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Marketable Securities - Additional Information (Details) - USD ($) | Jun. 30, 2024 | Dec. 31, 2023
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Investments, Debt and Equity Securities [Abstract] |  |
Allowance for credit losses | $ 0 | $ 0

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- Definition The credit loss allowance on debt securities. The credit loss allowance represents the decline in fair value below cost due to credit related factors. + References No definition available. + Details
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Namespace Prefix: | cflt_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- References No definition available. + Details
Name: | us-gaap_InvestmentsDebtAndEquitySecuritiesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration