Goodwill and Other Intangible Assets - Schedule of Goodwill Rollforward (Details) $ in Millions	3 Months Ended
	Mar. 31, 2024 USD ($)
Goodwill [Roll Forward]
Goodwill, beginning balance	$ 30,553
Foreign currency translation	(8)
Other activity, net	4
Goodwill, ending balance	30,549
Exchanges Segment
Goodwill [Roll Forward]
Goodwill, beginning balance	8,155
Foreign currency translation	(8)
Other activity, net	0
Goodwill, ending balance	8,147
Fixed Income and Data Services Segment
Goodwill [Roll Forward]
Goodwill, beginning balance	4,854
Foreign currency translation	0
Other activity, net	0
Goodwill, ending balance	4,854
Mortgage Technology Segment
Goodwill [Roll Forward]
Goodwill, beginning balance	17,544
Foreign currency translation	0
Other activity, net	4
Goodwill, ending balance	$ 17,548