Revenue Recognition - Schedule of Revenue Recognition (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Disaggregation of Revenue [Line Items]
Total revenues	$ 2,413	$ 2,134	$ 4,872	$ 4,563
Transaction-based expenses	599	427	1,159	1,059
Total revenues, less transaction-based expenses	1,814	1,707	3,713	3,504
Data services revenues
Disaggregation of Revenue [Line Items]
Total revenues	218	208	432	415
Exchanges Segment
Disaggregation of Revenue [Line Items]
Total revenues	1,604	1,336	3,247	2,942
Transaction-based expenses	599	427	1,159	1,059
Total revenues, less transaction-based expenses	1,005	909	2,088	1,883
Exchanges Segment | Data services revenues
Disaggregation of Revenue [Line Items]
Total revenues	218	208	432	415
Fixed Income and Data Services Segment
Disaggregation of Revenue [Line Items]
Total revenues	512	458	1,021	926
Transaction-based expenses	0	0	0	0
Total revenues, less transaction-based expenses	512	458	1,021	926
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	297	340	604	695
Transaction-based expenses	0	0	0	0
Total revenues, less transaction-based expenses	297	340	604	695
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	774	738	1,626	1,580
Services transferred at a point in time | Exchanges Segment
Disaggregation of Revenue [Line Items]
Total revenues, less transaction-based expenses	563	495	1,197	1,056
Services transferred at a point in time | Fixed Income and Data Services Segment
Disaggregation of Revenue [Line Items]
Total revenues, less transaction-based expenses	83	47	159	107
Services transferred at a point in time | Mortgage Technology Segment
Disaggregation of Revenue [Line Items]
Total revenues, less transaction-based expenses	128	196	270	417
Services transferred over time
Disaggregation of Revenue [Line Items]
Total revenues, less transaction-based expenses	1,040	969	2,087	1,924
Services transferred over time | Exchanges Segment
Disaggregation of Revenue [Line Items]
Total revenues, less transaction-based expenses	442	414	891	827
Services transferred over time | Exchanges Segment | Data services revenues
Disaggregation of Revenue [Line Items]
Total revenues, less transaction-based expenses	218	208	432	415
Services transferred over time | Exchanges Segment | Interest rates and other financial futures and options contracts
Disaggregation of Revenue [Line Items]
Total revenues, less transaction-based expenses	63	59	139	125
Services transferred over time | Exchanges Segment | Listing revenue
Disaggregation of Revenue [Line Items]
Total revenues, less transaction-based expenses	131	119	260	233
Services transferred over time | Exchanges Segment | Regulatory fees, trading permits, and software licenses
Disaggregation of Revenue [Line Items]
Total revenues, less transaction-based expenses	30	28	60	54
Services transferred over time | Fixed Income and Data Services Segment
Disaggregation of Revenue [Line Items]
Total revenues, less transaction-based expenses	429	411	862	819
Services transferred over time | Fixed Income and Data Services Segment | Data services revenues
Disaggregation of Revenue [Line Items]
Total revenues, less transaction-based expenses	421	407	843	806
Services transferred over time | Fixed Income and Data Services Segment | Interest rates and other financial futures and options contracts
Disaggregation of Revenue [Line Items]
Total revenues, less transaction-based expenses	8	4	19	13
Services transferred over time | Mortgage Technology Segment
Disaggregation of Revenue [Line Items]
Total revenues, less transaction-based expenses	169	144	334	278
Services transferred over time | Mortgage Technology Segment | Subscription revenues
Disaggregation of Revenue [Line Items]
Total revenues, less transaction-based expenses	159	134	312	258
Services transferred over time | Mortgage Technology Segment | Professional service revenues and other
Disaggregation of Revenue [Line Items]
Total revenues, less transaction-based expenses	$ 10	$ 10	$ 22	$ 20