Deferred Revenue (Changes in Deferred Revenue) (Details) $ in Millions	3 Months Ended
	Mar. 31, 2022 USD ($)
Change in Contract with Customer Liability [Roll Forward]
Beginning balance	$ 448
Additions	435
Revenue Recognized	(145)
Adjustments	(3)
Ending balance	735
Market Technology
Change in Contract with Customer Liability [Roll Forward]
Beginning balance	117
Additions	53
Revenue Recognized	(57)
Adjustments	(2)
Ending balance	111
Investment Intelligence
Change in Contract with Customer Liability [Roll Forward]
Beginning balance	106
Additions	61
Revenue Recognized	(41)
Adjustments	0
Ending balance	126
Initial Listing
Change in Contract with Customer Liability [Roll Forward]
Beginning balance	145
Additions	16
Revenue Recognized	(19)
Adjustments	(1)
Ending balance	141
Annual Listings
Change in Contract with Customer Liability [Roll Forward]
Beginning balance	2
Additions	267
Revenue Recognized	0
Adjustments	1
Ending balance	270
Other
Change in Contract with Customer Liability [Roll Forward]
Beginning balance	21
Additions	8
Revenue Recognized	(4)
Adjustments	(1)
Ending balance	24
IR & ESG Services
Change in Contract with Customer Liability [Roll Forward]
Beginning balance	57
Additions	30
Revenue Recognized	(24)
Adjustments	0
Ending balance	$ 63