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Investments in Fixed Maturity Securities (The Amortized Cost and Fair Value of Fixed Maturity Securities) (Details) - USD ($)
$ in Thousands
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Investments, Debt and Equity Securities [Abstract]      
Amortized Cost, Due in one year or less $ 1,744,361    
Amortized Cost, Due after one year through five years 9,337,291    
Amortized Cost, Due after five years through ten years 3,966,371    
Amortized Cost, Due after ten years 4,013,827    
Amortized Cost, Mortgage-backed securities 3,949,024    
Total investment in fixed maturity securities, Amortized Cost 23,010,874    
Fair Value, Due in one year or less 1,719,948    
Fair Value, Due after one year through five years 9,059,599    
Fair Value, Due after five years through ten years 3,902,808    
Fair Value, Due after ten years 3,949,220    
Fair Value, Mortgage-backed securities 3,767,851    
Total investments in fixed maturity securities, Fair Value 22,399,426    
Held-to-maturity, allowance for credit loss $ 25 $ 43 $ 114