Deferred Revenue (Changes in Deferred Revenue) (Details) $ in Millions	9 Months Ended
	Sep. 30, 2025 USD ($)
Change in Contract with Customer Liability [Roll Forward]
Beginning balance	$ 788
Additions	608
Revenue Recognized	(612)
Foreign Currency Translation	17
Ending balance	801
Initial Listings
Change in Contract with Customer Liability [Roll Forward]
Beginning balance	89
Additions	30
Revenue Recognized	(26)
Foreign Currency Translation	3
Ending balance	96
Annual Listings
Change in Contract with Customer Liability [Roll Forward]
Beginning balance	2
Additions	92
Revenue Recognized	(1)
Foreign Currency Translation	4
Ending balance	97
Workflow & Insights
Change in Contract with Customer Liability [Roll Forward]
Beginning balance	194
Additions	174
Revenue Recognized	(164)
Foreign Currency Translation	1
Ending balance	205
Other
Change in Contract with Customer Liability [Roll Forward]
Beginning balance	22
Additions	12
Revenue Recognized	(11)
Foreign Currency Translation	3
Ending balance	26
Financial Crime Management Technology
Change in Contract with Customer Liability [Roll Forward]
Beginning balance	148
Additions	129
Revenue Recognized	(130)
Foreign Currency Translation	0
Ending balance	147
Regulatory Technology
Change in Contract with Customer Liability [Roll Forward]
Beginning balance	147
Additions	100
Revenue Recognized	(129)
Foreign Currency Translation	1
Ending balance	119
Capital Markets Technology
Change in Contract with Customer Liability [Roll Forward]
Beginning balance	186
Additions	71
Revenue Recognized	(151)
Foreign Currency Translation	5
Ending balance	$ 111