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Investments (Fixed Maturity Securities by Contractual Maturity) (Details) - USD ($)
$ in Thousands
Mar. 31, 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 $ 702,112  
Fixed maturity securities, available for sale, due after one year through five years, amortized cost 6,122,055  
Fixed maturity securities, available for sale, due after five years through ten years, amortized cost 6,116,836  
Fixed maturity securities, available for sale, due after ten years through twenty years, amortized cost 8,790,928  
Fixed maturity securities, available for sale, due after twenty years, amortized cost 9,591,352  
Fixed maturity securities, available for sale, securities with a single maturity date, amortized cost 31,323,283  
Amortized Cost 43,784,431 $ 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 696,244  
Fixed maturity securities, available for sale, due after one year through five years, fair value 5,914,199  
Fixed maturity securities, available for sale, due after five years through ten years, fair value 5,639,129  
Fixed maturity securities, available for sale, due after ten years through twenty years, fair value 8,046,303  
Fixed maturity securities, available for sale, due after twenty years, fair value 7,626,553  
Fixed maturity securities, available for sale, securities with a single maturity date, fair value 27,922,428  
Fair Value 39,555,624 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 1,455,263  
Amortized Cost 1,455,263 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 1,355,858  
Fair Value 1,355,858 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 4,088,679  
Amortized Cost 4,088,679 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 3,677,672  
Fair Value 3,677,672 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 6,917,206  
Amortized Cost 6,917,206 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 6,599,666  
Fair Value $ 6,599,666 $ 5,908,702
[1] Certain prior period amounts have been recast. See Note 1 - Significant Accounting Policies for more information.