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amount of the right to reclaim cash collateral under master netting arrangements that have not been offset against net derivative instrument positions.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=7476318&loc=d3e41678-113959 false2Amount of unrestricted cash collateral to counterparties in the normal course of business4false 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estimated value of gains (losses), net anticipated to be transferred in the next twelve months from accumulated other comprehensive income into earnings.No definition available.false2Net derivative gains estimated to be reclassified from accumulated other comprehensive income (loss) into net income within the next twelve months5true 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financial instruments6false 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notional amount specified by the derivative(s). Expressed as an absolute value.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B false2Notional amount7false 4us-gaap_DerivativeFairValueOfDerivativeNetus-gaap_truedebitinstantfalsefalsefalsefalsefalsefalsefalsefalsetotalLabel1truefalsefalse-80382000-80382falsefalsefalse2falsefalsefalse00falsefalsefalse3truefalsefalse-80382000-80382falsefalsefalse4falsefalsefalse00falsefalsefalse5truefalsefalse-55740000-55740falsefalsefalse6falsefalsefalse00falsefalsefalse7falsefalsefalse00falsefalsefalse8falsefalsefalse00falsefalsefalse9falsefalsefalse00falsefalsefalse10falsefalsefalse00falsefalsefalse11falsefalsefalse00falsefalsefalse12falsefalsefalse00falsefalsefalse13falsefalsefalse00falsefalsefalse14falsefalsefalse00falsefalsefalse15truefalsefalse-80221000-80221falsefalsefalse16truefalsefalse-56387000-56387falsefalsefalse17truefalsefalse-85910000-85910falsefalsefalse18truefalsefalse-54996000-54996falsefalsefalse19truefalsefalse1767100017671falsefalsefalse20truefalsefalse2611300026113falsefalsefalse21truefalsefalse-103581000-103581falsefalsefalse22truefalsefalse-81109000-81109falsefalsefalse23truefalsefalse56890005689falsefalsefalse24truefalsefalse-1391000-1391falsefalsefalse25truefalsefalse56890005689falsefalsefalse26truefalsefalse-1391000-1391falsefalsefalse27truefalsefalse-161000-161falsefalsefalse28truefalsefalse647000647falsefalsefalse29truefalsefalse-1010000-1010falsefalsefalse30truefalsefalse305000305falsefalsefalse31falsefalsefalse00falsefalsefalse32falsefalsefalse00falsefalsefalse33falsefalsefalse00falsefalsefalse34falsefalsefalse00falsefalsefalse35truefalsefalse849000849falsefalsefalse36truefalsefalse342000342falsefalsefalsexbrli:monetaryItemTypemonetaryFair value of the assets less the liabilities of a derivative or group of derivatives.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=7491637&loc=d3e13433-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=7491637&loc=d3e13495-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958 true2Net derivatives, Fair value8false 4us-gaap_DerivativeFairValueOfDerivativeAssetus-gaap_truedebitinstantfalsefalsefalsefalsefalsefalsefalsefalseverboseLabel1truefalsefalse3269000032690falsefalsefalse2falsefalsefalse00falsefalsefalse3truefalsefalse3269000032690falsefalsefalse4falsefalsefalse00falsefalsefalse5truefalsefalse2664700026647falsefalsefalse6falsefalsefalse00falsefalsefalse7falsefalsefalse00falsefalsefalse8falsefalsefalse00falsefalsefalse9falsefalsefalse00falsefalsefalse10falsefalsefalse00falsefalsefalse11falsefalsefalse00falsefalsefalse12falsefalsefalse00falsefalsefalse13falsefalsefalse00falsefalsefalse14falsefalsefalse00falsefalsefalse15truefalsefalse2951100029511falsefalsefalse16truefalsefalse3101400031014falsefalsefalse17truefalsefalse2368100023681falsefalsefalse18truefalsefalse3075600030756falsefalsefalse19truefalsefalse1767100017671falsefalsefalse20truefalsefalse2611300026113falsefalsefalse21truefalsefalse60100006010falsefalsefalse22truefalsefalse46430004643falsefalsefalse23truefalsefalse58300005830falsefalsefalse24truefalsefalse258000258falsefalsefalse25truefalsefalse58300005830falsefalsefalse26truefalsefalse258000258falsefalsefalse27truefalsefalse15980001598falsefalsefalse28truefalsefalse14040001404falsefalsefalse29truefalsefalse749000749falsefalsefalse30truefalsefalse10620001062falsefalsefalse31falsefalsefalse00falsefalsefalse32falsefalsefalse00falsefalsefalse33falsefalsefalse00falsefalsefalse34falsefalsefalse00falsefalsefalse35truefalsefalse849000849falsefalsefalse36truefalsefalse342000342falsefalsefalsexbrli:monetaryItemTypemonetaryFair value of derivative asset, presented on a gross basis even when the derivative instrument is subject to master netting arrangements and qualifies for net presentation in the statement of financial position.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 205G -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. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 44C -Subparagraph a -Clause 1 -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. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (a),(c) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624163-113959 false2Asset derivatives, Fair value9false 4us-gaap_DerivativeFairValueOfDerivativeLiabilityus-gaap_truecreditinstantfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse113564000113564falsefalsefalse2falsefalsefalse00falsefalsefalse3truefalsefalse113564000113564falsefalsefalse4falsefalsefalse00falsefalsefalse5truefalsefalse8709300087093falsefalsefalse6falsefalsefalse00falsefalsefalse7falsefalsefalse00falsefalsefalse8falsefalsefalse00falsefalsefalse9falsefalsefalse00falsefalsefalse10falsefalsefalse00falsefalsefalse11falsefalsefalse00falsefalsefalse12falsefalsefalse00falsefalsefalse13falsefalsefalse00falsefalsefalse14falsefalsefalse00falsefalsefalse15truefalsefalse109732000109732falsefalsefalse16truefalsefalse8740100087401falsefalsefalse17truefalsefalse109591000109591falsefalsefalse18truefalsefalse8575200085752falsefalsefalse19falsefalsefalse00falsefalsefalse20falsefalsefalse00falsefalsefalse21truefalsefalse109591000109591falsefalsefalse22truefalsefalse8575200085752falsefalsefalse23truefalsefalse141000141falsefalsefalse24truefalsefalse16490001649falsefalsefalse25truefalsefalse141000141falsefalsefalse26truefalsefalse16490001649falsefalsefalse27truefalsefalse17590001759falsefalsefalse28truefalsefalse757000757falsefalsefalse29truefalsefalse17590001759falsefalsefalse30truefalsefalse757000757falsefalsefalse31falsefalsefalse00falsefalsefalse32falsefalsefalse00falsefalsefalse33falsefalsefalse00falsefalsefalse34falsefalsefalse00falsefalsefalse35falsefalsefalse00falsefalsefalse36falsefalsefalse00falsefalsefalsexbrli:monetaryItemTypemonetaryFair value of derivative liability, presented on a gross basis even when the derivative instrument is subject to master netting arrangements and qualifies for net presentation in the statement of financial position.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 205G -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. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 44C -Subparagraph a -Clause 1 -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. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (a),(c) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624163-113959 false2Liability derivatives, Fair value10false 4gac_DerivativeNumberOfTransactionsgac_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalse5falsefalsefalse00falsefalsefalse6truefalsefalse379379falsefalsefalse7truefalsefalse931931falsefalsefalse8truefalsefalse2626falsefalsefalse9truefalsefalse4646falsefalsefalse10truefalsefalse3232falsefalsefalse11truefalsefalse7575falsefalsefalse12truefalsefalse1515falsefalsefalse13truefalsefalse2323falsefalsefalse14falsefalsefalse00falsefalsefalse15falsefalsefalse00falsefalsefalse16falsefalsefalse00falsefalsefalse17falsefalsefalse00falsefalsefalse18falsefalsefalse00falsefalsefalse19falsefalsefalse00falsefalsefalse20falsefalsefalse00falsefalsefalse21falsefalsefalse00falsefalsefalse22falsefalsefalse00falsefalsefalse23falsefalsefalse00falsefalsefalse24falsefalsefalse00falsefalsefalse25falsefalsefalse00falsefalsefalse26falsefalsefalse00falsefalsefalse27falsefalsefalse00falsefalsefalse28falsefalsefalse00falsefalsefalse29falsefalsefalse00falsefalsefalse30falsefalsefalse00falsefalsefalse31falsefalsefalse00falsefalsefalse32falsefalsefalse00falsefalsefalse33falsefalsefalse00falsefalsefalse34falsefalsefalse00falsefalsefalse35falsefalsefalse00falsefalsefalse36falsefalsefalse00falsefalsefalsexbrli:integerItemTypeintegerThe number of derivative transactions entered into by the entity during the reporting period.No definition available.false256Number of derivative transactions11false 4gac_DerivativeAverageNotionalAmountgac_falsedebitdurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalse5falsefalsefalse00falsefalsefalse6falsefalsefalse00falsefalsefalse7falsefalsefalse00falsefalsefalse8truefalsefalse51230005123falsefalsefalse9truefalsefalse55280005528falsefalsefalse10truefalsefalse28210002821falsefalsefalse11truefalsefalse86850008685falsefalsefalse12truefalsefalse1160100011601falsefalsefalse13truefalsefalse1271000012710falsefalsefalse14falsefalsefalse00falsefalsefalse15falsefalsefalse00falsefalsefalse16falsefalsefalse00falsefalsefalse17falsefalsefalse00falsefalsefalse18falsefalsefalse00falsefalsefalse19falsefalsefalse00falsefalsefalse20falsefalsefalse00falsefalsefalse21falsefalsefalse00falsefalsefalse22falsefalsefalse00falsefalsefalse23falsefalsefalse00falsefalsefalse24falsefalsefalse00falsefalsefalse25falsefalsefalse00falsefalsefalse26falsefalsefalse00falsefalsefalse27falsefalsefalse00falsefalsefalse28falsefalsefalse00falsefalsefalse29falsefalsefalse00falsefalsefalse30falsefalsefalse00falsefalsefalse31falsefalsefalse00falsefalsefalse32falsefalsefalse00falsefalsefalse33falsefalsefalse00falsefalsefalse34falsefalsefalse00falsefalsefalse35falsefalsefalse00falsefalsefalse36falsefalsefalse00falsefalsefalsexbrli:monetaryItemTypemonetaryAverage notional amount specified by the derivative(s). Expressed as an absolute value.No definition available.false2Average notional amount of derivative instruments12false 4gac_AverageNumberOfContractsPerTransactiongac_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalse5falsefalsefalse00falsefalsefalse6truefalsefalse1111falsefalsefalse7truefalsefalse1111falsefalsefalse8falsefalsefalse00falsefalsefalse9falsefalsefalse00falsefalsefalse10falsefalsefalse00falsefalsefalse11falsefalsefalse00falsefalsefalse12falsefalsefalse00falsefalsefalse13falsefalsefalse00falsefalsefalse14falsefalsefalse00falsefalsefalse15falsefalsefalse00falsefalsefalse16falsefalsefalse00falsefalsefalse17falsefalsefalse00falsefalsefalse18falsefalsefalse00falsefalsefalse19falsefalsefalse00falsefalsefalse20falsefalsefalse00falsefalsefalse21falsefalsefalse00falsefalsefalse22falsefalsefalse00falsefalsefalse23falsefalsefalse00falsefalsefalse24falsefalsefalse00falsefalsefalse25falsefalsefalse00falsefalsefalse26falsefalsefalse00falsefalsefalse27falsefalsefalse00falsefalsefalse28falsefalsefalse00falsefalsefalse29falsefalsefalse00falsefalsefalse30falsefalsefalse00falsefalsefalse31falsefalsefalse00falsefalsefalse32falsefalsefalse00falsefalsefalse33falsefalsefalse00falsefalsefalse34falsefalsefalse00falsefalsefalse35falsefalsefalse00falsefalsefalse36falsefalsefalse00falsefalsefalsexbrli:integerItemTypeintegerRepresents the average number of contracts per derivative transaction entered into by the entity during the period.No definition available.false256Average number of contracts per transaction13false 4gac_DecreaseInNotionalAmountOfDerivativeInstrumentsgac_falsecreditdurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalse5falsefalsefalse00falsefalsefalse6falsefalsefalse00falsefalsefalse7falsefalsefalse00falsefalsefalse8falsefalsefalse00falsefalsefalse9falsefalsefalse00falsefalsefalse10falsefalsefalse00falsefalsefalse11falsefalsefalse00falsefalsefalse12falsefalsefalse00falsefalsefalse13falsefalsefalse00falsefalsefalse14truefalsefalse201311000201311falsefalsefalse15falsefalsefalse00falsefalsefalse16falsefalsefalse00falsefalsefalse17falsefalsefalse00falsefalsefalse18falsefalsefalse00falsefalsefalse19falsefalsefalse00falsefalsefalse20falsefalsefalse00falsefalsefalse21falsefalsefalse00falsefalsefalse22falsefalsefalse00falsefalsefalse23falsefalsefalse00falsefalsefalse24falsefalsefalse00falsefalsefalse25falsefalsefalse00falsefalsefalse26falsefalsefalse00falsefalsefalse27falsefalsefalse00falsefalsefalse28falsefalsefalse00falsefalsefalse29falsefalsefalse00falsefalsefalse30falsefalsefalse00falsefalsefalse31falsefalsefalse00falsefalsefalse32falsefalsefalse00falsefalsefalse33falsefalsefalse00falsefalsefalse34falsefalsefalse00falsefalsefalse35falsefalsefalse00falsefalsefalse36falsefalsefalse00falsefalsefalsexbrli:monetaryItemTypemonetaryRepresents the amount of decrease in the notional amount of derivative instruments of the entity.No definition available.false2Decrease in derivative notional amount as a result of a change in interest rate risk hedging strategy14false 4gac_IncreaseInNotionalAmountOfDerivativeInstrumentsgac_falsedebitdurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalse5falsefalsefalse00falsefalsefalse6falsefalsefalse00falsefalsefalse7falsefalsefalse00falsefalsefalse8falsefalsefalse00falsefalsefalse9falsefalsefalse00falsefalsefalse10falsefalsefalse00falsefalsefalse11falsefalsefalse00falsefalsefalse12truefalsefalse210469000210469falsefalsefalse13falsefalsefalse00falsefalsefalse14falsefalsefalse00falsefalsefalse15falsefalsefalse00falsefalsefalse16falsefalsefalse00falsefalsefalse17falsefalsefalse00falsefalsefalse18falsefalsefalse00falsefalsefalse19falsefalsefalse00falsefalsefalse20falsefalsefalse00falsefalsefalse21falsefalsefalse00falsefalsefalse22falsefalsefalse00falsefalsefalse23falsefalsefalse00falsefalsefalse24falsefalsefalse00falsefalsefalse25falsefalsefalse00falsefalsefalse26falsefalsefalse00falsefalsefalse27falsefalsefalse00falsefalsefalse28falsefalsefalse00falsefalsefalse29falsefalsefalse00falsefalsefalse30falsefalsefalse00falsefalsefalse31falsefalsefalse00falsefalsefalse32falsefalsefalse00falsefalsefalse33falsefalsefalse00falsefalsefalse34falsefalsefalse00falsefalsefalse35falsefalsefalse00falsefalsefalse36falsefalsefalse00falsefalsefalsexbrli:monetaryItemTypemonetaryRepresents the amount of increase in the notional amount of derivative instruments of the entity.No definition available.false2Increase in derivatives notional amount due to additional swaps opened to hedge newly purchased assets denominated in British pounds and Euros15false 4us-gaap_DerivativeGainLossOnDerivativeNetus-gaap_truecreditdurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse52790005279falsefalsefalse2truefalsefalse21950002195falsefalsefalse3truefalsefalse48050004805falsefalsefalse4truefalsefalse1038200010382falsefalsefalse5falsefalsefalse00falsefalsefalse6falsefalsefalse00falsefalsefalse7falsefalsefalse00falsefalsefalse8falsefalsefalse00falsefalsefalse9falsefalsefalse00falsefalsefalse10falsefalsefalse00falsefalsefalse11falsefalsefalse00falsefalsefalse12falsefalsefalse00falsefalsefalse13falsefalsefalse00falsefalsefalse14falsefalsefalse00falsefalsefalse15falsefalsefalse00falsefalsefalse16falsefalsefalse00falsefalsefalse17falsefalsefalse00falsefalsefalse18falsefalsefalse00falsefalsefalse19falsefalsefalse00falsefalsefalse20falsefalsefalse00falsefalsefalse21falsefalsefalse00falsefalsefalse22falsefalsefalse00falsefalsefalse23falsefalsefalse00falsefalsefalse24falsefalsefalse00falsefalsefalse25falsefalsefalse00falsefalsefalse26falsefalsefalse00falsefalsefalse27falsefalsefalse00falsefalsefalse28falsefalsefalse00falsefalsefalse29falsefalsefalse00falsefalsefalse30falsefalsefalse00falsefalsefalse31falsefalsefalse00falsefalsefalse32falsefalsefalse00falsefalsefalse33falsefalsefalse00falsefalsefalse34falsefalsefalse00falsefalsefalse35falsefalsefalse00falsefalsefalse36falsefalsefalse00falsefalsefalsexbrli:monetaryItemTypemonetaryNet Increase or Decrease in the fair value of the derivative or group of derivatives included in earnings.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5618551-113959 false2Total derivative gains (losses) in net investment income16false 4gac_DerivativeGainLossOnClosedDerivativePositionsNetgac_falsecreditdurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse-4038000-4038USD$falsetruefalse2truefalsefalse-869000-869USD$falsetruefalse3truefalsefalse-3588000-3588USD$falsetruefalse4truefalsefalse-6963000-6963USD$falsetruefalse5falsefalsefalse00falsefalsefalse6falsefalsefalse00falsefalsefalse7falsefalsefalse00falsefalsefalse8falsefalsefalse00falsefalsefalse9falsefalsefalse00falsefalsefalse10falsefalsefalse00falsefalsefalse11falsefalsefalse00falsefalsefalse12falsefalsefalse00falsefalsefalse13falsefalsefalse00falsefalsefalse14falsefalsefalse00falsefalsefalse15falsefalsefalse00falsefalsefalse16falsefalsefalse00falsefalsefalse17falsefalsefalse00falsefalsefalse18falsefalsefalse00falsefalsefalse19falsefalsefalse00falsefalsefalse20falsefalsefalse00falsefalsefalse21falsefalsefalse00falsefalsefalse22falsefalsefalse00falsefalsefalse23falsefalsefalse00falsefalsefalse24falsefalsefalse00falsefalsefalse25falsefalsefalse00falsefalsefalse26falsefalsefalse00falsefalsefalse27falsefalsefalse00falsefalsefalse28falsefalsefalse00falsefalsefalse29falsefalsefalse00falsefalsefalse30falsefalsefalse00falsefalsefalse31falsefalsefalse00falsefalsefalse32falsefalsefalse00falsefalsefalse33falsefalsefalse00falsefalsefalse34falsefalsefalse00falsefalsefalse35falsefalsefalse00falsefalsefalse36falsefalsefalse00falsefalsefalsexbrli:monetaryItemTypemonetaryThis element represents the net increase or decrease in the fair value of the closed positions derivatives included in earnings.No definition available.false2Net investment gains (losses) on closed derivative positionsfalseDerivative Financial Instruments (Details) (USD $)ThousandsUnKnownUnKnownUnKnowntruefalsefalseSheethttp://www.greatwest.com/role/DisclosureDerivativeFinancialInstrumentsDetails3616