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Commitments and Contingencies - Narrative (Details) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Aug. 30, 2015 shareholder
Loss Contingencies [Line Items] |  |  |  |
Noncontrolling interest ownership by noncontrolling owners (as a percent) | 27.00% |  |  |
Shareholder Derivative Action |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Number of shareholders commencing punitive derivative action | shareholder |  |  |  | 2
CME Group | S&P/DJ Indices |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Revenues earned under license agreement | $ | $ 74 | $ 76 | $ 63 |
Noncontrolling interest ownership by noncontrolling owners (as a percent) | 27.00% |  |  |

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