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Deferred Revenue (Estimated Deferred Revenue) (Details) - USD ($)
$ in Millions
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Deferred Revenue Arrangement [Line Items]      
2017 $ 164    
2018 61    
2019 48    
2020 39    
2021 13    
2022 and thereafter 8    
Deferred revenue estimated revenue to be recognized 333 $ 327 $ 392
Initial Listing Revenues      
Deferred Revenue Arrangement [Line Items]      
2017 16    
2018 14    
2019 11    
2020 8    
2021 4    
2022 and thereafter 1    
Deferred revenue estimated revenue to be recognized 54 59 54
Listing of Additional Shares Revenues      
Deferred Revenue Arrangement [Line Items]      
2017 21    
2018 11    
2019 4    
2020 1    
2021 0    
2022 and thereafter 0    
Deferred revenue estimated revenue to be recognized 37 53 78
Annual Renewal and Other Revenues      
Deferred Revenue Arrangement [Line Items]      
2017 57    
2018 0    
2019 0    
2020 0    
2021 0    
2022 and thereafter 0    
Deferred revenue estimated revenue to be recognized 57 28 52
Market Technology Revenues      
Deferred Revenue Arrangement [Line Items]      
2017 70    
2018 36    
2019 33    
2020 30    
2021 9    
2022 and thereafter 7    
Deferred revenue estimated revenue to be recognized $ 185 $ 187 $ 208