Revenue Recognition - Schedule of Revenue Recognition (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Disaggregation of Revenue [Line Items]
Total revenues	$ 2,387	$ 2,277	$ 7,259	$ 6,840
Transaction-based expenses	576	475	1,735	1,534
Total revenues, less transaction-based expenses	1,811	1,802	5,524	5,306
Data services revenues
Disaggregation of Revenue [Line Items]
Total revenues	219	208	651	623
Exchanges Segment
Disaggregation of Revenue [Line Items]
Total revenues	1,577	1,434	4,824	4,376
Transaction-based expenses	576	475	1,735	1,534
Total revenues, less transaction-based expenses	1,001	959	3,089	2,842
Exchanges Segment | Data services revenues
Disaggregation of Revenue [Line Items]
Total revenues	219	208	651	623
Fixed Income and Data Services Segment
Disaggregation of Revenue [Line Items]
Total revenues	534	477	1,555	1,403
Transaction-based expenses	0	0	0	0
Total revenues, less transaction-based expenses	534	477	1,555	1,403
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	276	366	880	1,061
Transaction-based expenses	0	0	0	0
Total revenues, less transaction-based expenses	276	366	880	1,061
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	771	803	2,397	2,383
Services transferred at a point in time | Exchanges Segment
Disaggregation of Revenue [Line Items]
Total revenues, less transaction-based expenses	563	534	1,760	1,590
Services transferred at a point in time | Fixed Income and Data Services Segment
Disaggregation of Revenue [Line Items]
Total revenues, less transaction-based expenses	104	55	263	162
Services transferred at a point in time | Mortgage Technology Segment
Disaggregation of Revenue [Line Items]
Total revenues, less transaction-based expenses	104	214	374	631
Services transferred over time
Disaggregation of Revenue [Line Items]
Total revenues, less transaction-based expenses	1,040	999	3,127	2,923
Services transferred over time | Exchanges Segment
Disaggregation of Revenue [Line Items]
Total revenues, less transaction-based expenses	438	425	1,329	1,252
Services transferred over time | Exchanges Segment | Data services revenues
Disaggregation of Revenue [Line Items]
Total revenues, less transaction-based expenses	219	208	651	623
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	62	65	201	190
Services transferred over time | Exchanges Segment | Listing revenue
Disaggregation of Revenue [Line Items]
Total revenues, less transaction-based expenses	128	123	388	356
Services transferred over time | Exchanges Segment | Regulatory fees, trading permits, and software licenses
Disaggregation of Revenue [Line Items]
Total revenues, less transaction-based expenses	29	29	89	83
Services transferred over time | Fixed Income and Data Services Segment
Disaggregation of Revenue [Line Items]
Total revenues, less transaction-based expenses	430	422	1,292	1,241
Services transferred over time | Fixed Income and Data Services Segment | Data services revenues
Disaggregation of Revenue [Line Items]
Total revenues, less transaction-based expenses	420	414	1,263	1,220
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	10	8	29	21
Services transferred over time | Mortgage Technology Segment
Disaggregation of Revenue [Line Items]
Total revenues, less transaction-based expenses	172	152	506	430
Services transferred over time | Mortgage Technology Segment | Subscription revenues
Disaggregation of Revenue [Line Items]
Total revenues, less transaction-based expenses	163	143	479	404
Services transferred over time | Mortgage Technology Segment | Professional service revenues and other
Disaggregation of Revenue [Line Items]
Total revenues, less transaction-based expenses	$ 9	$ 9	$ 27	$ 26