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Reinsurance (Details) (USD $)
12 Months Ended 0 Months Ended
Dec. 31, 2014
counterparty
Dec. 31, 2013
Dec. 31, 2012
Jan. 02, 2013
Insurance [Abstract]        
Initial maximum coverage, per individual life retained $ 3,500,000gac_InitialMaximumLiabilityOfCoveragePerIndividualLifeRetained      
Maximum annual growth due to automatic policy increases in coverage, per annum 175,000gac_MaximumAnnualGrowthInMaximumLiabilityOfCoveragePerIndividualLifeRetained      
Overall maximum growth due to automatic increase in coverage 1,000,000gac_ThresholdLimitOfOverallGrowthInMaximumLiabilityOfCoveragePerIndividualLifeRetained      
Reinsurance receivable 611,270,000us-gaap_ReinsuranceRecoverables 588,533,000us-gaap_ReinsuranceRecoverables    
Reinsurance receivables, associated with reinsurance agreements with related parties 529,921,000gac_RelatedPartyTransactionReinsuranceRecoverables 502,471,000gac_RelatedPartyTransactionReinsuranceRecoverables    
Number of insurers and reinsurers from whom risk is assumed, in counterparties 40gac_NumberOfInsurersAndReinsurersFromWhomRiskAssumed      
Life insurance in-force and total premium income        
Life insurance and annuity future benefits with life contingencies 15,349,322,000us-gaap_LiabilityForFuturePolicyBenefitsLife 14,296,153,000us-gaap_LiabilityForFuturePolicyBenefitsLife    
Life insurance in-force        
Written and earned direct 94,104,689,000us-gaap_DirectPremiumsLifeInsuranceInForce 92,180,904,000us-gaap_DirectPremiumsLifeInsuranceInForce    
Reinsurance ceded (9,773,885,000)us-gaap_CededPremiumsLifeInsuranceInForce (9,512,583,000)us-gaap_CededPremiumsLifeInsuranceInForce    
Reinsurance assumed 61,911,865,000us-gaap_AssumedPremiumsLifeInsuranceInForce 66,209,732,000us-gaap_AssumedPremiumsLifeInsuranceInForce    
Net 146,242,669,000us-gaap_PremiumsNetLifeInsuranceInForce 148,878,053,000us-gaap_PremiumsNetLifeInsuranceInForce    
Percentage of amount assumed to net 42.00%us-gaap_LifeInsuranceInForcePremiumsPercentageAssumedToNet 44.00%us-gaap_LifeInsuranceInForcePremiumsPercentageAssumedToNet    
Premium income        
Net 446,395,000us-gaap_PremiumsEarnedNet 464,093,000us-gaap_PremiumsEarnedNet 422,153,000us-gaap_PremiumsEarnedNet  
Life and other policy benefits, reinsurance recoveries 23,965,000us-gaap_ReinsuranceCostsAndRecoveriesNet 34,716,000us-gaap_ReinsuranceCostsAndRecoveriesNet 46,492,000us-gaap_ReinsuranceCostsAndRecoveriesNet  
Maximum        
Life insurance in-force and total premium income        
Life insurance and annuity future benefits with life contingencies 4,500,000us-gaap_LiabilityForFuturePolicyBenefitsLife
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
     
CLAC        
Insurance [Abstract]        
Reinsurance receivable       (42,297,000)us-gaap_ReinsuranceRecoverables
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= gac_CanadaLifeAssuranceCompanyMember
Life insurance in-force and total premium income        
Total reinsurance receivable due from CLAC, a related party (as a percent) 87.00%us-gaap_ReinsuranceRecoverablesPercentageOfTotal
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= gac_CanadaLifeAssuranceCompanyMember
85.00%us-gaap_ReinsuranceRecoverablesPercentageOfTotal
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= gac_CanadaLifeAssuranceCompanyMember
   
Premium income        
Net       42,297,000us-gaap_PremiumsEarnedNet
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= gac_CanadaLifeAssuranceCompanyMember
Individual        
Life insurance in-force        
Written and earned direct 52,836,475,000us-gaap_DirectPremiumsLifeInsuranceInForce
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= us-gaap_IndividualPoliciesMember
51,660,487,000us-gaap_DirectPremiumsLifeInsuranceInForce
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= us-gaap_IndividualPoliciesMember
   
Reinsurance ceded (9,773,885,000)us-gaap_CededPremiumsLifeInsuranceInForce
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= us-gaap_IndividualPoliciesMember
(9,512,583,000)us-gaap_CededPremiumsLifeInsuranceInForce
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= us-gaap_IndividualPoliciesMember
   
Reinsurance assumed 61,911,865,000us-gaap_AssumedPremiumsLifeInsuranceInForce
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= us-gaap_IndividualPoliciesMember
66,209,732,000us-gaap_AssumedPremiumsLifeInsuranceInForce
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= us-gaap_IndividualPoliciesMember
   
Net 104,974,455,000us-gaap_PremiumsNetLifeInsuranceInForce
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= us-gaap_IndividualPoliciesMember
108,357,636,000us-gaap_PremiumsNetLifeInsuranceInForce
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= us-gaap_IndividualPoliciesMember
   
Percentage of amount assumed to net 59.00%us-gaap_LifeInsuranceInForcePremiumsPercentageAssumedToNet
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= us-gaap_IndividualPoliciesMember
61.00%us-gaap_LifeInsuranceInForcePremiumsPercentageAssumedToNet
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= us-gaap_IndividualPoliciesMember
   
Group        
Life insurance in-force        
Written and earned direct 41,268,214,000us-gaap_DirectPremiumsLifeInsuranceInForce
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= us-gaap_GroupPoliciesMember
40,520,417,000us-gaap_DirectPremiumsLifeInsuranceInForce
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= us-gaap_GroupPoliciesMember
   
Reinsurance ceded   0us-gaap_CededPremiumsLifeInsuranceInForce
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= us-gaap_GroupPoliciesMember
   
Reinsurance assumed   0us-gaap_AssumedPremiumsLifeInsuranceInForce
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= us-gaap_GroupPoliciesMember
   
Net 41,268,214,000us-gaap_PremiumsNetLifeInsuranceInForce
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= us-gaap_GroupPoliciesMember
40,520,417,000us-gaap_PremiumsNetLifeInsuranceInForce
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= us-gaap_GroupPoliciesMember
   
Percentage of amount assumed to net 0.00%us-gaap_LifeInsuranceInForcePremiumsPercentageAssumedToNet
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= us-gaap_GroupPoliciesMember
0.00%us-gaap_LifeInsuranceInForcePremiumsPercentageAssumedToNet
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= us-gaap_GroupPoliciesMember
   
Premium Income        
Premium income        
Written and earned direct 362,214,000us-gaap_DirectPremiumsEarned
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= gac_PremiumIncomeMember
319,100,000us-gaap_DirectPremiumsEarned
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= gac_PremiumIncomeMember
326,948,000us-gaap_DirectPremiumsEarned
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= gac_PremiumIncomeMember
 
Reinsurance ceded (46,020,000)us-gaap_CededPremiumsEarned
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= gac_PremiumIncomeMember
(1,426,000)us-gaap_CededPremiumsEarned
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= gac_PremiumIncomeMember
(50,302,000)us-gaap_CededPremiumsEarned
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= gac_PremiumIncomeMember
 
Reinsurance assumed 130,201,000us-gaap_AssumedPremiumsEarned
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= gac_PremiumIncomeMember
146,419,000us-gaap_AssumedPremiumsEarned
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= gac_PremiumIncomeMember
145,507,000us-gaap_AssumedPremiumsEarned
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= gac_PremiumIncomeMember
 
Net 446,395,000us-gaap_PremiumsEarnedNet
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= gac_PremiumIncomeMember
464,093,000us-gaap_PremiumsEarnedNet
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= gac_PremiumIncomeMember
422,153,000us-gaap_PremiumsEarnedNet
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= gac_PremiumIncomeMember
 
Life insurance        
Premium income        
Written and earned direct 360,959,000us-gaap_DirectPremiumsEarned
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= us-gaap_LifeInsuranceSegmentMember
315,100,000us-gaap_DirectPremiumsEarned
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= us-gaap_LifeInsuranceSegmentMember
323,236,000us-gaap_DirectPremiumsEarned
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= us-gaap_LifeInsuranceSegmentMember
 
Reinsurance ceded (45,925,000)us-gaap_CededPremiumsEarned
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= us-gaap_LifeInsuranceSegmentMember
(1,338,000)us-gaap_CededPremiumsEarned
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= us-gaap_LifeInsuranceSegmentMember
(53,950,000)us-gaap_CededPremiumsEarned
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= us-gaap_LifeInsuranceSegmentMember
 
Reinsurance assumed 130,201,000us-gaap_AssumedPremiumsEarned
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= us-gaap_LifeInsuranceSegmentMember
146,419,000us-gaap_AssumedPremiumsEarned
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= us-gaap_LifeInsuranceSegmentMember
145,507,000us-gaap_AssumedPremiumsEarned
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= us-gaap_LifeInsuranceSegmentMember
 
Net 445,235,000us-gaap_PremiumsEarnedNet
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= us-gaap_LifeInsuranceSegmentMember
460,181,000us-gaap_PremiumsEarnedNet
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= us-gaap_LifeInsuranceSegmentMember
414,793,000us-gaap_PremiumsEarnedNet
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= us-gaap_LifeInsuranceSegmentMember
 
Annuities        
Premium income        
Written and earned direct 1,255,000us-gaap_DirectPremiumsEarned
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= us-gaap_VariableAnnuityMember
4,000,000us-gaap_DirectPremiumsEarned
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= us-gaap_VariableAnnuityMember
3,712,000us-gaap_DirectPremiumsEarned
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= us-gaap_VariableAnnuityMember
 
Reinsurance ceded (95,000)us-gaap_CededPremiumsEarned
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= us-gaap_VariableAnnuityMember
(88,000)us-gaap_CededPremiumsEarned
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= us-gaap_VariableAnnuityMember
3,648,000us-gaap_CededPremiumsEarned
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= us-gaap_VariableAnnuityMember
 
Net $ 1,160,000us-gaap_PremiumsEarnedNet
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= us-gaap_VariableAnnuityMember
$ 3,912,000us-gaap_PremiumsEarnedNet
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= us-gaap_VariableAnnuityMember
$ 7,360,000us-gaap_PremiumsEarnedNet
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= us-gaap_VariableAnnuityMember