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Deferred Revenue (Changes in Deferred Revenue) (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Movement in Deferred Revenue [Roll Forward]    
Beginning Balance $ 333 $ 327
Additions 361 384
Amortization (211) (218)
Translation adjustment 3 (1)
Ending Balance 486 492
Initial Listing Revenues    
Movement in Deferred Revenue [Roll Forward]    
Beginning Balance 54 59
Additions 4 1
Amortization (5) (4)
Translation adjustment 0 0
Ending Balance 53 56
Listing of Additional Shares Revenues    
Movement in Deferred Revenue [Roll Forward]    
Beginning Balance 37 53
Additions 5 2
Amortization (9) (7)
Translation adjustment 0 0
Ending Balance 33 48
Annual Renewal and Other Revenues    
Movement in Deferred Revenue [Roll Forward]    
Beginning Balance 57 28
Additions 306 314
Amortization (142) (143)
Translation adjustment 0 1
Ending Balance 221 200
Market Technology Revenues    
Movement in Deferred Revenue [Roll Forward]    
Beginning Balance 185 187
Additions 46 67
Amortization (55) (64)
Translation adjustment 3 (2)
Ending Balance $ 179 $ 188