Revenue Recognition - Schedule of Revenue Recognition (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Disaggregation of Revenue [Line Items]
Total revenues	$ 2,336	$ 2,413	$ 4,808	$ 4,872
Transaction-based expenses	448	599	1,024	1,159
Total revenues, less transaction-based expenses	1,888	1,814	3,784	3,713
Data services revenues
Disaggregation of Revenue [Line Items]
Total revenues	231	218	463	432
Exchanges Segment
Disaggregation of Revenue [Line Items]
Total revenues	1,541	1,604	3,214	3,247
Transaction-based expenses	448	599	1,024	1,159
Total revenues, less transaction-based expenses	1,093	1,005	2,190	2,088
Exchanges Segment | Data services revenues
Disaggregation of Revenue [Line Items]
Total revenues	231	218	463	432
Fixed Income and Data Services Segment
Disaggregation of Revenue [Line Items]
Total revenues	546	512	1,109	1,021
Transaction-based expenses	0	0	0	0
Total revenues, less transaction-based expenses	546	512	1,109	1,021
Fixed Income and Data Services Segment | Data services revenues
Disaggregation of Revenue [Line Items]
Total revenues	0	0	0	0
Mortgage Technology Segment
Disaggregation of Revenue [Line Items]
Total revenues	249	297	485	604
Transaction-based expenses	0	0	0	0
Total revenues, less transaction-based expenses	249	297	485	604
Mortgage Technology Segment | Data services revenues
Disaggregation of Revenue [Line Items]
Total revenues	0	0	0	0
Services transferred at a point in time
Disaggregation of Revenue [Line Items]
Total revenues, less transaction-based expenses	815	774	1,640	1,626
Services transferred at a point in time | Exchanges Segment
Disaggregation of Revenue [Line Items]
Total revenues, less transaction-based expenses	628	563	1,263	1,197
Services transferred at a point in time | Fixed Income and Data Services Segment
Disaggregation of Revenue [Line Items]
Total revenues, less transaction-based expenses	106	83	229	159
Services transferred at a point in time | Mortgage Technology Segment
Disaggregation of Revenue [Line Items]
Total revenues, less transaction-based expenses	81	128	148	270
Services transferred over time
Disaggregation of Revenue [Line Items]
Total revenues, less transaction-based expenses	1,073	1,040	2,144	2,087
Services transferred over time | Exchanges Segment
Disaggregation of Revenue [Line Items]
Total revenues, less transaction-based expenses	465	442	927	891
Services transferred over time | Exchanges Segment | Data services revenues
Disaggregation of Revenue [Line Items]
Total revenues, less transaction-based expenses	231	218	463	432
Services transferred over time | Exchanges Segment | Services transferred over time related to risk management of open interest performance obligations
Disaggregation of Revenue [Line Items]
Total revenues, less transaction-based expenses	75	63	151	139
Services transferred over time | Exchanges Segment | Services transferred over time related to listings
Disaggregation of Revenue [Line Items]
Total revenues, less transaction-based expenses	126	131	252	260
Services transferred over time | Exchanges Segment | Services transferred over time related to regulatory fees, trading permits, and software licenses
Disaggregation of Revenue [Line Items]
Total revenues, less transaction-based expenses	33	30	61	60
Services transferred over time | Fixed Income and Data Services Segment
Disaggregation of Revenue [Line Items]
Total revenues, less transaction-based expenses	440	429	880	862
Services transferred over time | Fixed Income and Data Services Segment | Data services revenues
Disaggregation of Revenue [Line Items]
Total revenues, less transaction-based expenses	434	421	864	843
Services transferred over time | Fixed Income and Data Services Segment | Services transferred over time related to risk management of open interest performance obligations
Disaggregation of Revenue [Line Items]
Total revenues, less transaction-based expenses	6	8	16	19
Services transferred over time | Mortgage Technology Segment
Disaggregation of Revenue [Line Items]
Total revenues, less transaction-based expenses	168	169	337	334
Services transferred over time | Mortgage Technology Segment | Subscription revenues
Disaggregation of Revenue [Line Items]
Total revenues, less transaction-based expenses	164	160	329	316
Services transferred over time | Mortgage Technology Segment | Professional service revenues and other
Disaggregation of Revenue [Line Items]
Total revenues, less transaction-based expenses	$ 4	$ 9	$ 8	$ 18