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Deferred Revenue (Estimated Deferred Revenue) (Details) - USD ($)
$ in Millions
Sep. 30, 2018
Dec. 31, 2017
Fiscal year ended:    
2018 $ 146  
2019 131  
2020 40  
2021 20  
2022 7  
2023 and thereafter 4  
Total 348 $ 287
Initial Listing Revenues    
Fiscal year ended:    
2018 6  
2019 23  
2020 15  
2021 10  
2022 7  
2023 and thereafter 4  
Total 65 64
Annual Listings Revenues    
Fiscal year ended:    
2018 60  
2019 0  
2020 0  
2021 0  
2022 0  
2023 and thereafter 0  
Total 60 3
Market Technology Revenues    
Fiscal year ended:    
2018 18  
2019 34  
2020 18  
2021 7  
2022 0  
2023 and thereafter 0  
Total 77 109
Corporate Solutions Revenues    
Fiscal year ended:    
2018 24  
2019 21  
2020 1  
2021 0  
2022 0  
2023 and thereafter 0  
Total 46  
Information Services Revenues    
Fiscal year ended:    
2018 35  
2019 43  
2020 0  
2021 0  
2022 0  
2023 and thereafter 0  
Total 78 40
Other    
Fiscal year ended:    
2018 3  
2019 10  
2020 6  
2021 3  
2022 0  
2023 and thereafter 0  
Total $ 22 $ 34