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Acquisitions and Divestiture (2017 Acquisitions) (Details) - USD ($)
$ in Millions
1 Months Ended
Oct. 31, 2017
Sep. 30, 2018
Dec. 31, 2017
Business Acquisition [Line Items]      
Goodwill   $ 6,369 $ 6,586
eVestment      
Business Acquisition [Line Items]      
Purchase Consideration $ 744    
Total Net Liabilities Acquired (10)    
Total Net Deferred Tax Liability (104)    
Acquired Intangible Assets 405    
Goodwill 453    
Cash consideration 705    
Acquisition of businesses, net of cash and cash equivalents acquired 22    
Purchase price allocation deferred tax assets 39    
Purchase price allocation deferred tax liabilities $ 143