2.4.0.82411403 - Disclosure - Commitments and Contingencies (Details Textual)truefalsefalse1false USDfalsefalseD2012Q4YTDhttp://www.sec.gov/CIK0000045947duration2012-01-01T00:00:002012-12-31T00:00:00numberStandardhttp://www.xbrl.org/2003/instancepurexbrli0CounterpartyStandardhttp://www.thehartford.com/20130913Integerhig0usdStandardhttp://www.xbrl.org/2003/iso4217USDiso42170$2false USDfalsefalse$D2011Q4YTDhttp://www.sec.gov/CIK0000045947duration2011-01-01T00:00:002011-12-31T00:00:00usdStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$1true 3us-gaap_GuaranteeObligationsLineItemsus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Guarantor Obligations [Line Items]2false 4hig_UnfundedCommitmentshig_falsecreditinstantfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse299000000299000000USD$falsetruefalse2falsefalsefalse00falsefalsefalsexbrli:monetaryItemTypemonetaryUnfunded commitments.No definition available.false2Total unfunded commitments3false 4hig_CommitmentsToFundLimitedPartnershipAndOtherAlternativeInvestmentshig_falsecreditinstantfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse269000000269000000USD$falsefalsefalse2falsefalsefalse00falsefalsefalsexbrli:monetaryItemTypemonetaryCommitments to fund limited partnership and other alternative investments.No definition available.false2Commitments to fund limited partnership and other alternative investments4false 4hig_CommitmentsToFundMortgageLoanshig_falsecreditinstantfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse2700000027000000USD$falsefalsefalse2falsefalsefalse00falsefalsefalsexbrli:monetaryItemTypemonetaryCommitments to fund mortgage loans.No definition available.false2Commitments to fund mortgage loans5false 4us-gaap_DerivativeNetLiabilityPositionAggregateFairValueus-gaap_truecreditinstantfalsefalsefalsefalsefalsefalsefalsefalseverboseLabel1truefalsefalse365000000365000000USD$falsefalsefalse2falsefalsefalse00falsefalsefalsexbrli:monetaryItemTypemonetaryThe aggregate fair value amounts of derivative instruments that contain credit-risk-related contingent features that are in a net liability position at the end of the reporting period. 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