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Goodwill and Acquired Intangible Assets (Finite-Lived and Indefinite-Lived Intangible Assets) (Details) - USD ($)
$ in Millions
 9 Months Ended 12 Months Ended
Sep. 30, 2018
Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items]    
Gross Amount $ 1,632 $ 1,679
Accumulated Amortization (562) (506)
Net Amount 1,070 1,173
Indefinite-lived Intangible Assets [Line Items]    
Indefinite-Lived Intangible Assets 1,258 1,295
Total intangible assets 2,890 2,974
Intangible assets, net 2,328 2,468
Exchange and clearing registrations    
Indefinite-lived Intangible Assets [Line Items]    
Indefinite-Lived Intangible Assets 1,257 1,257
Trade name    
Indefinite-lived Intangible Assets [Line Items]    
Indefinite-Lived Intangible Assets 127 129
Licenses    
Indefinite-lived Intangible Assets [Line Items]    
Indefinite-Lived Intangible Assets 52 52
Foreign currency translation adjustment    
Indefinite-lived Intangible Assets [Line Items]    
Indefinite-Lived Intangible Assets (178) (143)
Technology    
Finite-Lived Intangible Assets [Line Items]    
Gross Amount 50 65
Accumulated Amortization (13) (22)
Net Amount $ 37 $ 43
Weighted-Average Useful Life (in Years) 9 years 8 years
Customer relationships    
Finite-Lived Intangible Assets [Line Items]    
Gross Amount $ 1,708 $ 1,708
Accumulated Amortization (606) (526)
Net Amount $ 1,102 $ 1,182
Weighted-Average Useful Life (in Years) 18 years 18 years
Other    
Finite-Lived Intangible Assets [Line Items]    
Gross Amount $ 17 $ 17
Accumulated Amortization (5) (4)
Net Amount $ 12 $ 13
Weighted-Average Useful Life (in Years) 8 years 8 years
Foreign currency translation adjustment    
Finite-Lived Intangible Assets [Line Items]    
Gross Amount $ (143) $ (111)
Accumulated Amortization 62 46
Net Amount $ (81) $ (65)