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GOODWILL AND INTANGIBLE ASSETS - Components of Intangible Assets (Details) - USD ($) $ in Millions | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Finite and Indefinite-lived Intangible Assets |  |
Gross carrying amount of Intangible assets (excluding MSRs) | $ 10,485 | $ 10,454
Accumulated amortization of Intangible assets (excluding MSRs) | 6,903 | 6,720
Net carrying amount of Intangible assets (excluding MSRs) | 3,582 | 3,734
Gross carrying amount, Mortgage servicing rights (MSRs) | 748 | 760
Mortgage servicing rights (MSRs) | 748 | 760
Gross carrying amount of Intangible assets | 11,233 | 11,214
Accumulated amortization of Intangible assets | 6,903 | 6,720
Total intangible assets | 4,330 | 4,494
Indefinite-lived intangible assets |  |
Finite and Indefinite-lived Intangible Assets |  |
Gross carrying amount of Intangible assets (excluding MSRs) | 223 | 197
Net carrying amount of Intangible assets (excluding MSRs) | 223 | 197
Purchased credit card relationships |  |
Finite and Indefinite-lived Intangible Assets |  |
Gross carrying amount of Intangible assets (excluding MSRs) | 5,315 | 5,315
Accumulated amortization of Intangible assets (excluding MSRs) | 4,606 | 4,507
Net carrying amount of Intangible assets (excluding MSRs) | 709 | 808
Credit card contract related intangibles |  |
Finite and Indefinite-lived Intangible Assets |  |
Gross carrying amount of Intangible assets (excluding MSRs) | 4,578 | 4,586
Accumulated amortization of Intangible assets (excluding MSRs) | 1,964 | 1,905
Net carrying amount of Intangible assets (excluding MSRs) | 2,614 | 2,681
Other customer relationships |  |
Finite and Indefinite-lived Intangible Assets |  |
Gross carrying amount of Intangible assets (excluding MSRs) | 334 | 325
Accumulated amortization of Intangible assets (excluding MSRs) | 299 | 278
Net carrying amount of Intangible assets (excluding MSRs) | 35 | 47
Present value of future profits |  |
Finite and Indefinite-lived Intangible Assets |  |
Gross carrying amount of Intangible assets (excluding MSRs) | 35 | 31
Accumulated amortization of Intangible assets (excluding MSRs) | 34 | 30
Net carrying amount of Intangible assets (excluding MSRs) | $ 1 | $ 1

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

X
- Definition Sum of the carrying amounts of all intangible assets, excluding goodwill and excluding mortgage servicing rights, as of the balance sheet date, net of accumulated amortization and impairment charges. + References No definition available. + Details
Name: | c_IntangibleAssetsExcludingMortgageServicingRights
Namespace Prefix: | c_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition This element represents the accumulated amortization of all intangible assets, excluding goodwill and mortgage servicing rights (MSRs), as of the balance sheet date. + References No definition available. + Details
Name: | c_IntangibleAssetsExcludingMortgageServicingRightsAccumulatedAmortization
Namespace Prefix: | c_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition This element represents the gross carrying amounts of all intangible assets, excluding goodwill and mortgage servicing rights (MSRs), as of the balance sheet date. + References No definition available. + Details
Name: | c_IntangibleAssetsExcludingMortgageServicingRightsGrossCarryingAmount
Namespace Prefix: | c_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition This element represents the sum of the carrying amounts of all intangible assets excluding goodwill but including mortgage servicing rights, as of the balance sheet date that is net of accumulated amortization and impairment charges. + References No definition available. + Details
Name: | c_IntangibleAssetsIncludingMortgageServicingRights
Namespace Prefix: | c_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition This element represents the accumulated amortization of all intangible assets excluding goodwill but including mortgage servicing rights (MSRs), as of the balance sheet date. + References No definition available. + Details
Name: | c_IntangibleAssetsIncludingMortgageServicingRightsAccumulatedAmortization
Namespace Prefix: | c_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition This element represents the gross carrying amount of intangible assets excluding goodwill but including mortgage servicing rights (MSRs), as of the balance sheet date. + References No definition available. + Details
Name: | c_IntangibleAssetsIncludingMortgageServicingRightsGrossCarryingAmount
Namespace Prefix: | c_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The amount of mortgage servicing rights (MSRs) as of the balance sheet date. + References No definition available. + Details
Name: | c_MortgageServicingRightsMSR
Namespace Prefix: | c_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition This element represents the gross carrying amount of mortgage servicing rights (MSRs) as of the balance sheet date. + References No definition available. + Details
Name: | c_MortgageServicingRightsMSRGrossCarryingAmount
Namespace Prefix: | c_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis=us-gaap_IndefinitelivedIntangibleAssetsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis=c_PurchasedCreditCardRelationshipsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis=us-gaap_ContractBasedIntangibleAssetsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis=c_OtherCustomerRelationshipsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis=c_PresentValueOfFutureProfitsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |