Name:	c_PercentageOfReductionApplicableInCaseOfPretaxLoss
Namespace Prefix:	c_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

Represents the period for calculation of performance goals based on return on assets and relative total shareholder return against peers.

No definition available.

Name:	c_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionPeriodUsedForCalculationOfPerformanceGoals
Namespace Prefix:	c_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

Represents the number of shares of common stock value of which is equivalent to value of each target share.

No definition available.

Name:	c_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesOfCommonStockEquivalentToEachTargetShare
Namespace Prefix:	c_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

Represents the percentage of target shares, an employee can earn, under the plan..

No definition available.

Name:	c_ShareBasedCompensationArrangementByShareBasedPaymentAwardPercentageOfTargetSharesEarned
Namespace Prefix:	c_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(2)(iii)(1)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph A240

-Subparagraph b(2)(c)

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.