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Investments (Fixed Maturity Securities by Contractual Maturity) (Details) - USD ($)
$ in Thousands
Mar. 31, 2024
Dec. 31, 2023
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis [Abstract]    
Fixed maturity securities, available for sale, due in one year or less, amortized cost $ 635,069  
Fixed maturity securities, available for sale, due after one year through five years, amortized cost 5,295,239  
Fixed maturity securities, available for sale, due after five years through ten years, amortized cost 4,174,379  
Fixed maturity securities, available for sale, due after ten years through twenty years, amortized cost 7,149,272  
Fixed maturity securities, available for sale, due after twenty years, amortized cost 8,632,830  
Fixed maturity securities, available for sale, securities with a single maturity date, amortized cost 25,886,789  
Amortized Cost 36,009,821 $ 38,537,462
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract]    
Fixed maturity securities, available for sale, due in one year or less, fair value 628,657  
Fixed maturity securities, available for sale, due after one year through five years, fair value 5,166,955  
Fixed maturity securities, available for sale, due after five years through ten years, fair value 3,788,971  
Fixed maturity securities, available for sale, due after ten years through twenty years, fair value 6,209,035  
Fixed maturity securities, available for sale, due after twenty years, fair value 6,748,289  
Fixed maturity securities, available for sale, securities with a single maturity date, fair value 22,541,907  
Fair Value 32,044,379 34,780,482
Residential mortgage backed securities    
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis [Abstract]    
Fixed maturity securities, available for sale, securities without a single maturity date, amortized cost 1,093,654  
Amortized Cost 1,093,654 1,503,639
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract]    
Fixed maturity securities, available for sale, securities without a single maturity date, fair value 995,130  
Fair Value 995,130 1,402,501
Commercial mortgage backed securities    
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis [Abstract]    
Fixed maturity securities, available for sale, securities without a single maturity date, amortized cost 3,121,755  
Amortized Cost 3,121,755 3,405,647
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract]    
Fixed maturity securities, available for sale, securities without a single maturity date, fair value 2,734,085  
Fair Value 2,734,085 2,952,547
Other asset backed securities    
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis [Abstract]    
Fixed maturity securities, available for sale, securities without a single maturity date, amortized cost 5,907,623  
Amortized Cost 5,907,623 6,200,170
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract]    
Fixed maturity securities, available for sale, securities without a single maturity date, fair value 5,773,257  
Fair Value $ 5,773,257 $ 6,058,198