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Investments (Schedule of Fixed Maturity Securities) (Details) - USD ($)
$ in Thousands
Mar. 31, 2023
Dec. 31, 2022
Mar. 31, 2022
Dec. 31, 2021
Debt Securities, Available-for-sale [Line Items]        
Fixed maturity securities, available for sale, amortized cost $ 43,784,431 $ 44,866,019    
Fixed maturity securities, available for sale, gross unrealized gains 307,654 225,792    
Fixed maturity securities, available for sale, gross unrealized losses (4,534,414) (5,283,847)    
Fixed maturity securities, available for sale, allowance for credit losses (2,047) (3,347) $ (6,577) $ (2,846)
Fair Value 39,555,624 39,804,617 [1]    
Accrued interest receivable 425,500 425,400    
U.S. Government and agencies        
Debt Securities, Available-for-sale [Line Items]        
Fixed maturity securities, available for sale, amortized cost 179,026 173,638    
Fixed maturity securities, available for sale, gross unrealized gains 1,060 70    
Fixed maturity securities, available for sale, gross unrealized losses (2,208) (4,637)    
Fixed maturity securities, available for sale, allowance for credit losses 0 0    
Fair Value 177,878 169,071    
States, municipalities and territories        
Debt Securities, Available-for-sale [Line Items]        
Fixed maturity securities, available for sale, amortized cost 4,066,597 4,356,251    
Fixed maturity securities, available for sale, gross unrealized gains 52,221 41,565    
Fixed maturity securities, available for sale, gross unrealized losses (453,102) (574,834)    
Fixed maturity securities, available for sale, allowance for credit losses 0 0 (2,009) (2,776)
Fair Value 3,665,716 3,822,982    
Foreign corporate securities and foreign governments        
Debt Securities, Available-for-sale [Line Items]        
Fixed maturity securities, available for sale, amortized cost 738,759 748,770    
Fixed maturity securities, available for sale, gross unrealized gains 12,943 11,661    
Fixed maturity securities, available for sale, gross unrealized losses (73,869) (83,579)    
Fixed maturity securities, available for sale, allowance for credit losses 0 0    
Fair Value 677,833 676,852    
Corporate securities        
Debt Securities, Available-for-sale [Line Items]        
Fixed maturity securities, available for sale, amortized cost 26,338,901 27,706,440    
Fixed maturity securities, available for sale, gross unrealized gains 195,461 146,065    
Fixed maturity securities, available for sale, gross unrealized losses (3,131,447) (3,687,370)    
Fixed maturity securities, available for sale, allowance for credit losses (1,914) (3,214) (3,825) 0
Fair Value 23,401,001 24,161,921    
Residential mortgage backed securities        
Debt Securities, Available-for-sale [Line Items]        
Fixed maturity securities, available for sale, amortized cost 1,455,263 1,492,242    
Fixed maturity securities, available for sale, gross unrealized gains 9,954 11,870    
Fixed maturity securities, available for sale, gross unrealized losses (109,226) (126,368)    
Fixed maturity securities, available for sale, allowance for credit losses (133) (133) $ (743) $ (70)
Fair Value 1,355,858 1,377,611    
Commercial mortgage backed securities        
Debt Securities, Available-for-sale [Line Items]        
Fixed maturity securities, available for sale, amortized cost 4,088,679 4,098,755    
Fixed maturity securities, available for sale, gross unrealized gains 1,125 493    
Fixed maturity securities, available for sale, gross unrealized losses (412,132) (411,770)    
Fixed maturity securities, available for sale, allowance for credit losses 0 0    
Fair Value 3,677,672 3,687,478    
Other asset backed securities        
Debt Securities, Available-for-sale [Line Items]        
Fixed maturity securities, available for sale, amortized cost 6,917,206 6,289,923    
Fixed maturity securities, available for sale, gross unrealized gains 34,890 14,068    
Fixed maturity securities, available for sale, gross unrealized losses (352,430) (395,289)    
Fixed maturity securities, available for sale, allowance for credit losses 0 0    
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.