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Investments and Derivative Instruments Level 4 Equity Method Investments (Details) (USD $)
3 Months Ended 12 Months Ended
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Schedule of Equity Method Investments [Line Items]                      
Equity Method Investments $ 1,300,000,000us-gaap_EquityMethodInvestments               $ 1,300,000,000us-gaap_EquityMethodInvestments    
Assets 191,775,000,000us-gaap_Assets       202,715,000,000us-gaap_Assets       191,775,000,000us-gaap_Assets 202,715,000,000us-gaap_Assets  
Liabilities 182,484,000,000us-gaap_Liabilities       194,476,000,000us-gaap_Liabilities       182,484,000,000us-gaap_Liabilities 194,476,000,000us-gaap_Liabilities  
Net Investment Income                 1,543,000,000us-gaap_NetInvestmentIncome 1,683,000,000us-gaap_NetInvestmentIncome 2,536,000,000us-gaap_NetInvestmentIncome
Net Income (Loss) Attributable to Parent 132,000,000us-gaap_NetIncomeLoss 88,000,000us-gaap_NetIncomeLoss 400,000,000us-gaap_NetIncomeLoss 56,000,000us-gaap_NetIncomeLoss (81,000,000)us-gaap_NetIncomeLoss 201,000,000us-gaap_NetIncomeLoss (35,000,000)us-gaap_NetIncomeLoss 380,000,000us-gaap_NetIncomeLoss 676,000,000us-gaap_NetIncomeLoss 465,000,000us-gaap_NetIncomeLoss 554,000,000us-gaap_NetIncomeLoss
Limited Partner [Member]                      
Schedule of Equity Method Investments [Line Items]                      
Outstanding Commitments to Fund Limited Partnership and Other Alternative Investments 220,000,000hlic_OutstandingCommitmentsToFundLimitedPartnershipAndOtherAlternativeInvestments
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_LimitedPartnerMember
              220,000,000hlic_OutstandingCommitmentsToFundLimitedPartnershipAndOtherAlternativeInvestments
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_LimitedPartnerMember
   
Aggregate Investment Loss Percentage of Company's Pre Tax Consolidated Net Income Minimum                 10.00%hlic_AggregateInvestmentLossPercentageOfCompanysPreTaxConsolidatedNetIncomeMinimum
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_LimitedPartnerMember
   
Assets 72,000,000,000us-gaap_Assets
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_LimitedPartnerMember
      77,200,000,000us-gaap_Assets
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_LimitedPartnerMember
      72,000,000,000us-gaap_Assets
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_LimitedPartnerMember
77,200,000,000us-gaap_Assets
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_LimitedPartnerMember
 
Liabilities 9,000,000,000us-gaap_Liabilities
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_LimitedPartnerMember
      10,700,000,000us-gaap_Liabilities
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_LimitedPartnerMember
      9,000,000,000us-gaap_Liabilities
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_LimitedPartnerMember
10,700,000,000us-gaap_Liabilities
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_LimitedPartnerMember
 
Net Investment Income                 3,500,000,000us-gaap_NetInvestmentIncome
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_LimitedPartnerMember
1,800,000,000us-gaap_NetInvestmentIncome
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_LimitedPartnerMember
900,000,000us-gaap_NetInvestmentIncome
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_LimitedPartnerMember
Net Income (Loss) Attributable to Parent                 $ 8,700,000,000us-gaap_NetIncomeLoss
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_LimitedPartnerMember
$ 7,100,000,000us-gaap_NetIncomeLoss
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_LimitedPartnerMember
$ 6,500,000,000us-gaap_NetIncomeLoss
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_LimitedPartnerMember