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Equity - Redeemable Noncontrolling Interests (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2019 USD ($)
Noncontrolling Interest [Line Items] |
Interest in joint venture minimum (as a percent) | 20.00%
Change in control period | 15 days
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward] |
Balance as of December 31, 2018 | $ 1,620
Net income attributable to noncontrolling interest | 170
Capital contribution from noncontrolling interest | 36
Distributions to noncontrolling interest | (166)
Redemption value adjustment | 608
Balance as of December 31, 2019 | $ 2,268
CME Group |
Noncontrolling Interest [Line Items] |
Noncontrolling interest ownership by noncontrolling owners (as a percent) | 27.00%

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