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Goodwill and Acquired Intangible Assets (Finite-Lived and Indefinite-Lived Intangible Assets) (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Mar. 31, 2017
Dec. 31, 2016
Finite-Lived Intangible Assets    
Total Finite-Lived Intangible Assets, Gross Amount $ 1,286 $ 1,279
Accumulated Amortization (460) (436)
Total 826 843
Indefinite-Lived Intangible Assets    
Total Indefinite-Lived Intangible Assets, Net Amount 1,256 1,251
Total Intangible Assets, Gross Amount 2,542 2,530
Total Intangible Assets, Net Amount 2,082 2,094
Exchange and clearing registrations    
Indefinite-Lived Intangible Assets    
Total Indefinite-Lived Intangible Assets, Net Amount 1,257 1,257
Trade names    
Indefinite-Lived Intangible Assets    
Total Indefinite-Lived Intangible Assets, Net Amount 129 130
Licenses    
Indefinite-Lived Intangible Assets    
Total Indefinite-Lived Intangible Assets, Net Amount 52 52
Foreign currency translation adjustment    
Indefinite-Lived Intangible Assets    
Total Indefinite-Lived Intangible Assets, Net Amount (182) (188)
Technology    
Finite-Lived Intangible Assets    
Total Finite-Lived Intangible Assets, Gross Amount 38 38
Accumulated Amortization (25) (24)
Total $ 13 $ 14
Weighted-Average Useful Life (in Years) 5 years 5 years
Customer relationships    
Finite-Lived Intangible Assets    
Total Finite-Lived Intangible Assets, Gross Amount $ 1,394 $ 1,394
Accumulated Amortization (485) (464)
Total $ 909 $ 930
Weighted-Average Useful Life (in Years) 18 years 18 years
Other    
Finite-Lived Intangible Assets    
Total Finite-Lived Intangible Assets, Gross Amount $ 7 $ 7
Accumulated Amortization (6) (6)
Total $ 1 $ 1
Weighted-Average Useful Life (in Years) 6 years 6 years
Foreign currency translation adjustment    
Finite-Lived Intangible Assets    
Total Finite-Lived Intangible Assets, Gross Amount $ (153) $ (160)
Accumulated Amortization 56 58
Total $ (97) $ (102)