Segment Reporting - Schedule of Segment Reporting Information (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Segment Reporting Information [Line Items]
Total revenues	$ 2,801	$ 2,472
Transaction-based expenses	511	576
Total revenues, less transaction-based expenses	2,290	1,896
Operating expenses	1,227	927
Operating income	1,063	969
Exchanges Segment
Segment Reporting Information [Line Items]
Total revenues	1,734	1,673
Transaction-based expenses	511	576
Total revenues, less transaction-based expenses	1,223	1,097
Operating expenses	326	320
Operating income	897	777
Fixed Income and Data Services Segment
Segment Reporting Information [Line Items]
Total revenues	568	563
Transaction-based expenses	0	0
Total revenues, less transaction-based expenses	568	563
Operating expenses	354	343
Operating income	214	220
Mortgage Technology Segment
Segment Reporting Information [Line Items]
Total revenues	499	236
Transaction-based expenses	0	0
Total revenues, less transaction-based expenses	499	236
Operating expenses	547	264
Operating income	(48)	(28)
Energy futures and options
Segment Reporting Information [Line Items]
Total revenues	457	345
Energy futures and options | Exchanges Segment
Segment Reporting Information [Line Items]
Total revenues	457	345
Energy futures and options | Fixed Income and Data Services Segment
Segment Reporting Information [Line Items]
Total revenues	0	0
Energy futures and options | Mortgage Technology Segment
Segment Reporting Information [Line Items]
Total revenues	0	0
Agricultural and metals futures and options
Segment Reporting Information [Line Items]
Total revenues	72	70
Agricultural and metals futures and options | Exchanges Segment
Segment Reporting Information [Line Items]
Total revenues	72	70
Agricultural and metals futures and options | Fixed Income and Data Services Segment
Segment Reporting Information [Line Items]
Total revenues	0	0
Agricultural and metals futures and options | Mortgage Technology Segment
Segment Reporting Information [Line Items]
Total revenues	0	0
Financial futures and options
Segment Reporting Information [Line Items]
Total revenues	135	128
Financial futures and options | Exchanges Segment
Segment Reporting Information [Line Items]
Total revenues	135	128
Financial futures and options | Fixed Income and Data Services Segment
Segment Reporting Information [Line Items]
Total revenues	0	0
Financial futures and options | Mortgage Technology Segment
Segment Reporting Information [Line Items]
Total revenues	0	0
Cash equities and equity options
Segment Reporting Information [Line Items]
Total revenues	610	671
Cash equities and equity options | Exchanges Segment
Segment Reporting Information [Line Items]
Total revenues	610	671
Cash equities and equity options | Fixed Income and Data Services Segment
Segment Reporting Information [Line Items]
Total revenues	0	0
Cash equities and equity options | Mortgage Technology Segment
Segment Reporting Information [Line Items]
Total revenues	0	0
OTC and other
Segment Reporting Information [Line Items]
Total revenues	103	101
OTC and other | Exchanges Segment
Segment Reporting Information [Line Items]
Total revenues	103	101
OTC and other | Fixed Income and Data Services Segment
Segment Reporting Information [Line Items]
Total revenues	0	0
OTC and other | Mortgage Technology Segment
Segment Reporting Information [Line Items]
Total revenues	0	0
Data and connectivity services
Segment Reporting Information [Line Items]
Total revenues	235	232
Data and connectivity services | Fixed Income and Data Services Segment
Segment Reporting Information [Line Items]
Total revenues	0	0
Data and connectivity services | Mortgage Technology Segment
Segment Reporting Information [Line Items]
Total revenues	0	0
Listings
Segment Reporting Information [Line Items]
Total revenues	122	126
Listings | Fixed Income and Data Services Segment
Segment Reporting Information [Line Items]
Total revenues	0	0
Listings | Mortgage Technology Segment
Segment Reporting Information [Line Items]
Total revenues	0	0
Fixed income execution
Segment Reporting Information [Line Items]
Total revenues	26	32
Fixed income execution | Exchanges Segment
Segment Reporting Information [Line Items]
Total revenues	0	0
Fixed income execution | Fixed Income and Data Services Segment
Segment Reporting Information [Line Items]
Total revenues	26	32
Fixed income execution | Mortgage Technology Segment
Segment Reporting Information [Line Items]
Total revenues	0	0
CDS clearing
Segment Reporting Information [Line Items]
Total revenues	93	101
CDS clearing | Exchanges Segment
Segment Reporting Information [Line Items]
Total revenues	0	0
CDS clearing | Fixed Income and Data Services Segment
Segment Reporting Information [Line Items]
Total revenues	93	101
CDS clearing | Mortgage Technology Segment
Segment Reporting Information [Line Items]
Total revenues	0	0
Fixed income data and analytics
Segment Reporting Information [Line Items]
Total revenues	288	276
Fixed income data and analytics | Exchanges Segment
Segment Reporting Information [Line Items]
Total revenues	0	0
Fixed income data and analytics | Fixed Income and Data Services Segment
Segment Reporting Information [Line Items]
Total revenues	288	276
Fixed income data and analytics | Mortgage Technology Segment
Segment Reporting Information [Line Items]
Total revenues	0	0
Other data and network services
Segment Reporting Information [Line Items]
Total revenues	161	154
Other data and network services | Exchanges Segment
Segment Reporting Information [Line Items]
Total revenues	0	0
Other data and network services | Fixed Income and Data Services Segment
Segment Reporting Information [Line Items]
Total revenues	161	154
Other data and network services | Mortgage Technology Segment
Segment Reporting Information [Line Items]
Total revenues	0	0
Origination technology
Segment Reporting Information [Line Items]
Total revenues	174	174
Origination technology | Exchanges Segment
Segment Reporting Information [Line Items]
Total revenues	0	0
Origination technology | Fixed Income and Data Services Segment
Segment Reporting Information [Line Items]
Total revenues	0	0
Origination technology | Mortgage Technology Segment
Segment Reporting Information [Line Items]
Total revenues	174	174
Closing solutions
Segment Reporting Information [Line Items]
Total revenues	44	41
Closing solutions | Exchanges Segment
Segment Reporting Information [Line Items]
Total revenues	0	0
Closing solutions | Fixed Income and Data Services Segment
Segment Reporting Information [Line Items]
Total revenues	0	0
Closing solutions | Mortgage Technology Segment
Segment Reporting Information [Line Items]
Total revenues	44	41
Servicing software
Segment Reporting Information [Line Items]
Total revenues	214	0
Servicing software | Exchanges Segment
Segment Reporting Information [Line Items]
Total revenues	0	0
Servicing software | Fixed Income and Data Services Segment
Segment Reporting Information [Line Items]
Total revenues	0	0
Servicing software | Mortgage Technology Segment
Segment Reporting Information [Line Items]
Total revenues	214	0
Data and analytics
Segment Reporting Information [Line Items]
Total revenues	67	21
Data and analytics | Exchanges Segment
Segment Reporting Information [Line Items]
Total revenues	0	0
Data and analytics | Fixed Income and Data Services Segment
Segment Reporting Information [Line Items]
Total revenues	0	0
Data and analytics | Mortgage Technology Segment
Segment Reporting Information [Line Items]
Total revenues	$ 67	$ 21