Name:	c_AssetsPledgedAsCollateralAtCarryingValue
Namespace Prefix:	c_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- References

No definition available.

Name:	c_AssetsPledgedAsCollateralAtCarryingValueAbstract
Namespace Prefix:	c_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

Financial Instruments Pledged as Collateral, Amount Not Eligible to be Repledged by Counterparty

No definition available.

Name:	c_FinancialInstrumentsPledgedAsCollateralAmountNotEligibleToBeRepledgedByCounterparty
Namespace Prefix:	c_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Represents the carrying value, as of the date of each statement of financial position presented, of investment securities which are owned but pledged.

No definition available.

Name:	c_InvestmentSecuritiesPledgedAsCollateralAtCarryingValue
Namespace Prefix:	c_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Represents the carrying value, as of the date of each statement of financial position presented, of loans which are owned but pledged.

No definition available.

Name:	c_LoansPledgedAsCollateralAtCarryingValue
Namespace Prefix:	c_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Represents the carrying value, as of the date of each statement of financial position presented, of trading account assets which are owned but pledged.

No definition available.

Name:	c_TradingAccountAssetsPledgedAsCollateralAtCarryingValue
Namespace Prefix:	c_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Fair value of collateral permitted, by contact or custom, to be sold or re-pledged.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 860
-SubTopic 30
-Section 50
-Paragraph 1A
-Subparagraph (c)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481420/860-30-50-1A