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Deferred Revenue (Estimated Deferred Revenue) (Details) - USD ($)
$ in Millions
Mar. 31, 2017
Dec. 31, 2016
Mar. 31, 2016
Dec. 31, 2015
Deferred Revenue Arrangement [Line Items]        
2017 $ 301      
2018 67      
2019 50      
2020 40      
2021 18      
2022 and thereafter 10      
Deferred revenue estimated revenue to be recognized 486 $ 333 $ 492 $ 327
Initial Listing Revenues        
Deferred Revenue Arrangement [Line Items]        
2017 12      
2018 14      
2019 12      
2020 8      
2021 5      
2022 and thereafter 2      
Deferred revenue estimated revenue to be recognized 53 54 56 59
Listing of Additional Shares Revenues        
Deferred Revenue Arrangement [Line Items]        
2017 15      
2018 11      
2019 5      
2020 2      
2021 0      
2022 and thereafter 0      
Deferred revenue estimated revenue to be recognized 33 37 48 53
Annual Renewal and Other Revenues        
Deferred Revenue Arrangement [Line Items]        
2017 216      
2018 4      
2019 1      
2020 0      
2021 0      
2022 and thereafter 0      
Deferred revenue estimated revenue to be recognized 221 57 200 28
Market Technology Revenues        
Deferred Revenue Arrangement [Line Items]        
2017 58      
2018 38      
2019 32      
2020 30      
2021 13      
2022 and thereafter 8      
Deferred revenue estimated revenue to be recognized $ 179 $ 185 $ 188 $ 187