Derivatives and embedded derivatives - Schedule of derivative instruments in statement of financial position, fair value (Parenthetical) (Detail) $ in Millions	Dec. 31, 2023 USD ($)
Derivative Instrument Detail [Abstract]
Embedded derivatives in fair value hedging	$ 1.4

Embedded hedging derivatives obligation to return collateral.

No definition available.

Name:	crcl_EmbeddedHedgingDerivativesObligationToReturnCollateral
Namespace Prefix:	crcl_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant