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Investments (Schedule of Fixed Maturity Securities) (Details) - USD ($)
$ in Thousands
Jun. 30, 2023
Mar. 31, 2023
Dec. 31, 2022
Jun. 30, 2022
Mar. 31, 2022
Dec. 31, 2021
Debt Securities, Available-for-sale [Line Items]            
Fixed maturity securities, available for sale, amortized cost $ 43,323,015   $ 44,866,019      
Fixed maturity securities, available for sale, gross unrealized gains 174,149   225,792      
Fixed maturity securities, available for sale, gross unrealized losses (4,812,561)   (5,283,847)      
Fixed maturity securities, available for sale, allowance for credit losses (4,146) $ (2,047) (3,347) $ (6,187) $ (6,577) $ (2,846)
Fair Value 38,680,457   39,804,617 [1]      
Accrued interest receivable 416,500   425,400      
U.S. Government and agencies            
Debt Securities, Available-for-sale [Line Items]            
Fixed maturity securities, available for sale, amortized cost 179,087   173,638      
Fixed maturity securities, available for sale, gross unrealized gains 66   70      
Fixed maturity securities, available for sale, gross unrealized losses (3,691)   (4,637)      
Fixed maturity securities, available for sale, allowance for credit losses 0   0      
Fair Value 175,462   169,071      
States, municipalities and territories            
Debt Securities, Available-for-sale [Line Items]            
Fixed maturity securities, available for sale, amortized cost 3,706,837   4,356,251      
Fixed maturity securities, available for sale, gross unrealized gains 25,316   41,565      
Fixed maturity securities, available for sale, gross unrealized losses (470,794)   (574,834)      
Fixed maturity securities, available for sale, allowance for credit losses 0 0 0 (1,834) (2,009) (2,776)
Fair Value 3,261,359   3,822,982      
Foreign corporate securities and foreign governments            
Debt Securities, Available-for-sale [Line Items]            
Fixed maturity securities, available for sale, amortized cost 649,101   748,770      
Fixed maturity securities, available for sale, gross unrealized gains 3,491   11,661      
Fixed maturity securities, available for sale, gross unrealized losses (78,675)   (83,579)      
Fixed maturity securities, available for sale, allowance for credit losses 0   0      
Fair Value 573,917   676,852      
Corporate securities            
Debt Securities, Available-for-sale [Line Items]            
Fixed maturity securities, available for sale, amortized cost 25,268,072   27,706,440      
Fixed maturity securities, available for sale, gross unrealized gains 123,687   146,065      
Fixed maturity securities, available for sale, gross unrealized losses (3,319,418)   (3,687,370)      
Fixed maturity securities, available for sale, allowance for credit losses (3,132) (1,914) (3,214) (3,743) (3,825) 0
Fair Value 22,069,209   24,161,921      
Residential mortgage backed securities            
Debt Securities, Available-for-sale [Line Items]            
Fixed maturity securities, available for sale, amortized cost 1,593,824   1,492,242      
Fixed maturity securities, available for sale, gross unrealized gains 7,650   11,870      
Fixed maturity securities, available for sale, gross unrealized losses (128,110)   (126,368)      
Fixed maturity securities, available for sale, allowance for credit losses (67) (133) (133) (610) (743) (70)
Fair Value 1,473,297   1,377,611      
Commercial mortgage backed securities            
Debt Securities, Available-for-sale [Line Items]            
Fixed maturity securities, available for sale, amortized cost 4,041,901   4,098,755      
Fixed maturity securities, available for sale, gross unrealized gains 609   493      
Fixed maturity securities, available for sale, gross unrealized losses (488,892)   (411,770)      
Fixed maturity securities, available for sale, allowance for credit losses 0 0 0 0 0 0
Fair Value 3,553,618   3,687,478      
Other asset backed securities            
Debt Securities, Available-for-sale [Line Items]            
Fixed maturity securities, available for sale, amortized cost 7,884,193   6,289,923      
Fixed maturity securities, available for sale, gross unrealized gains 13,330   14,068      
Fixed maturity securities, available for sale, gross unrealized losses (322,981)   (395,289)      
Fixed maturity securities, available for sale, allowance for credit losses (947) $ 0 0 $ 0 $ 0 $ 0
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.