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Acquisitions and Divestiture (2017 Acquisitions) (Details) - USD ($)
$ in Millions
 1 Months Ended 12 Months Ended
Oct. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Oct. 31, 2018
Business Acquisition [Line Items]          
Purchase Consideration   $ 101 $ 778 $ 1,466  
Goodwill   $ 6,363 $ 6,586    
eVestment          
Business Acquisition [Line Items]          
Purchase Consideration $ 744        
Total Net Liabilities Acquired 10       $ (10)
Total Net Deferred Tax Liability (104)       (96)
Acquired Intangible Assets 405       405
Goodwill         $ 445
Purchase price 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