XML 181 R88.htm IDEA: XBRL DOCUMENT v2.4.1.9
RETIREMENT BENEFITS - Mortality Table (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]  
Percent increase to reflect Citigroup mortality experience rate 4.00%c_DefinedBenefitPlanMortalityExperienceRateAdjustment
Expected increase in benefit expense, next fiscal year $ 73c_DefinedBenefitPlansBenefitExpenseEstimatedIncreaseDuetoMortalityRateAdjustmentinNextFiscalYear
U.S. Pension Plans  
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]  
PBO increase due to mortality rate adjustment 1,209c_DefinedBenefitPlanBenefitObligationIncreaseDecreaseDuetoMortalityRateAdjustment
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_UnitedStatesPensionPlansOfUSEntityDefinedBenefitMember
Increase of PBO due to mortality rate adjustment 1,209c_DefinedBenefitPlanFundedStatusofPlanandAccumulatedOtherComprehensiveIncomeLossDecreaseDuetoMortalityRateAdjustment
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_UnitedStatesPensionPlansOfUSEntityDefinedBenefitMember
Decrease in funded status and AOCI due to mortality rate adjustment $ 737c_DefinedBenefitPlanFundedStatusofPlanandAccumulatedOtherComprehensiveIncomeLossDecreaseDuetoMortalityRateAdjustmentNet
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_UnitedStatesPensionPlansOfUSEntityDefinedBenefitMember