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Deferred Revenue (Changes in Deferred Revenue) (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2018
USD ($)
Change in Contract with Customer Liability [Roll Forward]  
Beginning balance $ 287
Additions 867
Revenue recognized (850)
Reclassification of deferred revenue 0
Deferred revenue reclassified to held for sale(2) (12)
Translation adjustment (11)
Ending balance 281
Initial Listing Revenues  
Change in Contract with Customer Liability [Roll Forward]  
Beginning balance 64
Additions 29
Revenue recognized (25)
Reclassification of deferred revenue 0
Deferred revenue reclassified to held for sale(2) 0
Translation adjustment (2)
Ending balance 66
Annual Listings Revenues  
Change in Contract with Customer Liability [Roll Forward]  
Beginning balance 3
Additions 236
Revenue recognized (234)
Reclassification of deferred revenue 0
Deferred revenue reclassified to held for sale(2) 0
Translation adjustment (1)
Ending balance 4
Market Technology Revenues  
Change in Contract with Customer Liability [Roll Forward]  
Beginning balance 109
Additions 168
Revenue recognized (183)
Reclassification of deferred revenue (11)
Deferred revenue reclassified to held for sale(2) 0
Translation adjustment (8)
Ending balance 75
Corporate Solutions and Other Revenues  
Change in Contract with Customer Liability [Roll Forward]  
Beginning balance 37
Additions 242
Revenue recognized (242)
Reclassification of deferred revenue 11
Deferred revenue reclassified to held for sale(2) (12)
Translation adjustment 0
Ending balance 36
Information Services Revenues  
Change in Contract with Customer Liability [Roll Forward]  
Beginning balance 40
Additions 169
Revenue recognized (130)
Reclassification of deferred revenue 0
Deferred revenue reclassified to held for sale(2) 0
Translation adjustment 1
Ending balance 80
Other  
Change in Contract with Customer Liability [Roll Forward]  
Beginning balance 34
Additions 23
Revenue recognized (36)
Reclassification of deferred revenue 0
Deferred revenue reclassified to held for sale(2) 0
Translation adjustment (1)
Ending balance $ 20