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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

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