Goodwill and Other Intangible Assets - Schedule of Intangible Assets and Related Accumulated Amortization (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, gross	$ 10,030	$ 10,005
Less accumulated amortization	(2,814)	(2,188)
Total finite-lived intangible assets, net	7,216	7,817
Total indefinite-lived intangible assets	6,520	6,591
Other intangible assets, net	$ 13,736	14,408	$ 10,258
Useful Life (Years)	15 years 1 month 6 days
Exchange registrations, licenses and contracts with indefinite lives
Finite-Lived Intangible Assets [Line Items]
Total indefinite-lived intangible assets	$ 6,232	6,236
Trade names and trademarks with indefinite lives
Finite-Lived Intangible Assets [Line Items]
Total indefinite-lived intangible assets	280	280
In-process research and development
Finite-Lived Intangible Assets [Line Items]
Total indefinite-lived intangible assets	0	67
Other
Finite-Lived Intangible Assets [Line Items]
Total indefinite-lived intangible assets	8	8
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, gross	$ 7,958	8,011
Customer relationships | Minimum
Finite-Lived Intangible Assets [Line Items]
Useful Life (Years)	3 years
Customer relationships | Maximum
Finite-Lived Intangible Assets [Line Items]
Useful Life (Years)	25 years
Technology
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, gross	$ 1,379	1,318
Technology | Minimum
Finite-Lived Intangible Assets [Line Items]
Useful Life (Years)	2 years 6 months
Technology | Maximum
Finite-Lived Intangible Assets [Line Items]
Useful Life (Years)	11 years
Trading products with finite lives
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, gross	$ 237	237
Useful Life (Years)	20 years
Data/databases
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, gross	$ 150	150
Data/databases | Minimum
Finite-Lived Intangible Assets [Line Items]
Useful Life (Years)	4 years
Data/databases | Maximum
Finite-Lived Intangible Assets [Line Items]
Useful Life (Years)	10 years
Market data provider relationships
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, gross	$ 11	11
Useful Life (Years)	20 years
Non-compete agreements
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, gross	$ 42	42
Non-compete agreements | Minimum
Finite-Lived Intangible Assets [Line Items]
Useful Life (Years)	1 year
Non-compete agreements | Maximum
Finite-Lived Intangible Assets [Line Items]
Useful Life (Years)	5 years
Other
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, gross	$ 253	$ 236
Other | Minimum
Finite-Lived Intangible Assets [Line Items]
Useful Life (Years)	1 year
Other | Maximum
Finite-Lived Intangible Assets [Line Items]
Useful Life (Years)	5 years