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SECURITIZATIONS AND VARIABLE INTEREST ENTITIES - Funding, Liquidity Facilities and Subordinated Interests (Details) - USD ($) $ in Billions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Mar. 31, 2025 | Sep. 30, 2025 | Dec. 31, 2024
Citibank Credit Card Master Trust (Master Trust) |  |  |
Funding, Liquidity Facilities and Subordinated Interests |  |  |
Weighted average maturity of term notes | 3 years 7 months 6 days | 3 years 3 months 18 days |
Term notes issued to third parties |  | $ 6.0 | $ 4.3
Term notes retained by Citigroup affiliates |  | 1.9 | 1.7
Total Trust liabilities |  | $ 7.9 | 6.0
Citibank OMNI Master Trust (Omni Trust) |  |  |
Funding, Liquidity Facilities and Subordinated Interests |  |  |
Weighted average maturity of term notes | 1 year 4 months 24 days | 7 months 6 days |
Term notes issued to third parties |  | $ 0.9 | 0.9
Term notes retained by Citigroup affiliates |  | 1.5 | 2.0
Total Trust liabilities |  | $ 2.4 | $ 2.9

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

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- Definition The par value of liabilities of the credit card receivables securitization trust. + References No definition available. + Details
Name: | c_LiabilitiesHeldInTrust
Namespace Prefix: | c_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The par value of liabilities of the credit card receivables securitization trust related to term notes issued to third parties. + References No definition available. + Details
Name: | c_TermNotesIssuedToThirdParties
Namespace Prefix: | c_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The par value of liabilities of the credit card receivables securitization trust related to term notes retained by affiliates of the entity. + References No definition available. + Details
Name: | c_TermNotesRetainedByAffiliates
Namespace Prefix: | c_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition This element represents the weighted average maturity of the term notes. + References No definition available. + Details
Name: | c_WeightedAverageMaturityOfTermNotes
Namespace Prefix: | c_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_DebtInstrumentAxis=c_CitibankCreditCardMasterTrustMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=c_CitibankOMNIMasterTrustMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |