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Investments (Gross Unrealized Losses on Investments, By Category and Length of Time) (Details) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Debt Securities, Available-for-sale [Line Items]      
Available for sale, continuous unrealized loss position, less than 12 months, fair value $ 5,327,830 $ 28,557,796  
Available for sale, continuous unrealized loss position, less than 12 months, unrealized losses (389,277) (4,403,539)  
Available for sale, continuous unrealized loss position, 12 months or more, fair value 22,724,213 4,221,422  
Available for sale, continuous unrealized loss position, 12 months or more, unrealized losses (3,601,562) (880,308)  
Available for sale, continuous unrealized loss position, total, fair value 28,052,043 32,779,218  
Available for sale, continuous unrealized loss position, total, unrealized losses (3,990,839) (5,283,847)  
Fixed maturity securities, available for sale, allowance for credit losses 4,030 3,347 $ 2,846
U.S. Government and agencies      
Debt Securities, Available-for-sale [Line Items]      
Available for sale, continuous unrealized loss position, less than 12 months, fair value 55,087 160,201  
Available for sale, continuous unrealized loss position, less than 12 months, unrealized losses (279) (4,512)  
Available for sale, continuous unrealized loss position, 12 months or more, fair value 47,639 908  
Available for sale, continuous unrealized loss position, 12 months or more, unrealized losses (1,869) (125)  
Available for sale, continuous unrealized loss position, total, fair value 102,726 161,109  
Available for sale, continuous unrealized loss position, total, unrealized losses (2,148) (4,637)  
Fixed maturity securities, available for sale, allowance for credit losses 0 0  
States, municipalities and territories      
Debt Securities, Available-for-sale [Line Items]      
Available for sale, continuous unrealized loss position, less than 12 months, fair value 451,091 2,595,122  
Available for sale, continuous unrealized loss position, less than 12 months, unrealized losses (44,832) (537,313)  
Available for sale, continuous unrealized loss position, 12 months or more, fair value 2,290,704 95,184  
Available for sale, continuous unrealized loss position, 12 months or more, unrealized losses (528,276) (37,521)  
Available for sale, continuous unrealized loss position, total, fair value 2,741,795 2,690,306  
Available for sale, continuous unrealized loss position, total, unrealized losses (573,108) (574,834)  
Fixed maturity securities, available for sale, allowance for credit losses 0 0 2,776
Foreign corporate securities and foreign governments      
Debt Securities, Available-for-sale [Line Items]      
Available for sale, continuous unrealized loss position, less than 12 months, fair value 1,555 522,826  
Available for sale, continuous unrealized loss position, less than 12 months, unrealized losses (195) (76,957)  
Available for sale, continuous unrealized loss position, 12 months or more, fair value 427,021 21,816  
Available for sale, continuous unrealized loss position, 12 months or more, unrealized losses (71,625) (6,622)  
Available for sale, continuous unrealized loss position, total, fair value 428,576 544,642  
Available for sale, continuous unrealized loss position, total, unrealized losses (71,820) (83,579)  
Fixed maturity securities, available for sale, allowance for credit losses 0 0  
Corporate securities      
Debt Securities, Available-for-sale [Line Items]      
Available for sale, continuous unrealized loss position, less than 12 months, fair value 3,275,031 18,784,181  
Available for sale, continuous unrealized loss position, less than 12 months, unrealized losses (237,744) (3,218,323)  
Available for sale, continuous unrealized loss position, 12 months or more, fair value 13,625,542 1,411,177  
Available for sale, continuous unrealized loss position, 12 months or more, unrealized losses (2,367,304) (469,047)  
Available for sale, continuous unrealized loss position, total, fair value 16,900,573 20,195,358  
Available for sale, continuous unrealized loss position, total, unrealized losses (2,605,048) (3,687,370)  
Fixed maturity securities, available for sale, allowance for credit losses 3,412 3,214 0
Residential mortgage backed securities      
Debt Securities, Available-for-sale [Line Items]      
Available for sale, continuous unrealized loss position, less than 12 months, fair value 145,093 992,783  
Available for sale, continuous unrealized loss position, less than 12 months, unrealized losses (7,614) (101,100)  
Available for sale, continuous unrealized loss position, 12 months or more, fair value 858,821 116,388  
Available for sale, continuous unrealized loss position, 12 months or more, unrealized losses (105,122) (25,268)  
Available for sale, continuous unrealized loss position, total, fair value 1,003,914 1,109,171  
Available for sale, continuous unrealized loss position, total, unrealized losses (112,736) (126,368)  
Fixed maturity securities, available for sale, allowance for credit losses 0 133 70
Commercial mortgage backed securities      
Debt Securities, Available-for-sale [Line Items]      
Available for sale, continuous unrealized loss position, less than 12 months, fair value 431,947 2,941,293  
Available for sale, continuous unrealized loss position, less than 12 months, unrealized losses (69,007) (302,513)  
Available for sale, continuous unrealized loss position, 12 months or more, fair value 2,416,868 651,923  
Available for sale, continuous unrealized loss position, 12 months or more, unrealized losses (385,088) (109,257)  
Available for sale, continuous unrealized loss position, total, fair value 2,848,815 3,593,216  
Available for sale, continuous unrealized loss position, total, unrealized losses (454,095) (411,770)  
Fixed maturity securities, available for sale, allowance for credit losses 0 0  
Other asset backed securities      
Debt Securities, Available-for-sale [Line Items]      
Available for sale, continuous unrealized loss position, less than 12 months, fair value 968,026 2,561,390  
Available for sale, continuous unrealized loss position, less than 12 months, unrealized losses (29,606) (162,821)  
Available for sale, continuous unrealized loss position, 12 months or more, fair value 3,057,618 1,924,026  
Available for sale, continuous unrealized loss position, 12 months or more, unrealized losses (142,278) (232,468)  
Available for sale, continuous unrealized loss position, total, fair value 4,025,644 4,485,416  
Available for sale, continuous unrealized loss position, total, unrealized losses (171,884) (395,289)  
Fixed maturity securities, available for sale, allowance for credit losses $ 618 $ 0 $ 0