Commitments and Contingencies - Narrative (Details) $ in Millions			3 Months Ended	12 Months Ended
	Feb. 28, 2022 USD ($)	Feb. 02, 2021 entity	Mar. 31, 2023 USD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Loss Contingencies [Line Items]
Option to extend lease period				15 years
Period of options to terminate lease				1 year
Lease impairment charges				$ 26	$ 132	$ 31
Revenue				$ 12,497	11,181	8,297
Amazon Web Services
Loss Contingencies [Line Items]
Collaborative arrangement, purchase obligation			$ 1,000
Collaborative arrangement, contractual period			5 years
Basis Capital Investment Group, Investment Losses On Collateralized Debt Obligations
Loss Contingencies [Line Items]
Loss contingency, number of plaintiffs | entity		2
CME Group
Loss Contingencies [Line Items]
Noncontrolling interest ownership by noncontrolling owners (as a percent)				27.00%
S&P/DJ Indices | CME Group
Loss Contingencies [Line Items]
Noncontrolling interest ownership by noncontrolling owners (as a percent)				27.00%
S&P/DJ Indices | Related Party
Loss Contingencies [Line Items]
Revenue				$ 174	$ 170	$ 139
IHS Markit Ltd
Loss Contingencies [Line Items]
Right-of-use asset obtained in business acquisition	$ 230
Operating lease liability incurred in business acquisition	$ 268
Minimum
Loss Contingencies [Line Items]
Remaining lease terms				1 year
Maximum
Loss Contingencies [Line Items]
Remaining lease terms				10 years