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Commitments and Contingencies (Details) $ in Millions | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2017 USD ($) lawsuit | Jun. 30, 2017 USD ($) lawsuit | Jan. 31, 2016 employee | Aug. 31, 2015 shareholder
Financial Crisis Litigation |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Number of lawsuits | lawsuit | 7 | 7 |  |
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 | $ | $ 20 | $ 38 |  |
Noncontrolling interest ownership by noncontrolling owners (as a percent) | 27.00% | 27.00% |  |
S&P Global Ratings | Shareholder Derivative Action |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Number of former employees named as defendants | employee |  |  | 9 |

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