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Goodwill and Acquired Intangible Assets (Finite-Lived and Indefinite-Lived Intangible Assets) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Finite-Lived Intangible Assets    
Total Finite-Lived Intangible Assets, Gross Amount $ 1,279 $ 944
Accumulated Amortization (436) (371)
Total 843 573
Indefinite-Lived Intangible Assets    
Total Indefinite-Lived Intangible Assets, Net Amount 1,251 1,386
Total Intangible Assets, Gross Amount 2,530 2,330
Total Intangible Assets, Net Amount 2,094 1,959
Exchange and clearing registrations    
Indefinite-Lived Intangible Assets    
Total Indefinite-Lived Intangible Assets, Net Amount 1,257 790
Trade names    
Indefinite-Lived Intangible Assets    
Total Indefinite-Lived Intangible Assets, Net Amount 130 700
Licenses    
Indefinite-Lived Intangible Assets    
Total Indefinite-Lived Intangible Assets, Net Amount 52 51
Foreign currency translation adjustment    
Indefinite-Lived Intangible Assets    
Total Indefinite-Lived Intangible Assets, Net Amount (188) (155)
Technology    
Finite-Lived Intangible Assets    
Total Finite-Lived Intangible Assets, Gross Amount 38 39
Accumulated Amortization (24) (23)
Total $ 14 $ 16
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 $ 1,038
Accumulated Amortization (464) (387)
Total $ 930 $ 651
Weighted-Average Useful Life (in Years) 18 years 20 years
Other    
Finite-Lived Intangible Assets    
Total Finite-Lived Intangible Assets, Gross Amount $ 7 $ 5
Accumulated Amortization (6) (4)
Total $ 1 $ 1
Weighted-Average Useful Life (in Years) 6 years 9 years
Foreign currency translation adjustment    
Finite-Lived Intangible Assets    
Total Finite-Lived Intangible Assets, Gross Amount $ (160) $ (138)
Accumulated Amortization 58 43
Total $ (102) $ (95)