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Goodwill and Other Intangible Assets - Schedule of Goodwill Rollforward (Details)
$ in Millions
 9 Months Ended
Sep. 30, 2024
USD ($)
Goodwill [Roll Forward]  
Goodwill, beginning balance $ 30,553
Acquisition 4
Foreign currency translation 17
Other activity, net 24
Goodwill, ending balance 30,598
Exchanges Segment  
Goodwill [Roll Forward]  
Goodwill, beginning balance 8,155
Acquisition 0
Foreign currency translation 15
Other activity, net 0
Goodwill, ending balance 8,170
Fixed Income and Data Services Segment  
Goodwill [Roll Forward]  
Goodwill, beginning balance 4,854
Acquisition 0
Foreign currency translation 2
Other activity, net 0
Goodwill, ending balance 4,856
Mortgage Technology Segment  
Goodwill [Roll Forward]  
Goodwill, beginning balance 17,544
Acquisition 4
Foreign currency translation 0
Other activity, net 24
Goodwill, ending balance $ 17,572