And Indefinite Lived Intangible Assets [Line Items]    
Intangible Assets $ 378  
Estimated average useful life 14 years  
Amortization period of intangible assets for tax purposes 15 years  
Trade name    
Finite Lived And Indefinite Lived Intangible Assets [Line Items]    
Intangible Assets $ 13  
Estimated average useful life 8 years 8 years
Technology    
Finite Lived And Indefinite Lived Intangible Assets [Line Items]    
Intangible Assets $ 14  
Estimated average useful life 8 years 8 years
Discount rate used | Customer relationships    
Finite Lived And Indefinite Lived Intangible Assets [Line Items]    
Discount rate used 0.093  
Discount rate used | Trade name    
Finite Lived And Indefinite Lived Intangible Assets [Line Items]    
Discount rate used 0.092  
Discount rate used | Technology    
Finite Lived And Indefinite Lived Intangible Assets [Line Items]    
Discount rate used 0.092