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Goodwill and Acquired Intangible Assets (Schedule of Changes in Goodwill) (Details) - USD ($)
$ in Millions
 1 Months Ended 12 Months Ended
Oct. 31, 2018
Dec. 31, 2018
Goodwill [Roll Forward]    
Balance at beginning of period   $ 6,586
Goodwill acquired   56
Measurement period adjustment   (8)
Reclassification of goodwill   0
Goodwill reclassified to held for sale   (47)
Foreign currency translation adjustment   (224)
Balance at end of period   6,363
Market Services    
Goodwill [Roll Forward]    
Balance at beginning of period   3,546
Goodwill acquired   0
Measurement period adjustment   0
Reclassification of goodwill   0
Goodwill reclassified to held for sale   0
Foreign currency translation adjustment   (116)
Balance at end of period   3,430
Corporate Services    
Goodwill [Roll Forward]    
Balance at beginning of period   490
Goodwill acquired   0
Measurement period adjustment   0
Reclassification of goodwill   29
Goodwill reclassified to held for sale   (47)
Foreign currency translation adjustment   (17)
Balance at end of period   455
Information Services    
Goodwill [Roll Forward]    
Balance at beginning of period   2,362
Goodwill acquired   56
Measurement period adjustment $ 8 (8)
Reclassification of goodwill   0
Goodwill reclassified to held for sale   0
Foreign currency translation adjustment   (77)
Balance at end of period   2,333
Market Technology    
Goodwill [Roll Forward]    
Balance at beginning of period   188
Goodwill acquired   0
Measurement period adjustment   0
Reclassification of goodwill   (29)
Goodwill reclassified to held for sale   0
Foreign currency translation adjustment   (14)
Balance at end of period   $ 145