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Schedule I - Summary of Investments - Other Than Investments in Related Parties (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]  
Amortized cost $ 29,631,142 [1]
Amount at which shown in the balance sheet 30,346,654
Fixed Maturity Securities [Member]
  
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]  
Amortized cost 26,603,985 [1]
Fair value 26,671,287
Amount at which shown in the balance sheet 26,686,702
Fixed Maturity Securities [Member] | Available For Sale [Member]
  
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]  
Amortized cost 26,527,730 [1]
Fair value 26,610,447
Amount at which shown in the balance sheet 26,610,447
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 44,852 [1]
Fair value 42,925
Amount at which shown in the balance sheet 42,925
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 1,313,776 [1]
Fair value 1,194,289
Amount at which shown in the balance sheet 1,194,289
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 3,181,032 [1]
Fair value 3,306,743
Amount at which shown in the balance sheet 3,306,743
Foreign Government Obligations [Member] | Available For Sale [Member]
  
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]  
Amortized cost 86,112 [1]
Fair value 91,557
Amount at which shown in the balance sheet 91,557
Corporate Securities [Member] | Available For Sale [Member]
  
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]  
Amortized cost 17,142,118 [1]
Fair value 17,233,037
Amount at which shown in the balance sheet 17,233,037
Corporate Securities [Member] | Held For Investment [Member]
  
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]  
Amortized cost 76,255 [1]
Fair value 60,840
Amount at which shown in the balance sheet 76,255
Residential Mortgage Backed Securities [Member] | Available For Sale [Member]
  
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]  
Amortized cost 1,895,913 [1]
Fair value 1,971,960
Amount at which shown in the balance sheet 1,971,960
Commercial Mortgage Backed Securities [Member] | Available For Sale [Member]
  
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]  
Amortized cost 1,821,988 [1]
Fair value 1,735,460
Amount at which shown in the balance sheet 1,735,460
Other Asset Backed Securities [Member] | Available For Sale [Member]
  
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]  
Amortized cost 1,041,939 [1]
Fair value 1,034,476
Amount at which shown in the balance sheet 1,034,476
Equity Securities [Member] | Available For Sale [Member]
  
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]  
Amortized cost 7,503 [1]
Fair value 7,778
Amount at which shown in the balance sheet 7,778
Common Stocks [Member] | Available For Sale [Member]
  
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]  
Amortized cost 7,503 [1]
Fair value 7,778
Amount at which shown in the balance sheet 7,778
Mortgage Loans on Real Estate [Member]
  
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]  
Amortized cost 2,581,082 [1]
Fair value 2,615,410
Amount at which shown in the balance sheet 2,581,082
Derivative Instruments [Member]
  
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]  
Amortized cost 223,530 [1]
Fair value 856,050
Amount at which shown in the balance sheet 856,050
Other Investments [Member]
  
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]  
Amortized cost 215,042 [1]
Amount at which shown in the balance sheet $ 215,042
[1] On the basis of cost adjusted for 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.