SECURITIZATIONS AND VARIABLE INTEREST ENTITIES - Credit Card Securitizations Narrative (Details)	9 Months Ended
Sep. 30, 2024 trust
Securitizations and Variable Interest Entities [Abstract]
Number of trusts to hold securitized credit card receivables	2

Represents the number of securitization trusts established to hold in trust a specific type of securitized receivables.

No definition available.

Name:	c_SecuritizationTrustNumber
Namespace Prefix:	c_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration