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Investments and Derivative Instruments Level 4 Concentration of Credit Risk (Details) (USD $)
Dec. 31, 2014
Dec. 31, 2013
Verizon Communications Inc. [Member] | Corporate Debt Securities [Member]    
Concentration of Credit Risk [Line Items]    
Largest Exposure by Issuer, Percent of Invested Assets 1.00%hlic_LargestExposurebyIssuerPercentofInvestedAssets
/ invest_InvestmentIssuerAxis
= hlic_VerizonCommunicationsInc.Member
/ us-gaap_InvestmentTypeAxis
= us-gaap_CorporateDebtSecuritiesMember
 
JAPAN | Foreign Government Debt Securities [Member]    
Concentration of Credit Risk [Line Items]    
Fair Value, Concentration of Risk, Investments $ 853,000,000us-gaap_FairValueConcentrationOfRiskInvestments
/ invest_InvestmentIssuerAxis
= country_JP
/ us-gaap_InvestmentTypeAxis
= us-gaap_ForeignGovernmentDebtSecuritiesMember
 
Percentage of Stockholders' Equity to Credit Concentration Risk 10.00%hlic_FairValueConcentrationofRiskInvestmentsPercentofStockholdersEquity
/ invest_InvestmentIssuerAxis
= country_JP
/ us-gaap_InvestmentTypeAxis
= us-gaap_ForeignGovernmentDebtSecuritiesMember
 
Fair Value, Concentration of Risk, Investments, Percent of Invested Assets 2.00%hlic_FairValueConcentrationofRiskInvestmentsPercentofInvestedAssets
/ invest_InvestmentIssuerAxis
= country_JP
/ us-gaap_InvestmentTypeAxis
= us-gaap_ForeignGovernmentDebtSecuritiesMember
 
Largest Exposure by Issuer, Percent of Invested Assets   3.00%hlic_LargestExposurebyIssuerPercentofInvestedAssets
/ invest_InvestmentIssuerAxis
= country_JP
/ us-gaap_InvestmentTypeAxis
= us-gaap_ForeignGovernmentDebtSecuritiesMember
HSBC-X UNITED KINGDOM [Member] | Foreign Corporate Debt Securities [Member]    
Concentration of Credit Risk [Line Items]    
Largest Exposure by Issuer, Percent of Invested Assets 1.00%hlic_LargestExposurebyIssuerPercentofInvestedAssets
/ invest_InvestmentIssuerAxis
= exch_HSXE
/ us-gaap_InvestmentTypeAxis
= us-gaap_ForeignCorporateDebtSecuritiesMember
 
BANK OF AMERICA - MERRILL LYNCH ATS [Member] | Corporate Debt Securities [Member]    
Concentration of Credit Risk [Line Items]    
Largest Exposure by Issuer, Percent of Invested Assets 1.00%hlic_LargestExposurebyIssuerPercentofInvestedAssets
/ invest_InvestmentIssuerAxis
= exch_BAML
/ us-gaap_InvestmentTypeAxis
= us-gaap_CorporateDebtSecuritiesMember
 
J.P. Morgan Chase [Member] | Corporate Debt Securities [Member]    
Concentration of Credit Risk [Line Items]    
Largest Exposure by Issuer, Percent of Invested Assets   3.00%hlic_LargestExposurebyIssuerPercentofInvestedAssets
/ invest_InvestmentIssuerAxis
= hlic_J.P.MorganChaseMember
/ us-gaap_InvestmentTypeAxis
= us-gaap_CorporateDebtSecuritiesMember
GOLDMAN SACH MTF [Member] | Corporate Debt Securities [Member]    
Concentration of Credit Risk [Line Items]    
Largest Exposure by Issuer, Percent of Invested Assets   3.00%hlic_LargestExposurebyIssuerPercentofInvestedAssets
/ invest_InvestmentIssuerAxis
= exch_SGMA
/ us-gaap_InvestmentTypeAxis
= us-gaap_CorporateDebtSecuritiesMember
Financial Services [Member] | Corporate Debt Securities [Member]    
Concentration of Credit Risk [Line Items]    
Largest Exposure by Sector, Percent of Invested Assets 9.00%hlic_LargestExposurebySectorPercentofInvestedAssets
/ invest_InvestmentSectorAxis
= hlic_FinancialServicesMember
/ us-gaap_InvestmentTypeAxis
= us-gaap_CorporateDebtSecuritiesMember
8.00%hlic_LargestExposurebySectorPercentofInvestedAssets
/ invest_InvestmentSectorAxis
= hlic_FinancialServicesMember
/ us-gaap_InvestmentTypeAxis
= us-gaap_CorporateDebtSecuritiesMember
Public Utility, Bonds [Member] | Corporate Debt Securities [Member]    
Concentration of Credit Risk [Line Items]    
Largest Exposure by Sector, Percent of Invested Assets 8.00%hlic_LargestExposurebySectorPercentofInvestedAssets
/ invest_InvestmentSectorAxis
= us-gaap_PublicUtilityBondsMember
/ us-gaap_InvestmentTypeAxis
= us-gaap_CorporateDebtSecuritiesMember
9.00%hlic_LargestExposurebySectorPercentofInvestedAssets
/ invest_InvestmentSectorAxis
= us-gaap_PublicUtilityBondsMember
/ us-gaap_InvestmentTypeAxis
= us-gaap_CorporateDebtSecuritiesMember
Consumer Non-cyclical [Member] | Corporate Debt Securities [Member]    
Concentration of Credit Risk [Line Items]    
Largest Exposure by Sector, Percent of Invested Assets 7.00%hlic_LargestExposurebySectorPercentofInvestedAssets
/ invest_InvestmentSectorAxis
= hlic_ConsumerNoncyclicalMember
/ us-gaap_InvestmentTypeAxis
= us-gaap_CorporateDebtSecuritiesMember
 
Commercial Real Estate [Member] | Corporate Debt Securities [Member]    
Concentration of Credit Risk [Line Items]    
Largest Exposure by Sector, Percent of Invested Assets   7.00%hlic_LargestExposurebySectorPercentofInvestedAssets
/ invest_InvestmentSectorAxis
= us-gaap_CommercialRealEstateMember
/ us-gaap_InvestmentTypeAxis
= us-gaap_CorporateDebtSecuritiesMember