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Goodwill and Acquired Intangible Assets (Schedule of Changes in Goodwill) (Details)
$ in Millions
 3 Months Ended
Mar. 31, 2017
USD ($)
Goodwill [Roll Forward]  
Balance at beginning of period $ 6,027
Foreign currency translation adjustment 43
Balance at end of period 6,070
Market Services  
Goodwill [Roll Forward]  
Balance at beginning of period 3,390
Foreign currency translation adjustment 22
Balance at end of period 3,412
Corporate Services  
Goodwill [Roll Forward]  
Balance at beginning of period 674
Foreign currency translation adjustment 3
Balance at end of period 677
Information Services  
Goodwill [Roll Forward]  
Balance at beginning of period 1,806
Foreign currency translation adjustment 13
Balance at end of period 1,819
Market Technology  
Goodwill [Roll Forward]  
Balance at beginning of period 157
Foreign currency translation adjustment 5
Balance at end of period $ 162