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Commitments and Contingencies - Narrative (Details) $ in Millions		3 Months Ended		6 Months Ended
	Feb. 02, 2021 plaintiff	Jun. 30, 2025 USD ($)	Jun. 30, 2024 USD ($)	Jun. 30, 2025 USD ($)	Jun. 30, 2024 USD ($)
Loss Contingencies [Line Items]
Period of lease extension options		12 years		12 years
Total estimated future lease payments		$ 64		$ 64
Revenue		$ 3,755	$ 3,549	$ 7,532	$ 7,040
Basis Capital Investment Group, Investment Losses on Collateralized Debt Obligations
Loss Contingencies [Line Items]
Number of entities \| plaintiff	2
CME Group
Loss Contingencies [Line Items]
Noncontrolling interest ownership by noncontrolling owners percentage		27.00%		27.00%
S&P DJ Indices \| CME Group
Loss Contingencies [Line Items]
Noncontrolling interest ownership by noncontrolling owners percentage		27.00%		27.00%
S&P DJ Indices \| Related Party
Loss Contingencies [Line Items]
Revenue		$ 51	$ 48	$ 103	$ 96
Minimum
Loss Contingencies [Line Items]
Remaining lease terms		1 year		1 year
Lease term		11 years		11 years
Maximum
Loss Contingencies [Line Items]
Remaining lease terms		12 years		12 years
Lease term		12 years		12 years