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Deferred Revenue (Estimated Deferred Revenue) (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Fiscal year ended:
2019	$ 194
2020	54
2021	19
2022	8
2023	5
2024 and thereafter	1
Total	281	$ 287
Initial Listing Revenues
Fiscal year ended:
2019	23
2020	20
2021	10
2022	7
2023	5
2024 and thereafter	1
Total	66	64
Annual Listings Revenues
Fiscal year ended:
2019	4
2020	0
2021	0
2022	0
2023	0
2024 and thereafter	0
Total	4	3
Market Technology Revenues
Fiscal year ended:
2019	47
2020	21
2021	7
2022	0
2023	0
2024 and thereafter	0
Total	75	109
Corporate Solutions Revenues
Fiscal year ended:
2019	33
2020	3
2021	0
2022	0
2023	0
2024 and thereafter	0
Total	36
Information Services Revenues
Fiscal year ended:
2019	77
2020	3
2021	0
2022	0
2023	0
2024 and thereafter	0
Total	80	40
Other
Fiscal year ended:
2019	10
2020	7
2021	2
2022	1
2023	0
2024 and thereafter	0
Total	$ 20	$ 34

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