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Certain Nontraditional Long-Duration Contracts (Summary of the Changes in General Account Liabilities for Guarantees on Variable Contracts) (Details) (variableannuity, USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Net Amount At Risk By Product And Guarantee [Line Items]      
GuaranteedBenefitLiabilityGross, Beginning Balance $ 989,375us-gaap_LiabilitiesForGuaranteesOnLongDurationContractsGuaranteedBenefitLiabilityGross $ 2,039,178us-gaap_LiabilitiesForGuaranteesOnLongDurationContractsGuaranteedBenefitLiabilityGross $ 1,975,689us-gaap_LiabilitiesForGuaranteesOnLongDurationContractsGuaranteedBenefitLiabilityGross
Incurred guarantee benefits 2,424,215cik881453_Guaranteedbenefitsincurredother [1] (1,029,750)cik881453_Guaranteedbenefitsincurredother [1] 95,602cik881453_Guaranteedbenefitsincurredother [1]
GuaranteedBenefitsPaid (26,633)us-gaap_LiabilitiesForGuaranteesOnLongDurationContractsBenefitsPaid (28,254)us-gaap_LiabilitiesForGuaranteesOnLongDurationContractsBenefitsPaid (32,113)us-gaap_LiabilitiesForGuaranteesOnLongDurationContractsBenefitsPaid
GuaranteedBenefitLiabilityGross, Ending Balance 3,387,128us-gaap_LiabilitiesForGuaranteesOnLongDurationContractsGuaranteedBenefitLiabilityGross 989,375us-gaap_LiabilitiesForGuaranteesOnLongDurationContractsGuaranteedBenefitLiabilityGross 2,039,178us-gaap_LiabilitiesForGuaranteesOnLongDurationContractsGuaranteedBenefitLiabilityGross
Changes in Unrealized Investment Gains and Losses 171cik881453_Changesinunrealizedinvestmentgainsandlossesonlongdurationcontracts 8,201cik881453_Changesinunrealizedinvestmentgainsandlossesonlongdurationcontracts  
GuaranteedMinimumAccumulationWithdrawalIncomeAndWithdrawalBenefitsMember [Member]      
Net Amount At Risk By Product And Guarantee [Line Items]      
GuaranteedBenefitLiabilityGross, Beginning Balance 778,226us-gaap_LiabilitiesForGuaranteesOnLongDurationContractsGuaranteedBenefitLiabilityGross
/ us-gaap_NetAmountAtRiskByProductAndGuaranteeGuaranteeTypeAxis
= cik881453_GuaranteedminimumaccumulationwithdrawalincomeandwithdrawalbenefitsmemberMember
/ us-gaap_ProductOrServiceAxis
= us-gaap_VariableAnnuityMember		 1,793,135us-gaap_LiabilitiesForGuaranteesOnLongDurationContractsGuaranteedBenefitLiabilityGross
/ us-gaap_NetAmountAtRiskByProductAndGuaranteeGuaranteeTypeAxis
= cik881453_GuaranteedminimumaccumulationwithdrawalincomeandwithdrawalbenefitsmemberMember
/ us-gaap_ProductOrServiceAxis
= us-gaap_VariableAnnuityMember		 1,783,594us-gaap_LiabilitiesForGuaranteesOnLongDurationContractsGuaranteedBenefitLiabilityGross
/ us-gaap_NetAmountAtRiskByProductAndGuaranteeGuaranteeTypeAxis
= cik881453_GuaranteedminimumaccumulationwithdrawalincomeandwithdrawalbenefitsmemberMember
/ us-gaap_ProductOrServiceAxis
= us-gaap_VariableAnnuityMember
Incurred guarantee benefits 2,334,185cik881453_Guaranteedbenefitsincurredother
/ us-gaap_NetAmountAtRiskByProductAndGuaranteeGuaranteeTypeAxis
= cik881453_GuaranteedminimumaccumulationwithdrawalincomeandwithdrawalbenefitsmemberMember
/ us-gaap_ProductOrServiceAxis
= us-gaap_VariableAnnuityMember		 [1] (1,014,909)cik881453_Guaranteedbenefitsincurredother
/ us-gaap_NetAmountAtRiskByProductAndGuaranteeGuaranteeTypeAxis
= cik881453_GuaranteedminimumaccumulationwithdrawalincomeandwithdrawalbenefitsmemberMember
/ us-gaap_ProductOrServiceAxis
= us-gaap_VariableAnnuityMember		 [1] 9,541cik881453_Guaranteedbenefitsincurredother
/ us-gaap_NetAmountAtRiskByProductAndGuaranteeGuaranteeTypeAxis
= cik881453_GuaranteedminimumaccumulationwithdrawalincomeandwithdrawalbenefitsmemberMember
/ us-gaap_ProductOrServiceAxis
= us-gaap_VariableAnnuityMember		 [1]
GuaranteedBenefitsPaid 0us-gaap_LiabilitiesForGuaranteesOnLongDurationContractsBenefitsPaid
/ us-gaap_NetAmountAtRiskByProductAndGuaranteeGuaranteeTypeAxis
= cik881453_GuaranteedminimumaccumulationwithdrawalincomeandwithdrawalbenefitsmemberMember
/ us-gaap_ProductOrServiceAxis
= us-gaap_VariableAnnuityMember		 0us-gaap_LiabilitiesForGuaranteesOnLongDurationContractsBenefitsPaid
/ us-gaap_NetAmountAtRiskByProductAndGuaranteeGuaranteeTypeAxis
= cik881453_GuaranteedminimumaccumulationwithdrawalincomeandwithdrawalbenefitsmemberMember
/ us-gaap_ProductOrServiceAxis
= us-gaap_VariableAnnuityMember		 0us-gaap_LiabilitiesForGuaranteesOnLongDurationContractsBenefitsPaid
/ us-gaap_NetAmountAtRiskByProductAndGuaranteeGuaranteeTypeAxis
= cik881453_GuaranteedminimumaccumulationwithdrawalincomeandwithdrawalbenefitsmemberMember
/ us-gaap_ProductOrServiceAxis
= us-gaap_VariableAnnuityMember
GuaranteedBenefitLiabilityGross, Ending Balance 3,112,411us-gaap_LiabilitiesForGuaranteesOnLongDurationContractsGuaranteedBenefitLiabilityGross
/ us-gaap_NetAmountAtRiskByProductAndGuaranteeGuaranteeTypeAxis
= cik881453_GuaranteedminimumaccumulationwithdrawalincomeandwithdrawalbenefitsmemberMember
/ us-gaap_ProductOrServiceAxis
= us-gaap_VariableAnnuityMember		 778,226us-gaap_LiabilitiesForGuaranteesOnLongDurationContractsGuaranteedBenefitLiabilityGross
/ us-gaap_NetAmountAtRiskByProductAndGuaranteeGuaranteeTypeAxis
= cik881453_GuaranteedminimumaccumulationwithdrawalincomeandwithdrawalbenefitsmemberMember
/ us-gaap_ProductOrServiceAxis
= us-gaap_VariableAnnuityMember		 1,793,135us-gaap_LiabilitiesForGuaranteesOnLongDurationContractsGuaranteedBenefitLiabilityGross
/ us-gaap_NetAmountAtRiskByProductAndGuaranteeGuaranteeTypeAxis
= cik881453_GuaranteedminimumaccumulationwithdrawalincomeandwithdrawalbenefitsmemberMember
/ us-gaap_ProductOrServiceAxis
= us-gaap_VariableAnnuityMember
Changes in Unrealized Investment Gains and Losses 0cik881453_Changesinunrealizedinvestmentgainsandlossesonlongdurationcontracts
/ us-gaap_NetAmountAtRiskByProductAndGuaranteeGuaranteeTypeAxis
= cik881453_GuaranteedminimumaccumulationwithdrawalincomeandwithdrawalbenefitsmemberMember
/ us-gaap_ProductOrServiceAxis
= us-gaap_VariableAnnuityMember		 0cik881453_Changesinunrealizedinvestmentgainsandlossesonlongdurationcontracts
/ us-gaap_NetAmountAtRiskByProductAndGuaranteeGuaranteeTypeAxis
= cik881453_GuaranteedminimumaccumulationwithdrawalincomeandwithdrawalbenefitsmemberMember
/ us-gaap_ProductOrServiceAxis
= us-gaap_VariableAnnuityMember		  
GuaranteedMinimumIncomeBenefitMember      
Net Amount At Risk By Product And Guarantee [Line Items]      
GuaranteedBenefitLiabilityGross, Beginning Balance 11,279us-gaap_LiabilitiesForGuaranteesOnLongDurationContractsGuaranteedBenefitLiabilityGross
/ us-gaap_NetAmountAtRiskByProductAndGuaranteeGuaranteeTypeAxis
= us-gaap_GuaranteedMinimumIncomeBenefitMember
/ us-gaap_ProductOrServiceAxis
= us-gaap_VariableAnnuityMember		 23,516us-gaap_LiabilitiesForGuaranteesOnLongDurationContractsGuaranteedBenefitLiabilityGross
/ us-gaap_NetAmountAtRiskByProductAndGuaranteeGuaranteeTypeAxis
= us-gaap_GuaranteedMinimumIncomeBenefitMember
/ us-gaap_ProductOrServiceAxis
= us-gaap_VariableAnnuityMember		 14,377us-gaap_LiabilitiesForGuaranteesOnLongDurationContractsGuaranteedBenefitLiabilityGross
/ us-gaap_NetAmountAtRiskByProductAndGuaranteeGuaranteeTypeAxis
= us-gaap_GuaranteedMinimumIncomeBenefitMember
/ us-gaap_ProductOrServiceAxis
= us-gaap_VariableAnnuityMember
Incurred guarantee benefits 8,506cik881453_Guaranteedbenefitsincurredother
/ us-gaap_NetAmountAtRiskByProductAndGuaranteeGuaranteeTypeAxis
= us-gaap_GuaranteedMinimumIncomeBenefitMember
/ us-gaap_ProductOrServiceAxis
= us-gaap_VariableAnnuityMember		 [1] (11,650)cik881453_Guaranteedbenefitsincurredother
/ us-gaap_NetAmountAtRiskByProductAndGuaranteeGuaranteeTypeAxis
= us-gaap_GuaranteedMinimumIncomeBenefitMember
/ us-gaap_ProductOrServiceAxis
= us-gaap_VariableAnnuityMember		 [1] 9,821cik881453_Guaranteedbenefitsincurredother
/ us-gaap_NetAmountAtRiskByProductAndGuaranteeGuaranteeTypeAxis
= us-gaap_GuaranteedMinimumIncomeBenefitMember
/ us-gaap_ProductOrServiceAxis
= us-gaap_VariableAnnuityMember		 [1]
GuaranteedBenefitsPaid (724)us-gaap_LiabilitiesForGuaranteesOnLongDurationContractsBenefitsPaid
/ us-gaap_NetAmountAtRiskByProductAndGuaranteeGuaranteeTypeAxis
= us-gaap_GuaranteedMinimumIncomeBenefitMember
/ us-gaap_ProductOrServiceAxis
= us-gaap_VariableAnnuityMember		 (747)us-gaap_LiabilitiesForGuaranteesOnLongDurationContractsBenefitsPaid
/ us-gaap_NetAmountAtRiskByProductAndGuaranteeGuaranteeTypeAxis
= us-gaap_GuaranteedMinimumIncomeBenefitMember
/ us-gaap_ProductOrServiceAxis
= us-gaap_VariableAnnuityMember		 (682)us-gaap_LiabilitiesForGuaranteesOnLongDurationContractsBenefitsPaid
/ us-gaap_NetAmountAtRiskByProductAndGuaranteeGuaranteeTypeAxis
= us-gaap_GuaranteedMinimumIncomeBenefitMember
/ us-gaap_ProductOrServiceAxis
= us-gaap_VariableAnnuityMember
GuaranteedBenefitLiabilityGross, Ending Balance 19,104us-gaap_LiabilitiesForGuaranteesOnLongDurationContractsGuaranteedBenefitLiabilityGross
/ us-gaap_NetAmountAtRiskByProductAndGuaranteeGuaranteeTypeAxis
= us-gaap_GuaranteedMinimumIncomeBenefitMember
/ us-gaap_ProductOrServiceAxis
= us-gaap_VariableAnnuityMember		 11,279us-gaap_LiabilitiesForGuaranteesOnLongDurationContractsGuaranteedBenefitLiabilityGross
/ us-gaap_NetAmountAtRiskByProductAndGuaranteeGuaranteeTypeAxis
= us-gaap_GuaranteedMinimumIncomeBenefitMember
/ us-gaap_ProductOrServiceAxis
= us-gaap_VariableAnnuityMember		 23,516us-gaap_LiabilitiesForGuaranteesOnLongDurationContractsGuaranteedBenefitLiabilityGross
/ us-gaap_NetAmountAtRiskByProductAndGuaranteeGuaranteeTypeAxis
= us-gaap_GuaranteedMinimumIncomeBenefitMember
/ us-gaap_ProductOrServiceAxis
= us-gaap_VariableAnnuityMember
Changes in Unrealized Investment Gains and Losses 43cik881453_Changesinunrealizedinvestmentgainsandlossesonlongdurationcontracts
/ us-gaap_NetAmountAtRiskByProductAndGuaranteeGuaranteeTypeAxis
= us-gaap_GuaranteedMinimumIncomeBenefitMember
/ us-gaap_ProductOrServiceAxis
= us-gaap_VariableAnnuityMember		 160cik881453_Changesinunrealizedinvestmentgainsandlossesonlongdurationcontracts
/ us-gaap_NetAmountAtRiskByProductAndGuaranteeGuaranteeTypeAxis
= us-gaap_GuaranteedMinimumIncomeBenefitMember
/ us-gaap_ProductOrServiceAxis
= us-gaap_VariableAnnuityMember		  
GuaranteedMinimumDeathBenefitMember      
Net Amount At Risk By Product And Guarantee [Line Items]      
GuaranteedBenefitLiabilityGross, Beginning Balance 199,870us-gaap_LiabilitiesForGuaranteesOnLongDurationContractsGuaranteedBenefitLiabilityGross
/ us-gaap_NetAmountAtRiskByProductAndGuaranteeGuaranteeTypeAxis
= us-gaap_GuaranteedMinimumDeathBenefitMember
/ us-gaap_ProductOrServiceAxis
= us-gaap_VariableAnnuityMember		 222,527us-gaap_LiabilitiesForGuaranteesOnLongDurationContractsGuaranteedBenefitLiabilityGross
/ us-gaap_NetAmountAtRiskByProductAndGuaranteeGuaranteeTypeAxis
= us-gaap_GuaranteedMinimumDeathBenefitMember
/ us-gaap_ProductOrServiceAxis
= us-gaap_VariableAnnuityMember		 177,718us-gaap_LiabilitiesForGuaranteesOnLongDurationContractsGuaranteedBenefitLiabilityGross
/ us-gaap_NetAmountAtRiskByProductAndGuaranteeGuaranteeTypeAxis
= us-gaap_GuaranteedMinimumDeathBenefitMember
/ us-gaap_ProductOrServiceAxis
= us-gaap_VariableAnnuityMember
Incurred guarantee benefits 81,524cik881453_Guaranteedbenefitsincurredother
/ us-gaap_NetAmountAtRiskByProductAndGuaranteeGuaranteeTypeAxis
= us-gaap_GuaranteedMinimumDeathBenefitMember
/ us-gaap_ProductOrServiceAxis
= us-gaap_VariableAnnuityMember		 [1] (3,191)cik881453_Guaranteedbenefitsincurredother
/ us-gaap_NetAmountAtRiskByProductAndGuaranteeGuaranteeTypeAxis
= us-gaap_GuaranteedMinimumDeathBenefitMember
/ us-gaap_ProductOrServiceAxis
= us-gaap_VariableAnnuityMember		 [1] 76,240cik881453_Guaranteedbenefitsincurredother
/ us-gaap_NetAmountAtRiskByProductAndGuaranteeGuaranteeTypeAxis
= us-gaap_GuaranteedMinimumDeathBenefitMember
/ us-gaap_ProductOrServiceAxis
= us-gaap_VariableAnnuityMember		 [1]
GuaranteedBenefitsPaid (25,909)us-gaap_LiabilitiesForGuaranteesOnLongDurationContractsBenefitsPaid
/ us-gaap_NetAmountAtRiskByProductAndGuaranteeGuaranteeTypeAxis
= us-gaap_GuaranteedMinimumDeathBenefitMember
/ us-gaap_ProductOrServiceAxis
= us-gaap_VariableAnnuityMember		 (27,507)us-gaap_LiabilitiesForGuaranteesOnLongDurationContractsBenefitsPaid
/ us-gaap_NetAmountAtRiskByProductAndGuaranteeGuaranteeTypeAxis
= us-gaap_GuaranteedMinimumDeathBenefitMember
/ us-gaap_ProductOrServiceAxis
= us-gaap_VariableAnnuityMember		 (31,431)us-gaap_LiabilitiesForGuaranteesOnLongDurationContractsBenefitsPaid
/ us-gaap_NetAmountAtRiskByProductAndGuaranteeGuaranteeTypeAxis
= us-gaap_GuaranteedMinimumDeathBenefitMember
/ us-gaap_ProductOrServiceAxis
= us-gaap_VariableAnnuityMember
GuaranteedBenefitLiabilityGross, Ending Balance 255,613us-gaap_LiabilitiesForGuaranteesOnLongDurationContractsGuaranteedBenefitLiabilityGross
/ us-gaap_NetAmountAtRiskByProductAndGuaranteeGuaranteeTypeAxis
= us-gaap_GuaranteedMinimumDeathBenefitMember
/ us-gaap_ProductOrServiceAxis
= us-gaap_VariableAnnuityMember		 199,870us-gaap_LiabilitiesForGuaranteesOnLongDurationContractsGuaranteedBenefitLiabilityGross
/ us-gaap_NetAmountAtRiskByProductAndGuaranteeGuaranteeTypeAxis
= us-gaap_GuaranteedMinimumDeathBenefitMember
/ us-gaap_ProductOrServiceAxis
= us-gaap_VariableAnnuityMember		 222,527us-gaap_LiabilitiesForGuaranteesOnLongDurationContractsGuaranteedBenefitLiabilityGross
/ us-gaap_NetAmountAtRiskByProductAndGuaranteeGuaranteeTypeAxis
= us-gaap_GuaranteedMinimumDeathBenefitMember
/ us-gaap_ProductOrServiceAxis
= us-gaap_VariableAnnuityMember
Changes in Unrealized Investment Gains and Losses $ 128cik881453_Changesinunrealizedinvestmentgainsandlossesonlongdurationcontracts
/ us-gaap_NetAmountAtRiskByProductAndGuaranteeGuaranteeTypeAxis
= us-gaap_GuaranteedMinimumDeathBenefitMember
/ us-gaap_ProductOrServiceAxis
= us-gaap_VariableAnnuityMember		 $ 8,041cik881453_Changesinunrealizedinvestmentgainsandlossesonlongdurationcontracts
/ us-gaap_NetAmountAtRiskByProductAndGuaranteeGuaranteeTypeAxis
= us-gaap_GuaranteedMinimumDeathBenefitMember
/ us-gaap_ProductOrServiceAxis
= us-gaap_VariableAnnuityMember		  
[1] Incurred guarantee benefits include the portion of assessments established as additions to reserve as well as changes in estimates affecting the reserves. Also includes changes in the fair value of features accounted for as derivatives.