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Goodwill and Other Intangible Assets - Schedule of Goodwill Rollforward (Details)
$ in Millions
 9 Months Ended
Sep. 30, 2025
USD ($)
Goodwill [Roll Forward]  
Goodwill, beginning balance $ 30,595
Acquisitions 12
Foreign currency translation 37
Other activity, net (1)
Goodwill, ending balance 30,643
Exchanges Segment  
Goodwill [Roll Forward]  
Goodwill, beginning balance 8,136
Acquisitions 1
Foreign currency translation 35
Other activity, net 0
Goodwill, ending balance 8,172
Fixed Income and Data Services Segment  
Goodwill [Roll Forward]  
Goodwill, beginning balance 4,853
Acquisitions 7
Foreign currency translation 3
Other activity, net 0
Goodwill, ending balance 4,863
Mortgage Technology Segment  
Goodwill [Roll Forward]  
Goodwill, beginning balance 17,606
Acquisitions 4
Foreign currency translation (1)
Other activity, net (1)
Goodwill, ending balance $ 17,608