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Investments (Net Investment Income) (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Schedule of Investment Income, Reported Amounts, by Category [Line Items]      
Gross investment income $ 169,753cik881453_InvestmentIncome $ 224,447cik881453_InvestmentIncome $ 285,625cik881453_InvestmentIncome
Less: investment expenses (5,742)cik881453_InvestmentExpenses (6,564)cik881453_InvestmentExpenses (7,974)cik881453_InvestmentExpenses
Net Investment Income, Total 164,011us-gaap_NetInvestmentIncome 217,883us-gaap_NetInvestmentIncome 277,651us-gaap_NetInvestmentIncome
Available For Sale Fixed Maturities [Member]      
Schedule of Investment Income, Reported Amounts, by Category [Line Items]      
Gross investment income 140,114cik881453_InvestmentIncome
/ us-gaap_InvestmentTypeAxis
= cik881453_AvailableForSaleFixedMaturitiesMember		 191,043cik881453_InvestmentIncome
/ us-gaap_InvestmentTypeAxis
= cik881453_AvailableForSaleFixedMaturitiesMember		 246,479cik881453_InvestmentIncome
/ us-gaap_InvestmentTypeAxis
= cik881453_AvailableForSaleFixedMaturitiesMember
Equity Securities [Member]      
Schedule of Investment Income, Reported Amounts, by Category [Line Items]      
Gross investment income 0cik881453_InvestmentIncome
/ us-gaap_InvestmentTypeAxis
= us-gaap_EquitySecuritiesMember		 0cik881453_InvestmentIncome
/ us-gaap_InvestmentTypeAxis
= us-gaap_EquitySecuritiesMember		 7cik881453_InvestmentIncome
/ us-gaap_InvestmentTypeAxis
= us-gaap_EquitySecuritiesMember
Trading Account Assets [Member]      
Schedule of Investment Income, Reported Amounts, by Category [Line Items]      
Gross investment income 325cik881453_InvestmentIncome
/ us-gaap_InvestmentTypeAxis
= us-gaap_TradingAccountAssetsMember		 342cik881453_InvestmentIncome
/ us-gaap_InvestmentTypeAxis
= us-gaap_TradingAccountAssetsMember		 923cik881453_InvestmentIncome
/ us-gaap_InvestmentTypeAxis
= us-gaap_TradingAccountAssetsMember
Commercial Mortgage Loans [Member]      
Schedule of Investment Income, Reported Amounts, by Category [Line Items]      
Gross investment income 21,802cik881453_InvestmentIncome
/ us-gaap_InvestmentTypeAxis
= cik881453_CommercialMortgageLoansMember		 28,463cik881453_InvestmentIncome
/ us-gaap_InvestmentTypeAxis
= cik881453_CommercialMortgageLoansMember		 28,449cik881453_InvestmentIncome
/ us-gaap_InvestmentTypeAxis
= cik881453_CommercialMortgageLoansMember
Policy Loans [Member]      
Schedule of Investment Income, Reported Amounts, by Category [Line Items]      
Gross investment income 739cik881453_InvestmentIncome
/ us-gaap_InvestmentTypeAxis
= us-gaap_PolicyLoansMember		 675cik881453_InvestmentIncome
/ us-gaap_InvestmentTypeAxis
= us-gaap_PolicyLoansMember		 845cik881453_InvestmentIncome
/ us-gaap_InvestmentTypeAxis
= us-gaap_PolicyLoansMember
Short-term Investments [Member]      
Schedule of Investment Income, Reported Amounts, by Category [Line Items]      
Gross investment income 281cik881453_InvestmentIncome
/ us-gaap_InvestmentTypeAxis
= us-gaap_ShortTermInvestmentsMember		 323cik881453_InvestmentIncome
/ us-gaap_InvestmentTypeAxis
= us-gaap_ShortTermInvestmentsMember		 620cik881453_InvestmentIncome
/ us-gaap_InvestmentTypeAxis
= us-gaap_ShortTermInvestmentsMember
Other Long-term Investments [Member]      
Schedule of Investment Income, Reported Amounts, by Category [Line Items]      
Gross investment income $ 6,492cik881453_InvestmentIncome
/ us-gaap_InvestmentTypeAxis
= us-gaap_OtherLongTermInvestmentsMember		 $ 3,601cik881453_InvestmentIncome
/ us-gaap_InvestmentTypeAxis
= us-gaap_OtherLongTermInvestmentsMember		 $ 8,302cik881453_InvestmentIncome
/ us-gaap_InvestmentTypeAxis
= us-gaap_OtherLongTermInvestmentsMember