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Schedule I - Summary of Investments - Other Than Investments in Related Parties (Details) $ in Thousands | Dec. 31, 2023 USD ($)
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SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |  |
Amortized cost | $ 51,330,530 | [1]
Amount at which shown in the balance sheet | 48,227,024 |
Total Fixed Maturity Securities |  |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |  |
Amortized cost | 38,537,462 | [1]
Fair value | 34,780,482 |
Amount at which shown in the balance sheet | 34,780,482 |
U.S. Government and agencies |  |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |  |
Amortized cost | 172,683 | [1]
Fair value | 171,141 |
Amount at which shown in the balance sheet | 171,141 |
States, municipalities and territories |  |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |  |
Amortized cost | 3,654,571 | [1]
Fair value | 3,098,940 |
Amount at which shown in the balance sheet | 3,098,940 |
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 | 563,890 | [1]
Fair value | 493,739 |
Amount at which shown in the balance sheet | 493,739 |
Corporate securities |  |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |  |
Amortized cost | 23,036,862 | [1]
Fair value | 20,603,416 |
Amount at which shown in the balance sheet | 20,603,416 |
Residential mortgage backed securities |  |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |  |
Amortized cost | 1,503,639 | [1]
Fair value | 1,402,501 |
Amount at which shown in the balance sheet | 1,402,501 |
Commercial mortgage backed securities |  |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |  |
Amortized cost | 3,405,647 | [1]
Fair value | 2,952,547 |
Amount at which shown in the balance sheet | 2,952,547 |
Other asset backed securities |  |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |  |
Amortized cost | 6,200,170 | [1]
Fair value | 6,058,198 |
Amount at which shown in the balance sheet | 6,058,198 |
Mortgage loans on real estate |  |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |  |
Amortized cost | 7,537,594 | [1]
Fair value | 7,047,993 |
Amount at which shown in the balance sheet | 7,537,594 |
Real estate investments |  |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |  |
Amortized cost | 1,368,275 | [1]
Fair value | 1,334,247 |
Amount at which shown in the balance sheet | 1,334,247 |
Derivative instruments |  |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |  |
Amortized cost | 522,387 | [1]
Fair value | 1,207,288 |
Amount at which shown in the balance sheet | 1,207,288 |
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 | 1,089,591 | [1]
Amount at which shown in the balance sheet | 1,089,591 |
Other investments |  |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |  |
Amortized cost | 2,275,221 | [1]
Amount at which shown in the balance sheet | $ 2,277,822 |
[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, original cost reduced by pro rata amortization for derivative instruments and original cost adjusted for equity in earnings and distributions for limited partnerships and limited liability companies.

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