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Investments (Net Investment Income) (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Schedule of Investment Income, Reported Amounts, by Category [Line Items]      
Gross investment income $ 38,989cik881453_InvestmentIncome   $ 45,948cik881453_InvestmentIncome
Less: investment expenses (1,400)cik881453_InvestmentExpenses   (1,447)cik881453_InvestmentExpenses
Net Investment Income, Total 37,589us-gaap_NetInvestmentIncome 44,501us-gaap_NetInvestmentIncome 44,501us-gaap_NetInvestmentIncome
Available For Sale Fixed Maturities [Member]      
Schedule of Investment Income, Reported Amounts, by Category [Line Items]      
Gross investment income 30,782cik881453_InvestmentIncome
/ us-gaap_InvestmentTypeAxis
= cik881453_AvailableForSaleFixedMaturitiesMember		   38,376cik881453_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
Trading Account Assets [Member]      
Schedule of Investment Income, Reported Amounts, by Category [Line Items]      
Gross investment income 2cik881453_InvestmentIncome
/ us-gaap_InvestmentTypeAxis
= us-gaap_TradingAccountAssetsMember		   9cik881453_InvestmentIncome
/ us-gaap_InvestmentTypeAxis
= us-gaap_TradingAccountAssetsMember
Commercial Mortgage Loans [Member]      
Schedule of Investment Income, Reported Amounts, by Category [Line Items]      
Gross investment income 5,236cik881453_InvestmentIncome
/ us-gaap_InvestmentTypeAxis
= cik881453_CommercialMortgageLoansMember		   6,166cik881453_InvestmentIncome
/ us-gaap_InvestmentTypeAxis
= cik881453_CommercialMortgageLoansMember
Policy Loans [Member]      
Schedule of Investment Income, Reported Amounts, by Category [Line Items]      
Gross investment income 130cik881453_InvestmentIncome
/ us-gaap_InvestmentTypeAxis
= us-gaap_PolicyLoansMember		   127cik881453_InvestmentIncome
/ us-gaap_InvestmentTypeAxis
= us-gaap_PolicyLoansMember
Short-term Investments [Member]      
Schedule of Investment Income, Reported Amounts, by Category [Line Items]      
Gross investment income 44cik881453_InvestmentIncome
/ us-gaap_InvestmentTypeAxis
= us-gaap_ShortTermInvestmentsMember		   57cik881453_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 $ 2,795cik881453_InvestmentIncome
/ us-gaap_InvestmentTypeAxis
= us-gaap_OtherLongTermInvestmentsMember		   $ 1,213cik881453_InvestmentIncome
/ us-gaap_InvestmentTypeAxis
= us-gaap_OtherLongTermInvestmentsMember