Represents amount of assets held by consolidated investment entities.

No definition available.

Name:	c_AssetsHeldByConsolidatedInvestmentEntities
Namespace Prefix:	c_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	instant

- Definition

Represents percentage of The Significant Plans over the company's global pension and postretirement liabilities, which utilize a quarterly measurement policy.

+ References

No definition available.

+ Details

Name:	c_DefinedBenefitPlanSignificantPlansPercentageCapturedOverTotalPensionAndPostretirementLiabilitiesUtilizingQuarterlyMeasurement
Namespace Prefix:	c_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

The total amount of net periodic benefit cost for defined benefit plans for the period. Periodic benefit costs include the following components: service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) due to settlements or curtailments.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (h)

-URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920

+ Details

Name:	us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Details

Name:	us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount before tax, after reclassification adjustments of other comprehensive income (loss).

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 220

-SubTopic 10

-Section 45

-Paragraph 1A

-URI http://asc.fasb.org/extlink&oid=28358780&loc=SL7669619-108580

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 220

-SubTopic 10

-Section 45

-Paragraph 1B

-URI http://asc.fasb.org/extlink&oid=28358780&loc=SL7669625-108580

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 323

-SubTopic 10

-Section 45

-Paragraph 3

-URI http://asc.fasb.org/extlink&oid=16385135&loc=d3e33775-111570

+ Details

Name:	us-gaap_OtherComprehensiveIncomeLossBeforeTax
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

BASIS OF PRESENTATION (Details 2) (USD $)		3 Months Ended			0 Months Ended
BASIS OF PRESENTATION (Details 2) (USD $)	Mar. 31, 2014 ASU No. 2013-08	Jun. 30, 2013 Effect of change in the measurement policy from annually to quarterly	Dec. 31, 2013 Effect of change in the measurement policy from annually to quarterly	Dec. 31, 2012 Effect of change in the measurement policy from annually to quarterly	Apr. 02, 2013 Effect of change in the measurement policy from annually to quarterly Pension liability adjustments
New Accounting Pronouncements or Change in Accounting Principle
Assets held by consolidated investment companies	$ 4,400,000,000
Percentage of The Significant Plans over global pension and postretirement liabilities, which utilize quarterly measurement policy		80.00%	80.00%	80.00%
Pretax decrease in net periodic plan expense		20,000,000
Pretax increase of approximately to accumulated other comprehensive income					$ (22,000,000)