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Commitments and Contingencies - Narrative (Details) $ in Millions |  | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
Feb. 02, 2021 plaintiff | Jun. 30, 2024 USD ($) | Jun. 30, 2023 USD ($) | Jun. 30, 2024 USD ($) | Jun. 30, 2023 USD ($)
Loss Contingencies [Line Items] |  |  |  |  |
Period of lease extension options |  | 15 years |  | 15 years |
Option to terminate lease, period |  |  |  | 1 year |
Revenue |  | $ 3,549 | $ 3,101 | $ 7,040 | $ 6,261
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 |  | $ 48 | $ 45 | $ 96 | $ 89
Minimum |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Remaining lease terms |  | 1 year |  | 1 year |
Maximum |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Remaining lease terms |  | 11 years |  | 11 years |

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