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LOANS (Details 10) (USD $) In Millions	Sep. 30, 2011
Financing receivable allowance for credit losses
Beginning balance	$ 467
Balance, December 31, 2010	$ 467

X

- Details

Name:	c_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAllowanceForLoanLossesRollForward
Namespace Prefix:	c
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

A valuation allowance for financing receivables that are expected to be uncollectible.

+ Details

Name:	c_FinancingReceivableAllowanceForCreditLosses
Namespace Prefix:	c
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant