Segment Reporting - Schedule of Segment Reporting Information (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2025	Mar. 31, 2024
Segment Reporting Information [Line Items]
Total revenues	$ 3,229	$ 2,801
Transaction-based expenses	756	511
Total revenues, less transaction-based expenses	2,473	2,290
Total operating expenses	1,252	1,227
Operating income/(loss)	1,221	1,063
Other Expenses	831	810
Depreciation and amortization	389	381
Acquisition-related transaction and integration costs	32	36
Nonoperating Income (Expense)	(154)	(99)
Income before income tax expense	1,067	964
Exchanges Segment
Segment Reporting Information [Line Items]
Total revenues	2,123	1,734
Transaction-based expenses	756	511
Total revenues, less transaction-based expenses	1,367	1,223
Total operating expenses	354	326
Operating income/(loss)	1,013	897
Other Expenses	290	256
Depreciation and amortization	63	70
Acquisition-related transaction and integration costs	1	0
Fixed Income and Data Services Segment
Segment Reporting Information [Line Items]
Total revenues	596	568
Transaction-based expenses	0	0
Total revenues, less transaction-based expenses	596	568
Total operating expenses	361	354
Operating income/(loss)	235	214
Other Expenses	277	274
Depreciation and amortization	84	80
Acquisition-related transaction and integration costs	0	0
Mortgage Technology Segment
Segment Reporting Information [Line Items]
Total revenues	510	499
Transaction-based expenses	0	0
Total revenues, less transaction-based expenses	510	499
Total operating expenses	537	547
Operating income/(loss)	(27)	(48)
Other Expenses	264	280
Depreciation and amortization	242	231
Acquisition-related transaction and integration costs	31	36
Energy futures and options
Segment Reporting Information [Line Items]
Total revenues	557	457
Energy futures and options \| Exchanges Segment
Segment Reporting Information [Line Items]
Total revenues	557	457
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	64	72
Agricultural and metals futures and options \| Exchanges Segment
Segment Reporting Information [Line Items]
Total revenues	64	72
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	156	135
Financial futures and options \| Exchanges Segment
Segment Reporting Information [Line Items]
Total revenues	156	135
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	875	610
Cash equities and equity options \| Exchanges Segment
Segment Reporting Information [Line Items]
Total revenues	875	610
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	103
OTC and other \| Exchanges Segment
Segment Reporting Information [Line Items]
Total revenues	103	103
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	246	235
Data and connectivity services \| Exchanges Segment
Segment Reporting Information [Line Items]
Total revenues	246	235
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	122
Listings \| Exchanges Segment
Segment Reporting Information [Line Items]
Total revenues	122	122
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	31	26
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	31	26
Fixed income execution \| Mortgage Technology Segment
Segment Reporting Information [Line Items]
Total revenues	0	0
CDS clearing
Segment Reporting Information [Line Items]
Total revenues	94	93
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	94	93
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	299	288
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	299	288
Fixed income data and analytics \| Mortgage Technology Segment
Segment Reporting Information [Line Items]
Total revenues	0	0
Data and network technology
Segment Reporting Information [Line Items]
Total revenues	172	161
Data and network technology \| Exchanges Segment
Segment Reporting Information [Line Items]
Total revenues	0	0
Data and network technology \| Fixed Income and Data Services Segment
Segment Reporting Information [Line Items]
Total revenues	172	161
Data and network technology \| Mortgage Technology Segment
Segment Reporting Information [Line Items]
Total revenues	0	0
Origination technology
Segment Reporting Information [Line Items]
Total revenues	175	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	175	174
Closing solutions
Segment Reporting Information [Line Items]
Total revenues	47	44
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	47	44
Servicing software
Segment Reporting Information [Line Items]
Total revenues	221	214
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	221	214
Data and analytics
Segment Reporting Information [Line Items]
Total revenues	67	67
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	$ 67

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