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Schedule I - Summary of Investments - Other Than Investments in Related Parties (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]
Amortized cost	$ 33,269,706us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesCost	[1]
Amount at which shown in the balance sheet	35,981,858us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesCarryingAmount
Fixed Maturity Securities [Member]
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]
Amortized cost	30,281,478us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesCost / us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesByTypeAxis = us-gaap_FixedMaturitiesMember	[1]
Fair value	32,521,040us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesFairValue / us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesByTypeAxis = us-gaap_FixedMaturitiesMember
Amount at which shown in the balance sheet	32,521,634us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesCarryingAmount / us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesByTypeAxis = us-gaap_FixedMaturitiesMember
Fixed Maturity Securities [Member] | Available For Sale [Member]
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]
Amortized cost	30,205,046us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesCost / us-gaap_InvestmentSecondaryCategorizationAxis = us-gaap_AvailableforsaleSecuritiesMember / us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesByTypeAxis = us-gaap_FixedMaturitiesMember	[1]
Fair value	32,445,202us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesFairValue / us-gaap_InvestmentSecondaryCategorizationAxis = us-gaap_AvailableforsaleSecuritiesMember / us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesByTypeAxis = us-gaap_FixedMaturitiesMember
Amount at which shown in the balance sheet	32,445,202us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesCarryingAmount / us-gaap_InvestmentSecondaryCategorizationAxis = us-gaap_AvailableforsaleSecuritiesMember / us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesByTypeAxis = us-gaap_FixedMaturitiesMember
United States Government Full Faith and Credit [Member] | Available For Sale [Member]
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]
Amortized cost	137,710us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesCost / us-gaap_InvestmentSecondaryCategorizationAxis = us-gaap_AvailableforsaleSecuritiesMember / us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesByTypeAxis = us-gaap_USTreasurySecuritiesMember	[1]
Fair value	138,460us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesFairValue / us-gaap_InvestmentSecondaryCategorizationAxis = us-gaap_AvailableforsaleSecuritiesMember / us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesByTypeAxis = us-gaap_USTreasurySecuritiesMember
Amount at which shown in the balance sheet	138,460us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesCarryingAmount / us-gaap_InvestmentSecondaryCategorizationAxis = us-gaap_AvailableforsaleSecuritiesMember / us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesByTypeAxis = us-gaap_USTreasurySecuritiesMember
United States Government Sponsored Agencies [Member] | Available For Sale [Member]
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]
Amortized cost	1,364,424us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesCost / us-gaap_InvestmentSecondaryCategorizationAxis = us-gaap_AvailableforsaleSecuritiesMember / us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesByTypeAxis = us-gaap_USGovernmentCorporationsAndAgenciesSecuritiesMember	[1]
Fair value	1,393,890us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesFairValue / us-gaap_InvestmentSecondaryCategorizationAxis = us-gaap_AvailableforsaleSecuritiesMember / us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesByTypeAxis = us-gaap_USGovernmentCorporationsAndAgenciesSecuritiesMember
Amount at which shown in the balance sheet	1,393,890us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesCarryingAmount / us-gaap_InvestmentSecondaryCategorizationAxis = us-gaap_AvailableforsaleSecuritiesMember / us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesByTypeAxis = us-gaap_USGovernmentCorporationsAndAgenciesSecuritiesMember
United States Municipalities, States and Territories [Member] | Available For Sale [Member]
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]
Amortized cost	3,293,551us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesCost / us-gaap_InvestmentSecondaryCategorizationAxis = us-gaap_AvailableforsaleSecuritiesMember / us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesByTypeAxis = us-gaap_USStatesAndPoliticalSubdivisionsMember	[1]
Fair value	3,723,309us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesFairValue / us-gaap_InvestmentSecondaryCategorizationAxis = us-gaap_AvailableforsaleSecuritiesMember / us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesByTypeAxis = us-gaap_USStatesAndPoliticalSubdivisionsMember
Amount at which shown in the balance sheet	3,723,309us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesCarryingAmount / us-gaap_InvestmentSecondaryCategorizationAxis = us-gaap_AvailableforsaleSecuritiesMember / us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesByTypeAxis = us-gaap_USStatesAndPoliticalSubdivisionsMember
Foreign Government Obligations [Member] | Available For Sale [Member]
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]
Amortized cost	181,128us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesCost / us-gaap_InvestmentSecondaryCategorizationAxis = us-gaap_AvailableforsaleSecuritiesMember / us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesByTypeAxis = us-gaap_ForeignGovernmentDebtSecuritiesMember	[1]
Fair value	193,803us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesFairValue / us-gaap_InvestmentSecondaryCategorizationAxis = us-gaap_AvailableforsaleSecuritiesMember / us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesByTypeAxis = us-gaap_ForeignGovernmentDebtSecuritiesMember
Amount at which shown in the balance sheet	193,803us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesCarryingAmount / us-gaap_InvestmentSecondaryCategorizationAxis = us-gaap_AvailableforsaleSecuritiesMember / us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesByTypeAxis = us-gaap_ForeignGovernmentDebtSecuritiesMember
Corporate Securities [Member] | Available For Sale [Member]
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]
Amortized cost	19,984,747us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesCost / us-gaap_InvestmentSecondaryCategorizationAxis = us-gaap_AvailableforsaleSecuritiesMember / us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesByTypeAxis = us-gaap_CorporateDebtSecuritiesMember	[1]
Fair value	21,490,292us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesFairValue / us-gaap_InvestmentSecondaryCategorizationAxis = us-gaap_AvailableforsaleSecuritiesMember / us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesByTypeAxis = us-gaap_CorporateDebtSecuritiesMember
Amount at which shown in the balance sheet	21,490,292us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesCarryingAmount / us-gaap_InvestmentSecondaryCategorizationAxis = us-gaap_AvailableforsaleSecuritiesMember / us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesByTypeAxis = us-gaap_CorporateDebtSecuritiesMember
Corporate Securities [Member] | Held For Investment [Member]
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]
Amortized cost	76,432us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesCost / us-gaap_InvestmentSecondaryCategorizationAxis = us-gaap_HeldtomaturitySecuritiesMember / us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesByTypeAxis = us-gaap_CorporateDebtSecuritiesMember	[1]
Fair value	75,838us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesFairValue / us-gaap_InvestmentSecondaryCategorizationAxis = us-gaap_HeldtomaturitySecuritiesMember / us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesByTypeAxis = us-gaap_CorporateDebtSecuritiesMember
Amount at which shown in the balance sheet	76,432us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesCarryingAmount / us-gaap_InvestmentSecondaryCategorizationAxis = us-gaap_HeldtomaturitySecuritiesMember / us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesByTypeAxis = us-gaap_CorporateDebtSecuritiesMember
Residential Mortgage Backed Securities [Member] | Available For Sale [Member]
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]
Amortized cost	1,616,846us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesCost / us-gaap_InvestmentSecondaryCategorizationAxis = us-gaap_AvailableforsaleSecuritiesMember / us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesByTypeAxis = us-gaap_ResidentialMortgageBackedSecuritiesMember	[1]
Fair value	1,751,345us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesFairValue / us-gaap_InvestmentSecondaryCategorizationAxis = us-gaap_AvailableforsaleSecuritiesMember / us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesByTypeAxis = us-gaap_ResidentialMortgageBackedSecuritiesMember
Amount at which shown in the balance sheet	1,751,345us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesCarryingAmount / us-gaap_InvestmentSecondaryCategorizationAxis = us-gaap_AvailableforsaleSecuritiesMember / us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesByTypeAxis = us-gaap_ResidentialMortgageBackedSecuritiesMember
Commercial Mortgage Backed Securities [Member] | Available For Sale [Member]
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]
Amortized cost	2,720,294us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesCost / us-gaap_InvestmentSecondaryCategorizationAxis = us-gaap_AvailableforsaleSecuritiesMember / us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesByTypeAxis = us-gaap_CommercialMortgageBackedSecuritiesMember	[1]
Fair value	2,807,620us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesFairValue / us-gaap_InvestmentSecondaryCategorizationAxis = us-gaap_AvailableforsaleSecuritiesMember / us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesByTypeAxis = us-gaap_CommercialMortgageBackedSecuritiesMember
Amount at which shown in the balance sheet	2,807,620us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesCarryingAmount / us-gaap_InvestmentSecondaryCategorizationAxis = us-gaap_AvailableforsaleSecuritiesMember / us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesByTypeAxis = us-gaap_CommercialMortgageBackedSecuritiesMember
Other Asset Backed Securities [Member] | Available For Sale [Member]
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]
Amortized cost	906,346us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesCost / us-gaap_InvestmentSecondaryCategorizationAxis = us-gaap_AvailableforsaleSecuritiesMember / us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesByTypeAxis = us-gaap_AssetBackedSecuritiesMember	[1]
Fair value	946,483us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesFairValue / us-gaap_InvestmentSecondaryCategorizationAxis = us-gaap_AvailableforsaleSecuritiesMember / us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesByTypeAxis = us-gaap_AssetBackedSecuritiesMember
Amount at which shown in the balance sheet	946,483us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesCarryingAmount / us-gaap_InvestmentSecondaryCategorizationAxis = us-gaap_AvailableforsaleSecuritiesMember / us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesByTypeAxis = us-gaap_AssetBackedSecuritiesMember
Equity Securities [Member] | Available For Sale [Member]
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]
Amortized cost	7,509us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesCost / us-gaap_InvestmentSecondaryCategorizationAxis = us-gaap_AvailableforsaleSecuritiesMember / us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesByTypeAxis = us-gaap_EquitySecuritiesMember	[1]
Fair value	7,805us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesFairValue / us-gaap_InvestmentSecondaryCategorizationAxis = us-gaap_AvailableforsaleSecuritiesMember / us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesByTypeAxis = us-gaap_EquitySecuritiesMember
Amount at which shown in the balance sheet	7,805us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesCarryingAmount / us-gaap_InvestmentSecondaryCategorizationAxis = us-gaap_AvailableforsaleSecuritiesMember / us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesByTypeAxis = us-gaap_EquitySecuritiesMember
Common Stocks [Member] | Available For Sale [Member]
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]
Amortized cost	7,509us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesCost / us-gaap_InvestmentSecondaryCategorizationAxis = us-gaap_AvailableforsaleSecuritiesMember / us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesByTypeAxis = us-gaap_BanksTrustAndInsuranceEquitiesMember	[1]
Fair value	7,805us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesFairValue / us-gaap_InvestmentSecondaryCategorizationAxis = us-gaap_AvailableforsaleSecuritiesMember / us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesByTypeAxis = us-gaap_BanksTrustAndInsuranceEquitiesMember
Amount at which shown in the balance sheet	7,805us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesCarryingAmount / us-gaap_InvestmentSecondaryCategorizationAxis = us-gaap_AvailableforsaleSecuritiesMember / us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesByTypeAxis = us-gaap_BanksTrustAndInsuranceEquitiesMember
Mortgage Loans on Real Estate [Member]
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]
Amortized cost	2,434,580us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesCost / us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesByTypeAxis = us-gaap_MortgageLoansOnRealEstateMember	[1]
Fair value	2,493,901us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesFairValue / us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesByTypeAxis = us-gaap_MortgageLoansOnRealEstateMember
Amount at which shown in the balance sheet	2,434,580us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesCarryingAmount / us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesByTypeAxis = us-gaap_MortgageLoansOnRealEstateMember
Derivative Instruments [Member]
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]
Amortized cost	259,413us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesCost / us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesByTypeAxis = us-gaap_DerivativeFinancialInstrumentsAssetsMember	[1]
Fair value	731,113us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesFairValue / us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesByTypeAxis = us-gaap_DerivativeFinancialInstrumentsAssetsMember
Amount at which shown in the balance sheet	731,113us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesCarryingAmount / us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesByTypeAxis = us-gaap_DerivativeFinancialInstrumentsAssetsMember
Other Investments [Member]
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]
Amortized cost	286,726us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesCost / us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesByTypeAxis = us-gaap_OtherLongTermInvestmentsMember	[1]
Amount at which shown in the balance sheet	$ 286,726us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesCarryingAmount / us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesByTypeAxis = us-gaap_OtherLongTermInvestmentsMember
[1] On the basis of cost adjusted for other than temporary impairments, repayments and amortization of premiums and accrual of discounts for fixed maturity securities and short-term investments, original cost for derivative instruments and unpaid principal balance less allowance for credit losses for mortgage loans.

X

- Definition

This element represents the carrying (reported) amount of the entity's investments as of the balance sheet date. This amount may represent the individual investment's or group of similar investments' original cost, fair value, or such other amount at which the investment is shown in the entity's balance sheet.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 15

-Article 12



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 946

-SubTopic 320

-Section S99

-Paragraph 7

-Subparagraph (SX 210.12-15)

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- Definition

This item represents the original cost of the entity's investments including investments in equity securities and, as to fixed maturities, original cost reduced by repayments and adjusted for amortization of premiums or accrual of discounts.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 15

-Article 12



Reference 2: http://www.xbrl.org/2003/role/presentationRef

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-Topic 946

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- Definition

This item represents the reported amount of the entity's investments measured at fair value. Fair value is the price that would be received to sell an investment in an orderly transaction between market participants at the balance sheet [measurement] date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 15

-Article 12



Reference 2: http://www.xbrl.org/2003/role/presentationRef

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-Name Accounting Standards Codification

-Topic 946

-SubTopic 320

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-Paragraph 7

-Subparagraph (SX 210.12-15)

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