Deferred Revenue (Estimated Deferred Revenue) (Details) - USD ($) $ in Millions |
Dec. 31, 2020 |
Dec. 31, 2019 |
|---|---|---|
| Fiscal year ended: | ||
| 2021 | $ 235 | |
| 2022 | 33 | |
| 2023 | 16 | |
| 2024 | 12 | |
| 2025 | 7 | |
| 2026 and thereafter | 3 | |
| Total | 306 | $ 274 |
| Initial Listing Revenues | ||
| Fiscal year ended: | ||
| 2021 | 35 | |
| 2022 | 23 | |
| 2023 | 13 | |
| 2024 | 10 | |
| 2025 | 7 | |
| 2026 and thereafter | 3 | |
| Total | 91 | 69 |
| Annual Listings Revenues | ||
| Fiscal year ended: | ||
| 2021 | 2 | |
| 2022 | 0 | |
| 2023 | 0 | |
| 2024 | 0 | |
| 2025 | 0 | |
| 2026 and thereafter | 0 | |
| Total | 2 | 2 |
| IR & ESG Services Revenues | ||
| Fiscal year ended: | ||
| 2021 | 42 | |
| 2022 | 4 | |
| 2023 | 0 | |
| 2024 | 0 | |
| 2025 | 0 | |
| 2026 and thereafter | 0 | |
| Total | 46 | 41 |
| Investment Intelligence Revenues | ||
| Fiscal year ended: | ||
| 2021 | 95 | |
| 2022 | 2 | |
| 2023 | 0 | |
| 2024 | 0 | |
| 2025 | 0 | |
| 2026 and thereafter | 0 | |
| Total | 97 | 82 |
| Market Technology Revenues | ||
| Fiscal year ended: | ||
| 2021 | 51 | |
| 2022 | 2 | |
| 2023 | 0 | |
| 2024 | 0 | |
| 2025 | 0 | |
| 2026 and thereafter | 0 | |
| Total | 53 | 66 |
| Other | ||
| Fiscal year ended: | ||
| 2021 | 10 | |
| 2022 | 2 | |
| 2023 | 3 | |
| 2024 | 2 | |
| 2025 | 0 | |
| 2026 and thereafter | 0 | |
| Total | $ 17 | $ 14 |