Deferred Revenue - Schedule of Changes in Deferred Revenue (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024
Disaggregation Of Revenue [Roll Forward]
Deferred revenue, beginning balance	$ 333	$ 307
Additions	972	1,047
Amortization	(1,013)	(1,021)
Deferred revenue, ending balance	292	333
Listing Revenues
Disaggregation Of Revenue [Roll Forward]
Deferred revenue, beginning balance	119	108
Additions	495	500
Amortization	(495)	(489)
Deferred revenue, ending balance	119	119
Data Services and Other Revenues
Disaggregation Of Revenue [Roll Forward]
Deferred revenue, beginning balance	130	93
Additions	339	400
Amortization	(368)	(363)
Deferred revenue, ending balance	101	130
Mortgage Technology
Disaggregation Of Revenue [Roll Forward]
Deferred revenue, beginning balance	84	106
Additions	138	147
Amortization	(150)	(169)
Deferred revenue, ending balance	$ 72	$ 84