Revenue Recognition - Schedule of Revenue Recognition (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Disaggregation of Revenue [Line Items]
Total revenues	$ 12,640	$ 11,761	$ 9,903
Transaction-based expenses	2,709	2,482	1,915
Revenues, less transaction-based expenses:	9,931	9,279	7,988
Exchanges Segment
Disaggregation of Revenue [Line Items]
Total revenues	8,120	7,441	6,355
Transaction-based expenses	2,709	2,482	1,915
Revenues, less transaction-based expenses:	5,411	4,959	4,440
Fixed Income and Data Services Segment
Disaggregation of Revenue [Line Items]
Total revenues	2,419	2,298	2,231
Transaction-based expenses	0	0	0
Revenues, less transaction-based expenses:	2,419	2,298	2,231
Mortgage Technology Segment
Disaggregation of Revenue [Line Items]
Total revenues	2,101	2,022	1,317
Transaction-based expenses	0	0	0
Revenues, less transaction-based expenses:	2,101	2,022	1,317
Services transferred at a point in time
Disaggregation of Revenue [Line Items]
Revenues, less transaction-based expenses:	4,268	3,908	3,370
Services transferred at a point in time | Exchanges Segment
Disaggregation of Revenue [Line Items]
Revenues, less transaction-based expenses:	3,327	3,030	2,576
Services transferred at a point in time | Fixed Income and Data Services Segment
Disaggregation of Revenue [Line Items]
Revenues, less transaction-based expenses:	427	427	453
Services transferred at a point in time | Mortgage Technology Segment
Disaggregation of Revenue [Line Items]
Revenues, less transaction-based expenses:	514	451	341
Services transferred over time
Disaggregation of Revenue [Line Items]
Revenues, less transaction-based expenses:	5,663	5,371	4,618
Services transferred over time | Exchanges Segment
Disaggregation of Revenue [Line Items]
Revenues, less transaction-based expenses:	2,084	1,929	1,864
Services transferred over time | Fixed Income and Data Services Segment
Disaggregation of Revenue [Line Items]
Revenues, less transaction-based expenses:	1,992	1,871	1,778
Services transferred over time | Mortgage Technology Segment
Disaggregation of Revenue [Line Items]
Revenues, less transaction-based expenses:	1,587	1,571	976
Data and connectivity services
Disaggregation of Revenue [Line Items]
Total revenues	1,031	947	933
Data and connectivity services | Exchanges Segment
Disaggregation of Revenue [Line Items]
Total revenues	1,031	947	933
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:	1,031	947	933
Data and connectivity services | Services transferred over time | Fixed Income and Data Services Segment
Disaggregation of Revenue [Line Items]
Revenues, less transaction-based expenses:	1,956	1,838	1,747
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:	423	376	312
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:	36	33	31
Listing revenue | Services transferred over time | Exchanges Segment
Disaggregation of Revenue [Line Items]
Revenues, less transaction-based expenses:	495	489	497
Regulatory fees, trading permits, and software licenses | Services transferred over time | Exchanges Segment
Disaggregation of Revenue [Line Items]
Revenues, less transaction-based expenses:	135	117	122
Recurring revenues | Services transferred over time | Mortgage Technology Segment
Disaggregation of Revenue [Line Items]
Revenues, less transaction-based expenses:	1,574	1,555	961
Other | Services transferred over time | Mortgage Technology Segment
Disaggregation of Revenue [Line Items]
Revenues, less transaction-based expenses:	13	16	15
Product And Service, Net Interest Income | Exchanges Segment
Disaggregation of Revenue [Line Items]
Total revenues	102	100	84
Product And Service, Net Interest Income | Fixed Income and Data Services Segment
Disaggregation of Revenue [Line Items]
Total revenues	$ 107	$ 137	$ 157