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GUARANTEES AND COMMITMENTS - Guarantees (Details) - USD ($) $ in Millions | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Maximum potential amount of future payments |  |
Expire within 1 year | $ 430,000 | $ 395,900
Expire after 1 year | 133,700 | 127,500
Total amount outstanding | 563,700 | 523,400
Carrying value | 1,077 | 964
Cash collateral available to reimburse losses realized under guarantees and indemnifications | 54,600 | 49,000
Securities and other marketable assets held as collateral | 88,700 | 62,500
Letters of credit in favor of the Company held as collateral | 3,000 | 3,100
Financial standby letters of credit |  |
Maximum potential amount of future payments |  |
Expire within 1 year | 14,300 | 15,500
Expire after 1 year | 66,300 | 63,500
Total amount outstanding | 80,600 | 79,000
Carrying value | 535 | 546
Performance guarantees |  |
Maximum potential amount of future payments |  |
Expire within 1 year | 4,800 | 4,200
Expire after 1 year | 5,800 | 5,800
Total amount outstanding | 10,600 | 10,000
Carrying value | 21 | 27
Derivative instruments considered to be guarantees |  |
Maximum potential amount of future payments |  |
Expire within 1 year | 23,100 | 15,800
Expire after 1 year | 32,400 | 27,300
Total amount outstanding | 55,500 | 43,100
Carrying value | 440 | 332
Loans sold with recourse |  |
Maximum potential amount of future payments |  |
Expire within 1 year | 0 | 0
Expire after 1 year | 900 | 1,000
Total amount outstanding | 900 | 1,000
Carrying value | 0 | 0
Repurchase reserve for consumer mortgages representations and warranties | 14 | 12
Securities lending indemnifications |  |
Maximum potential amount of future payments |  |
Expire within 1 year | 125,500 | 96,300
Expire after 1 year | 0 | 0
Total amount outstanding | 125,500 | 96,300
Carrying value | 0 | 0
Credit card merchant processing |  |
Maximum potential amount of future payments |  |
Expire within 1 year | 34,400 | 124,300
Expire after 1 year | 0 | 0
Total amount outstanding | 34,400 | 124,300
Carrying value | 0 | 0
Credit card arrangements with partners |  |
Maximum potential amount of future payments |  |
Expire within 1 year | 1,600 | 200
Expire after 1 year | 19,900 | 21,500
Total amount outstanding | 21,500 | 21,700
Carrying value | 1 | 2
Guarantees under the Fixed Income Clearing Corporation sponsored member repo program |  |
Maximum potential amount of future payments |  |
Expire within 1 year | 226,300 | 139,500
Expire after 1 year | 0 | 0
Total amount outstanding | 226,300 | 139,500
Carrying value | 0 | 0
Other |  |
Maximum potential amount of future payments |  |
Expire within 1 year | 0 | 100
Expire after 1 year | 8,400 | 8,400
Total amount outstanding | 8,400 | 8,500
Carrying value | $ 80 | $ 57

X
- Definition Cash held as collateral available to the reporting entity to reimburse losses realized under guarantees and indemnifications. + References No definition available. + Details
Name: | c_CashHeldAsCollateral
Namespace Prefix: | c_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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

X
- Definition Represents the maximum potential payments with respect to the entity's guarantees that expire after one year. + References No definition available. + Details
Name: | c_GuaranteeObligationsMaximumExposureExpireAfterOneYear
Namespace Prefix: | c_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Represents the maximum potential payments with respect to the entity's guarantees that expire within one year. + References No definition available. + Details
Name: | c_GuaranteeObligationsMaximumExposureExpireWithinOneYear
Namespace Prefix: | c_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Represents the letters of credit in favor of the entity held as collateral to reimburse losses realized under the guarantees. + References No definition available. + Details
Name: | c_LettersOfCreditReceivedAsCollateral
Namespace Prefix: | c_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition This element represents the repurchase reserve created for consumer mortgages, representations and warranties. + References No definition available. + Details
Name: | c_RepurchaseReserveConsumerMortgagesRepresentationsAndWarranties
Namespace Prefix: | c_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Securities and Other Marketable Assets Held as Collateral + References No definition available. + Details
Name: | c_SecuritiesandOtherMarketableAssetsHeldasCollateral
Namespace Prefix: | c_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The current carrying amount of the liability for the freestanding or embedded guarantor's obligations under the guarantee or each group of similar guarantees. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 460 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482425/460-10-50-4 + Details
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Balance Type: | credit
Period Type: | instant

X
- Definition Maximum potential amount of future payments (undiscounted) the guarantor could be required to make under the guarantee or each group of similar guarantees before reduction for potential recoveries under recourse or collateralization provisions. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 460 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (b)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482425/460-10-50-4 + Details
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Namespace Prefix: | us-gaap_
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Period Type: | instant

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- Details
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Namespace Prefix: |
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- Details
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- Details
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- Details
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Namespace Prefix: |
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- Details
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Namespace Prefix: |
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- Details
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- Details
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Namespace Prefix: |
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- Details
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- Details
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