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Commitments and Contingencies - Narrative (Details) $ in Millions		3 Months Ended
	Feb. 02, 2021 plaintiff	Mar. 31, 2024 USD ($)	Mar. 31, 2023 USD ($)
Loss Contingencies [Line Items]
Period of lease extension options		15 years
Option to terminate lease, period		1 year
Revenue		$ 3,491	$ 3,160
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%
S&P DJ Indices | CME Group
Loss Contingencies [Line Items]
Noncontrolling interest ownership by noncontrolling owners percentage		27.00%
S&P DJ Indices | Related Party
Loss Contingencies [Line Items]
Revenue		$ 48	$ 44
Minimum
Loss Contingencies [Line Items]
Remaining lease terms		1 year
Maximum
Loss Contingencies [Line Items]
Remaining lease terms		11 years

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