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Investments (Fixed Maturity Securities by Contractual Maturity) (Details) - USD ($)
$ in Thousands
Jun. 30, 2023
Dec. 31, 2022
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis [Abstract]    
Fixed maturity securities, available for sale, due in one year or less, amortized cost $ 681,287  
Fixed maturity securities, available for sale, due after one year through five years, amortized cost 6,111,532  
Fixed maturity securities, available for sale, due after five years through ten years, amortized cost 5,588,456  
Fixed maturity securities, available for sale, due after ten years through twenty years, amortized cost 8,060,065  
Fixed maturity securities, available for sale, due after twenty years, amortized cost 9,361,757  
Fixed maturity securities, available for sale, securities with a single maturity date, amortized cost 29,803,097  
Amortized Cost 43,323,015 $ 44,866,019
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract]    
Fixed maturity securities, available for sale, due in one year or less, fair value 668,827  
Fixed maturity securities, available for sale, due after one year through five years, fair value 5,857,320  
Fixed maturity securities, available for sale, due after five years through ten years, fair value 5,069,920  
Fixed maturity securities, available for sale, due after ten years through twenty years, fair value 7,137,892  
Fixed maturity securities, available for sale, due after twenty years, fair value 7,345,988  
Fixed maturity securities, available for sale, securities with a single maturity date, fair value 26,079,947  
Fair Value 38,680,457 39,804,617 [1]
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 1,593,824  
Amortized Cost 1,593,824 1,492,242
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract]    
Fixed maturity securities, available for sale, securities without a single maturity date, fair value 1,473,297  
Fair Value 1,473,297 1,377,611
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 4,041,901  
Amortized Cost 4,041,901 4,098,755
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract]    
Fixed maturity securities, available for sale, securities without a single maturity date, fair value 3,553,618  
Fair Value 3,553,618 3,687,478
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 7,884,193  
Amortized Cost 7,884,193 6,289,923
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract]    
Fixed maturity securities, available for sale, securities without a single maturity date, fair value 7,573,595  
Fair Value $ 7,573,595 $ 5,908,702
[1] Certain prior period amounts have been recast. See Note 1 - Significant Accounting Policies for more information.