Goodwill and Other Intangible Assets - Schedule of Goodwill Rollforward (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024
Goodwill [Roll Forward]
Goodwill, beginning balance	$ 30,595	$ 30,553
Acquisitions	12	39
Foreign currency translation	39	(21)
Other activity, net	0	24
Goodwill, ending balance	30,646	30,595
Exchanges
Goodwill [Roll Forward]
Goodwill, beginning balance	8,136	8,155
Acquisitions	1	0
Foreign currency translation	38	(19)
Other activity, net	0	0
Goodwill, ending balance	8,175	8,136
Fixed Income and Data Services
Goodwill [Roll Forward]
Goodwill, beginning balance	4,853	4,854
Acquisitions	7	0
Foreign currency translation	3	(1)
Other activity, net	1	0
Goodwill, ending balance	4,864	4,853
Mortgage Technology
Goodwill [Roll Forward]
Goodwill, beginning balance	17,606	17,544
Acquisitions	4	39
Foreign currency translation	(2)	(1)
Other activity, net	(1)	24
Goodwill, ending balance	$ 17,607	$ 17,606