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Fair Value Recurring not carried at FV (Details 5) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Assets    
Mortgage loans on real estate $ 3,363,570us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet $ 3,134,255us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet
Policy loans 4,130,062us-gaap_LoansInsurancePolicy 4,185,472us-gaap_LoansInsurancePolicy
Liabilities    
Policyholders’ funds 335,484us-gaap_PolicyholderFunds 345,689us-gaap_PolicyholderFunds
Commercial paper 98,589us-gaap_CommercialPaper 98,990us-gaap_CommercialPaper
Notice required to change policyholders' funds interest crediting rate 30 days  
Minimum    
Liabilities    
Estimated liquidation period of underlying assets of the funds 1 year  
Maximum    
Liabilities    
Estimated liquidation period of underlying assets of the funds 10 years  
Estimated fair value    
Assets    
Mortgage loans on real estate 3,558,111us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
3,197,292us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
Policy loans 4,130,062us-gaap_LoansInsurancePolicy
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
4,185,472us-gaap_LoansInsurancePolicy
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
Limited partnership interests 41,853us-gaap_CostMethodInvestmentsFairValueDisclosure
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
42,433us-gaap_CostMethodInvestmentsFairValueDisclosure
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
Other investments 43,263gac_OtherInvestmentsNotCarriedFairValueOnRecurringBasis
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
42,814gac_OtherInvestmentsNotCarriedFairValueOnRecurringBasis
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
Liabilities    
Annuity contract benefits without life contingencies 10,563,477gac_AnnuityContractBenefitsWithoutLifeContingenciesFairValueDisclosure
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
9,986,464gac_AnnuityContractBenefitsWithoutLifeContingenciesFairValueDisclosure
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
Policyholders’ funds 335,484us-gaap_PolicyholderFunds
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
345,689us-gaap_PolicyholderFunds
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
Commercial paper 98,589us-gaap_CommercialPaper
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
98,990us-gaap_CommercialPaper
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
Notes payable 564,904us-gaap_NotesPayableFairValueDisclosure
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
541,918us-gaap_NotesPayableFairValueDisclosure
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
Carrying amount    
Assets    
Mortgage loans on real estate 3,363,570us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
3,134,255us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
Policy loans 4,130,062us-gaap_LoansInsurancePolicy
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
4,185,472us-gaap_LoansInsurancePolicy
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
Limited partnership interests 38,796us-gaap_CostMethodInvestmentsFairValueDisclosure
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
44,551us-gaap_CostMethodInvestmentsFairValueDisclosure
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
Other investments 15,614gac_OtherInvestmentsNotCarriedFairValueOnRecurringBasis
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
16,643gac_OtherInvestmentsNotCarriedFairValueOnRecurringBasis
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
Liabilities    
Annuity contract benefits without life contingencies 10,569,147gac_AnnuityContractBenefitsWithoutLifeContingenciesFairValueDisclosure
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
10,263,043gac_AnnuityContractBenefitsWithoutLifeContingenciesFairValueDisclosure
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
Policyholders’ funds 335,484us-gaap_PolicyholderFunds
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
345,689us-gaap_PolicyholderFunds
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
Commercial paper 98,589us-gaap_CommercialPaper
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
98,990us-gaap_CommercialPaper
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
Notes payable $ 532,547us-gaap_NotesPayableFairValueDisclosure
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
$ 532,519us-gaap_NotesPayableFairValueDisclosure
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember