Goodwill and Other Intangible Assets - Schedule of Goodwill Rollforward (Details) $ in Millions	3 Months Ended
	Mar. 31, 2026 USD ($)
Goodwill [Roll Forward]
Goodwill, beginning balance	$ 30,646
Foreign currency translation	(12)
Goodwill, ending balance	30,634
Exchanges Segment
Goodwill [Roll Forward]
Goodwill, beginning balance	8,175
Foreign currency translation	(10)
Goodwill, ending balance	8,165
Fixed Income and Data Services Segment
Goodwill [Roll Forward]
Goodwill, beginning balance	4,864
Foreign currency translation	(1)
Goodwill, ending balance	4,863
Mortgage Technology Segment
Goodwill [Roll Forward]
Goodwill, beginning balance	17,607
Foreign currency translation	(1)
Goodwill, ending balance	$ 17,606