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This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27161-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 13, 19 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. false2Gross Unrealized Gains74false 5us-gaap_AvailableForSaleSecuritiesGrossUnrealizedLosses1us-gaap_truecreditinstantfalsefalsefalsefalsefalsefalsefalsetruenegatedLabel1truefalsefalse-36000000-36USD$falsefalsefalse2truefalsefalse-66000000-66USD$falsefalsefalsexbrli:monetaryItemTypemonetaryThis item represents the gross unrealized losses for securities, at a point in time, which are categorized neither as held-to-maturity nor trading securities.No definition available.false2Gross Unrealized Losses75false 5hig_AvailableForSaleSecuritiesFairValuehig_falsedebitinstantfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse400000000400USD$falsefalsefalse2truefalsefalse398000000398USD$falsefalsefalsexbrli:monetaryItemTypemonetaryAvailable-for-sale securities, fair value.No definition available.false2Fair Value76false 5hig_AvailableForSaleSecuritiesNonCreditOttihig_falsedebitinstantfalsefalsefalsefalsefalsefalsefalsefalseverboseLabel1truefalsefalse00[2]USD$falsetruefalse2truefalsefalse00[2]USD$falsetruefalsexbrli:monetaryItemTypemonetaryAvailable-for-sale securities non-credit OTTI.No definition available.false2Non-Credit OTTI1Includes fixed maturities, AFS and equity securities, AFS relating to the sales of the Retirement Plans and Individual Life businesses; see Note 2 - Business Dispositions of Notes to Consolidated Financial Statements for further discussion of this transaction.2Represents the amount of cumulative non-credit OTTI losses recognized in OCI on securities that also had credit impairments. These losses are included in gross unrealized losses as of December 31, 2012 and 2011.3Gross unrealized gains (losses) exclude the fair value of bifurcated embedded derivative features of certain securities. Subsequent changes in value will be recorded in net realized capital gains (losses).falseInvestments and Derivative Instruments (Available-for-Sale Securities) (Details) (USD $)MillionsUnKnownUnKnownUnKnowntruefalsefalseSheethttp://www.thehartford.com/role/InvestmentsAndDerivativeInstrumentsAvailableForSaleSecuritiesDetails276