XML 54 R43.htm IDEA: XBRL DOCUMENT v3.24.1.1.u2
Investments (Gross Unrealized Losses on Investments, By Category and Length of Time) (Details) - USD ($)
$ in Thousands
Mar. 31, 2024
Dec. 31, 2023
Mar. 31, 2023
Dec. 31, 2022
Debt Securities, Available-for-sale [Line Items]        
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, fair value $ 2,954,082 $ 5,327,830    
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, unrealized losses (109,107) (389,277)    
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, fair value 22,360,901 22,724,213    
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, unrealized losses (4,021,249) (3,601,562)    
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, fair value 25,314,983 28,052,043    
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, unrealized losses (4,130,356) (3,990,839)    
Fixed maturity securities, available for sale, allowance for credit losses 3,518 4,030 $ 2,047 $ 3,347
U.S. Government and agencies        
Debt Securities, Available-for-sale [Line Items]        
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, fair value 3,990 55,087    
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, unrealized losses (20) (279)    
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, fair value 22,732 47,639    
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, unrealized losses (1,210) (1,869)    
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, fair value 26,722 102,726    
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, unrealized losses (1,230) (2,148)    
Fixed maturity securities, available for sale, allowance for credit losses 0 0    
States, municipalities and territories        
Debt Securities, Available-for-sale [Line Items]        
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, fair value 114,901 451,091    
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, unrealized losses (10,035) (44,832)    
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, fair value 2,522,955 2,290,704    
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, unrealized losses (574,959) (528,276)    
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, fair value 2,637,856 2,741,795    
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, unrealized losses (584,994) (573,108)    
Fixed maturity securities, available for sale, allowance for credit losses 0 0    
Foreign corporate securities and foreign governments        
Debt Securities, Available-for-sale [Line Items]        
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, fair value 17,385 1,555    
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, unrealized losses (92) (195)    
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, fair value 382,787 427,021    
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, unrealized losses (80,842) (71,625)    
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, fair value 400,172 428,576    
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, unrealized losses (80,934) (71,820)    
Fixed maturity securities, available for sale, allowance for credit losses 0 0    
Corporate securities        
Debt Securities, Available-for-sale [Line Items]        
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, fair value 1,280,454 3,275,031    
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, unrealized losses (34,771) (237,744)    
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, fair value 14,276,990 13,625,542    
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, unrealized losses (2,774,173) (2,367,304)    
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, fair value 15,557,444 16,900,573    
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, unrealized losses (2,808,944) (2,605,048)    
Fixed maturity securities, available for sale, allowance for credit losses 3,293 3,412 1,914 3,214
Residential mortgage backed securities        
Debt Securities, Available-for-sale [Line Items]        
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, fair value 51,291 145,093    
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, unrealized losses (836) (7,614)    
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, fair value 653,903 858,821    
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, unrealized losses (106,897) (105,122)    
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, fair value 705,194 1,003,914    
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, unrealized losses (107,733) (112,736)    
Fixed maturity securities, available for sale, allowance for credit losses 0 0 133 133
Commercial mortgage backed securities        
Debt Securities, Available-for-sale [Line Items]        
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, fair value 55,259 431,947    
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, unrealized losses (1,517) (69,007)    
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, fair value 2,497,882 2,416,868    
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, unrealized losses (388,854) (385,088)    
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, fair value 2,553,141 2,848,815    
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, unrealized losses (390,371) (454,095)    
Fixed maturity securities, available for sale, allowance for credit losses 0 0    
Other asset backed securities        
Debt Securities, Available-for-sale [Line Items]        
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, fair value 1,430,802 968,026    
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, unrealized losses (61,836) (29,606)    
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, fair value 2,003,652 3,057,618    
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, unrealized losses (94,314) (142,278)    
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, fair value 3,434,454 4,025,644    
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, unrealized losses (156,150) (171,884)    
Fixed maturity securities, available for sale, allowance for credit losses $ 225 $ 618 $ 0 $ 0