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

- Details

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

This element represents the fair value of assets pledged as collateral that are covered under federal and other brokerage regulations.

No definition available.

Name:	c_CashAndSecuritiesSegregatedUnderSecuritiesExchangeCommissionAndOtherRegulationFairValueDisclosure
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://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 860

-SubTopic 30

-Section 50

-Paragraph 1A

-Subparagraph (c)(1)

-URI http://asc.fasb.org/extlink&oid=34720971&loc=SL6224234-111729

Name:	us-gaap_FairValueOfSecuritiesReceivedAsCollateralThatCanBeResoldOrRepledged
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Fair value of financial instrument held by the entity for its own account (proprietary securities) for trading or investment purposes that are carried at fair value and pledged to counterparties as collateral for financing transactions where counterparty does not have the right to re-pledge such.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 860

-SubTopic 30

-Section 50

-Paragraph 1A

-Subparagraph (b)(1)(i)

-URI http://asc.fasb.org/extlink&oid=34720971&loc=SL6224234-111729