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Deferred Revenue (Changes in Deferred Revenue) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Movement in Deferred Revenue [Roll Forward]    
Beginning Balance $ 327 $ 392
Additions 864 626
Amortization (849) (674)
Translation adjustment (9) (17)
Ending Balance 333 327
Initial Listing Revenues    
Movement in Deferred Revenue [Roll Forward]    
Beginning Balance 59 54
Additions 13 21
Amortization (18) (16)
Translation adjustment 0 0
Ending Balance 54 59
Listing of Additional Shares Revenues    
Movement in Deferred Revenue [Roll Forward]    
Beginning Balance 53 78
Additions 12 10
Amortization (28) (35)
Translation adjustment 0 0
Ending Balance 37 53
Annual Renewal and Other Revenues    
Movement in Deferred Revenue [Roll Forward]    
Beginning Balance 28 52
Additions 606 403
Amortization (576) (424)
Translation adjustment (1) (3)
Ending Balance 57 28
Market Technology Revenues    
Movement in Deferred Revenue [Roll Forward]    
Beginning Balance 187 208
Additions 233 192
Amortization (227) (199)
Translation adjustment (8) (14)
Ending Balance $ 185 $ 187