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Schedule I - Summary of Investments - Other Than Investments in Related Parties (Details) $ in Thousands | Dec. 31, 2019 USD ($)
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SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |  |
Amortized cost | $ 52,592,203 | [1]
Amount at which shown in the balance sheet | 56,877,573 |
Total Fixed Maturity Securities |  |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |  |
Amortized cost | 48,238,946 | [1]
Fair value | 51,580,490 |
Amount at which shown in the balance sheet | 51,580,490 |
United States Government Full Faith and Credit |  |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |  |
Amortized cost | 161,492 | [1]
Fair value | 161,765 |
Amount at which shown in the balance sheet | 161,765 |
United States Government Sponsored Agencies |  |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |  |
Amortized cost | 601,672 | [1]
Fair value | 625,020 |
Amount at which shown in the balance sheet | 625,020 |
United States Municipalities, States and Territories |  |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |  |
Amortized cost | 4,147,343 | [1]
Fair value | 4,527,671 |
Amount at which shown in the balance sheet | 4,527,671 |
Foreign Government Obligations |  |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |  |
Amortized cost | 186,993 | [1]
Fair value | 205,096 |
Amount at which shown in the balance sheet | 205,096 |
Corporate Securities |  |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |  |
Amortized cost | 29,822,172 | [1]
Fair value | 32,536,839 |
Amount at which shown in the balance sheet | 32,536,839 |
Residential Mortgage Backed Securities |  |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |  |
Amortized cost | 1,477,738 | [1]
Fair value | 1,575,664 |
Amount at which shown in the balance sheet | 1,575,664 |
Commercial Mortgage Backed Securities |  |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |  |
Amortized cost | 5,591,167 | [1]
Fair value | 5,786,279 |
Amount at which shown in the balance sheet | 5,786,279 |
Other Asset Backed Securities |  |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |  |
Amortized cost | 6,250,369 | [1]
Fair value | 6,162,156 |
Amount at which shown in the balance sheet | 6,162,156 |
Mortgage Loans on Real Estate |  |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |  |
Amortized cost | 3,448,793 | [1]
Fair value | 3,536,446 |
Amount at which shown in the balance sheet | 3,448,793 |
Derivative Instruments |  |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |  |
Amortized cost | 412,163 | [1]
Fair value | 1,355,989 |
Amount at which shown in the balance sheet | 1,355,989 |
Other Investments |  |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |  |
Amortized cost | 492,301 | [1]
Amount at which shown in the balance sheet | $ 492,301 |
[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.

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