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Commitments and Contingencies - Narrative (Details) - USD ($) $ in Millions | 1 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Mar. 31, 2018 | Sep. 30, 2019 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Loss Contingencies [Line Items] |  |  |  |  |
Period of lease extension options |  | 12 years |  |  |
Period of options to terminate lease |  | 1 year |  |  |
Affiliated Entity |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Contribution to noncontrolling interest | $ 20 |  |  |  |
CME Group | S&P/DJ Indices |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Revenues earned under license agreement |  |  | $ 114 | $ 121 | $ 74
CME Group |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Noncontrolling interest ownership by noncontrolling owners (as a percent) |  |  | 27.00% |  |
CME Group | S&P/DJ Indices |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Noncontrolling interest ownership by noncontrolling owners (as a percent) |  |  | 27.00% |  |
Minimum |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Remaining lease terms |  | 1 year |  |  |
Maximum |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Remaining lease terms |  | 14 years |  |  |

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