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DEBT - Trust Preferred Securities (Details) $ in Millions | Sep. 30, 2025 USD ($) shares
--- | ---
Trust Preferred Securities |
Liquidation value | $ 2,440
Notional amount | $ 2,446
Citigroup Capital III |
Trust Preferred Securities |
Securities issued (in shares) | shares | 194,053
Liquidation value | $ 194
Coupon rate | 7.625%
Common shares issued to parent (in shares) | shares | 6,003
Notional amount | $ 200
Citigroup Capital XIII |
Trust Preferred Securities |
Securities issued (in shares) | shares | 89,840,000
Liquidation value | $ 2,246
Common shares issued to parent (in shares) | shares | 1,000
Notional amount | $ 2,246
Citigroup Capital XIII | SOFR |
Trust Preferred Securities |
Basis spread on variable rate | 0.0663161
Citigroup Capital XIII | LIBOR |
Trust Preferred Securities |
Basis spread on variable rate | 0.0026161

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- Definition This element represents the proceeds received from the trust at the date of issuance of the junior subordinated debentures to the trust. + References No definition available. + Details
Name: | c_JuniorSubordinatedDebenturesOwnedByTrustProceedsReceivedFromTrustAtIssuance
Namespace Prefix: | c_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition This element represents the common shares issued by subsidiary trust to parent. + References No definition available. + Details
Name: | c_SubsidiaryTrustCommonSharesIssuedToParent
Namespace Prefix: | c_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

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- Definition Trust Preferred Securities, Basis Spread On Variable Rate + References No definition available. + Details
Name: | c_TrustPreferredSecuritiesBasisSpreadOnVariableRate
Namespace Prefix: | c_
Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | instant

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- Definition This element represents the coupon rate of the trust preferred securities. + References No definition available. + Details
Name: | c_TrustPreferredSecuritiesCouponRate
Namespace Prefix: | c_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition This element represents the number of trust preferred securities issued as of the balance sheet date. + References No definition available. + Details
Name: | c_TrustPreferredSecuritiesIssued
Namespace Prefix: | c_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition This element represents the notional value received by investors from the trusts at the time of issuance. + References No definition available. + Details
Name: | c_TrustPreferredSecuritiesLiquidationValue
Namespace Prefix: | c_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 480 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481648/480-10-50-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 480 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481648/480-10-50-4 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_VariableRateAxis=us-gaap_SecuredOvernightFinancingRateSofrMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
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