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Schedule I - Summary of Investments - Other Than Investments in Related Parties (Details)
$ in Thousands
Dec. 31, 2023
USD ($)
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.