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INVESTMENTS - Mortgage-backed Securities (Details) (Mortgage-backed securities)
 12 Months Ended
Dec. 31, 2014
Current loans
  
Key assumptions for mortgage-backed securities  
Default rate projection (as a percent) 10.00%us-gaap_FairValueInputsProbabilityOfDefault
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PerformingFinancingReceivableMember
/ invest_InvestmentAxis
= us-gaap_MortgageBackedSecuritiesMember
30-59 day deliquent loans
  
Key assumptions for mortgage-backed securities  
Default rate projection (as a percent) 25.00%us-gaap_FairValueInputsProbabilityOfDefault
/ us-gaap_InternalCreditAssessmentAxis
= c_DelinquentLoans30to59DaysMember
/ invest_InvestmentAxis
= us-gaap_MortgageBackedSecuritiesMember
60-90 day deliquent loans
  
Key assumptions for mortgage-backed securities  
Default rate projection (as a percent) 70.00%us-gaap_FairValueInputsProbabilityOfDefault
/ us-gaap_InternalCreditAssessmentAxis
= c_DelinquentLoans60to90DaysMember
/ invest_InvestmentAxis
= us-gaap_MortgageBackedSecuritiesMember
91+ day deliquent loans
  
Key assumptions for mortgage-backed securities  
Default rate projection (as a percent) 100.00%us-gaap_FairValueInputsProbabilityOfDefault
/ us-gaap_InternalCreditAssessmentAxis
= c_DelinquentLoansMorethan91DaysMember
/ invest_InvestmentAxis
= us-gaap_MortgageBackedSecuritiesMember