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4hig_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputAbstracthig_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalseverboseLabel1falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Fair Value Assets Measured On Recurring Basis Unobservable Input [Abstract]185false 5hig_FairValueInputsEquityVolatilityhig_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truetruefalse0.240.24falsefalsefalsenum:percentItemTypepureFair Value Inputs Equity Volatility.No definition available.false0Fair Value Inputs Equity Volatility1Conversely, the impact of a decrease in input would have the opposite impact to the fair value as that presented in the table. Changes are based on long positions, unless otherwise noted. Changes in fair value will be inversely impacted for short positions.2Conversely, the impact of a decrease in input would have the opposite impact to the fair value as that presented in the table above.3Level 3 corporate securities excludes those for which the Company bases fair value on broker quotations as discussed below.4Decrease for above market rate coupons and increase for below market rate coupons.5The weighted average is determined based on the fair value of the securitiesfalseFair Value Measurements (Assets Measured at Fair Values) (Details) (Income approach Valuation Technique [Member], Level 3 [Member], USD $)MillionsUnKnownUnKnownUnKnowntruefalsefalseSheethttp://www.thehartford.com/role/FairValueMeasurementsAssetsMeasuredAtFairValuesDetails1185