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Schedule I - Summary of Investments - Other Than Investments in Related Parties (Details) $ in Thousands | Dec. 31, 2022 USD ($)
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SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |  |
Amortized cost | $ 56,378,635 | [1]
Amount at which shown in the balance sheet | 51,325,298 |
Total Fixed Maturity Securities |  |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |  |
Amortized cost | 44,866,019 | [1]
Fair value | 39,804,617 |
Amount at which shown in the balance sheet | 39,804,617 |
U.S. Government and agencies |  |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |  |
Amortized cost | 173,638 | [1]
Fair value | 169,071 |
Amount at which shown in the balance sheet | 169,071 |
States, municipalities and territories |  |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |  |
Amortized cost | 4,356,251 | [1]
Fair value | 3,822,982 |
Amount at which shown in the balance sheet | 3,822,982 |
Foreign corporate securities and foreign governments |  |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |  |
Amortized cost | 748,770 | [1]
Fair value | 676,852 |
Amount at which shown in the balance sheet | 676,852 |
Corporate securities |  |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |  |
Amortized cost | 27,706,440 | [1]
Fair value | 24,161,921 |
Amount at which shown in the balance sheet | 24,161,921 |
Residential mortgage backed securities |  |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |  |
Amortized cost | 1,492,242 | [1]
Fair value | 1,377,611 |
Amount at which shown in the balance sheet | 1,377,611 |
Commercial mortgage backed securities |  |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |  |
Amortized cost | 4,098,755 | [1]
Fair value | 3,687,478 |
Amount at which shown in the balance sheet | 3,687,478 |
Other asset backed securities |  |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |  |
Amortized cost | 6,289,923 | [1]
Fair value | 5,908,702 |
Amount at which shown in the balance sheet | 5,908,702 |
Mortgage loans on real estate |  |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |  |
Amortized cost | 6,949,027 | [1]
Fair value | 6,502,463 |
Amount at which shown in the balance sheet | 6,949,027 |
Real estate investments |  |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |  |
Amortized cost | 1,053,569 | [1]
Fair value | 1,056,063 |
Amount at which shown in the balance sheet | 1,056,063 |
Derivative instruments |  |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |  |
Amortized cost | 425,097 | [1]
Fair value | 431,727 |
Amount at which shown in the balance sheet | 431,727 |
Limited partnerships and limited liability companies |  |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |  |
Amortized cost | 1,266,779 | [1]
Amount at which shown in the balance sheet | 1,266,779 |
Other investments |  |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |  |
Amortized cost | 1,818,144 | [1]
Amount at which shown in the balance sheet | $ 1,817,085 |
[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, unpaid principal balance less allowance for credit losses for mortgage loans, original cost reduced by impairments and/or depreciation for real estate investments, amortized cost for derivative instruments and original cost adjusted for equity in earnings and distributions for limited partnerships and limited liability companies.

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