Revenue Recognition - Schedule of Revenue Recognition (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Disaggregation of Revenue [Line Items]
Total revenues	$ 11,761	$ 9,903	$ 9,636
Transaction-based expenses	2,482	1,915	2,344
Revenues, less transaction-based expenses:	9,279	7,988	7,292
Exchanges Segment
Disaggregation of Revenue [Line Items]
Total revenues	7,441	6,355	6,415
Transaction-based expenses	2,482	1,915	2,344
Revenues, less transaction-based expenses:	4,959	4,440	4,071
Fixed Income and Data Services Segment
Disaggregation of Revenue [Line Items]
Total revenues	2,298	2,231	2,092
Transaction-based expenses	0	0	0
Revenues, less transaction-based expenses:	2,298	2,231	2,092
Mortgage Technology Segment
Disaggregation of Revenue [Line Items]
Total revenues	2,022	1,317	1,129
Transaction-based expenses	0	0	0
Revenues, less transaction-based expenses:	2,022	1,317	1,129
Services transferred at a point in time
Disaggregation of Revenue [Line Items]
Revenues, less transaction-based expenses:	3,908	3,370	3,132
Services transferred at a point in time \| Exchanges Segment
Disaggregation of Revenue [Line Items]
Revenues, less transaction-based expenses:	3,030	2,576	2,307
Services transferred at a point in time \| Fixed Income and Data Services Segment
Disaggregation of Revenue [Line Items]
Revenues, less transaction-based expenses:	427	453	370
Services transferred at a point in time \| Mortgage Technology Segment
Disaggregation of Revenue [Line Items]
Revenues, less transaction-based expenses:	451	341	455
Services transferred over time
Disaggregation of Revenue [Line Items]
Revenues, less transaction-based expenses:	5,371	4,618	4,160
Services transferred over time \| Exchanges Segment
Disaggregation of Revenue [Line Items]
Revenues, less transaction-based expenses:	1,929	1,864	1,764
Services transferred over time \| Fixed Income and Data Services Segment
Disaggregation of Revenue [Line Items]
Revenues, less transaction-based expenses:	1,871	1,778	1,722
Services transferred over time \| Mortgage Technology Segment
Disaggregation of Revenue [Line Items]
Revenues, less transaction-based expenses:	1,571	976	674
Data and connectivity services
Disaggregation of Revenue [Line Items]
Total revenues	947	933	877
Data and connectivity services \| Exchanges Segment
Disaggregation of Revenue [Line Items]
Total revenues	947	933	877
Data and connectivity services \| Fixed Income and Data Services Segment
Disaggregation of Revenue [Line Items]
Total revenues	0	0	0
Data and connectivity services \| Mortgage Technology Segment
Disaggregation of Revenue [Line Items]
Total revenues	0	0	0
Data and connectivity services \| Services transferred over time \| Exchanges Segment
Disaggregation of Revenue [Line Items]
Revenues, less transaction-based expenses:	947	933	877
Data and connectivity services \| Services transferred over time \| Fixed Income and Data Services Segment
Disaggregation of Revenue [Line Items]
Revenues, less transaction-based expenses:	1,838	1,747	1,686
Risk management of open interest performance obligations in our CDS business \| Services transferred over time \| Exchanges Segment
Disaggregation of Revenue [Line Items]
Revenues, less transaction-based expenses:	376	312	262
Risk management of open interest performance obligations in our CDS business \| Services transferred over time \| Fixed Income and Data Services Segment
Disaggregation of Revenue [Line Items]
Revenues, less transaction-based expenses:	33	31	36
Listing revenue \| Services transferred over time \| Exchanges Segment
Disaggregation of Revenue [Line Items]
Revenues, less transaction-based expenses:	489	497	515
Regulatory fees, trading permits, and software licenses \| Services transferred over time \| Exchanges Segment
Disaggregation of Revenue [Line Items]
Revenues, less transaction-based expenses:	117	122	110
Recurring revenues \| Services transferred over time \| Mortgage Technology Segment
Disaggregation of Revenue [Line Items]
Revenues, less transaction-based expenses:	1,555	961	643
Other \| Services transferred over time \| Mortgage Technology Segment
Disaggregation of Revenue [Line Items]
Revenues, less transaction-based expenses:	16	15	31
Product And Service, Net Interest Income \| Exchanges Segment
Disaggregation of Revenue [Line Items]
Total revenues	100	84	149
Product And Service, Net Interest Income \| Fixed Income and Data Services Segment
Disaggregation of Revenue [Line Items]
Total revenues	$ 137	$ 157	$ 86