Revenue Recognition - Schedule of Revenue Recognition (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Disaggregation of Revenue [Line Items]
Total revenues	$ 2,429	$ 2,387	$ 7,237	$ 7,259
Transaction-based expenses	426	576	1,450	1,735
Total revenues, less transaction-based expenses	2,003	1,811	5,787	5,524
Data services revenues
Disaggregation of Revenue [Line Items]
Total revenues	236	219	699	651
Exchanges Segment
Disaggregation of Revenue [Line Items]
Total revenues	1,540	1,577	4,754	4,824
Transaction-based expenses	426	576	1,450	1,735
Total revenues, less transaction-based expenses	1,114	1,001	3,304	3,089
Exchanges Segment | Data services revenues
Disaggregation of Revenue [Line Items]
Total revenues	236	219	699	651
Fixed Income and Data Services Segment
Disaggregation of Revenue [Line Items]
Total revenues	559	534	1,668	1,555
Transaction-based expenses	0	0	0	0
Total revenues, less transaction-based expenses	559	534	1,668	1,555
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	330	276	815	880
Transaction-based expenses	0	0	0	0
Total revenues, less transaction-based expenses	330	276	815	880
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	845	771	2,485	2,397
Services transferred at a point in time | Exchanges Segment
Disaggregation of Revenue [Line Items]
Total revenues, less transaction-based expenses	639	563	1,902	1,760
Services transferred at a point in time | Fixed Income and Data Services Segment
Disaggregation of Revenue [Line Items]
Total revenues, less transaction-based expenses	114	104	343	263
Services transferred at a point in time | Mortgage Technology Segment
Disaggregation of Revenue [Line Items]
Total revenues, less transaction-based expenses	92	104	240	374
Services transferred over time
Disaggregation of Revenue [Line Items]
Total revenues, less transaction-based expenses	1,158	1,040	3,302	3,127
Services transferred over time | Exchanges Segment
Disaggregation of Revenue [Line Items]
Total revenues, less transaction-based expenses	475	438	1,402	1,329
Services transferred over time | Exchanges Segment | Data services revenues
Disaggregation of Revenue [Line Items]
Total revenues, less transaction-based expenses	236	219	699	651
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	78	62	229	201
Services transferred over time | Exchanges Segment | Services transferred over time related to listings
Disaggregation of Revenue [Line Items]
Total revenues, less transaction-based expenses	124	128	376	388
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	37	29	98	89
Services transferred over time | Fixed Income and Data Services Segment
Disaggregation of Revenue [Line Items]
Total revenues, less transaction-based expenses	445	430	1,325	1,292
Services transferred over time | Fixed Income and Data Services Segment | Data services revenues
Disaggregation of Revenue [Line Items]
Total revenues, less transaction-based expenses	436	420	1,300	1,263
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	9	10	25	29
Services transferred over time | Mortgage Technology Segment
Disaggregation of Revenue [Line Items]
Total revenues, less transaction-based expenses	238	172	575	506
Services transferred over time | Mortgage Technology Segment | Recurring revenues
Disaggregation of Revenue [Line Items]
Total revenues, less transaction-based expenses	235	163	564	479
Services transferred over time | Mortgage Technology Segment | Other
Disaggregation of Revenue [Line Items]
Total revenues, less transaction-based expenses	$ 3	$ 9	$ 11	$ 27