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Performance Bonds and Guaranty Fund Contributions (Narrative) (Details) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2023 USD ($) days | Dec. 31, 2022 USD ($)
Percentage share of cross-margining collateral | 50.00% |
Line of Credit, Guaranty Fund Collateral Available | $ 8,600.0 |
Days fully secured | days | 364 |
Intraday settlements of cash performance bonds | $ 237.5 | $ 436.7
Average daily clearing settlement | 5,900.0 |
364-day fully secured, committed line of credit |  |
Line of Credit Facility, Maximum Borrowing Capacity | 7,000.0 |
Option on increase in line of credit | 10,000.0 |
Revolving senior credit facility |  |
Line of Credit Facility, Maximum Borrowing Capacity | 2,300.0 |
CME Base Guaranty Fund [Member] |  |
Corporate Contribution | 100.0 |
CME IRS Guaranty Fund [Member] [Member] |  |
Corporate Contribution | 150.0 |
Federal Reserve Reinvestment [Member] |  |
Cash Equivalents, at Carrying Value | $ 79,300.0 | $ 124,900.0

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- Definition Amount of short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(2)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479440/944-210-S99-1 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(1)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 + Details
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