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Investments (Schedule of Fixed Maturity Securities) (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Jun. 30, 2021
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Dec. 31, 2019
Debt Securities, Available-for-sale [Line Items]            
Fixed maturity securities, available for sale, amortized cost [1] $ 41,247,540   $ 42,304,736      
Fixed maturity securities, available for sale, gross unrealized gains 4,582,602   5,549,754      
Fixed maturity securities, available for sale, gross unrealized losses [2] (87,971)   (250,826)      
Fixed maturity securities, available for sale, allowance for credit losses (4,074) $ (14,190) (64,771) $ (61,619) $ (50,186) $ 0
Fixed maturity securities, available for sale, fair value 45,738,097   47,538,893      
Accrued interest receivable 388,400   377,500      
United States Government Full Faith and Credit            
Debt Securities, Available-for-sale [Line Items]            
Fixed maturity securities, available for sale, amortized cost [1] 37,112   37,471      
Fixed maturity securities, available for sale, gross unrealized gains 1,398   2,300      
Fixed maturity securities, available for sale, gross unrealized losses [2] (24)   0      
Fixed maturity securities, available for sale, allowance for credit losses 0   0      
Fixed maturity securities, available for sale, fair value 38,486   39,771      
United States Government Sponsored Agencies            
Debt Securities, Available-for-sale [Line Items]            
Fixed maturity securities, available for sale, amortized cost [1] 1,008,980   995,465      
Fixed maturity securities, available for sale, gross unrealized gains 34,371   44,132      
Fixed maturity securities, available for sale, gross unrealized losses [2] 0   (46)      
Fixed maturity securities, available for sale, allowance for credit losses 0   0      
Fixed maturity securities, available for sale, fair value 1,043,351   1,039,551      
United States Municipalities, States and Territories            
Debt Securities, Available-for-sale [Line Items]            
Fixed maturity securities, available for sale, amortized cost [1] 3,142,857   3,236,767      
Fixed maturity securities, available for sale, gross unrealized gains 457,359   543,252      
Fixed maturity securities, available for sale, gross unrealized losses [2] (1,188)   (1,044)      
Fixed maturity securities, available for sale, allowance for credit losses (2,772) (3,347) (2,844) 0 0 0
Fixed maturity securities, available for sale, fair value 3,596,256   3,776,131      
Foreign Government Obligations            
Debt Securities, Available-for-sale [Line Items]            
Fixed maturity securities, available for sale, amortized cost [1] 177,101   177,062      
Fixed maturity securities, available for sale, gross unrealized gains 18,240   25,644      
Fixed maturity securities, available for sale, gross unrealized losses [2] 0   0      
Fixed maturity securities, available for sale, allowance for credit losses 0   0      
Fixed maturity securities, available for sale, fair value 195,341   202,706      
Corporate Securities            
Debt Securities, Available-for-sale [Line Items]            
Fixed maturity securities, available for sale, amortized cost [1] 27,342,408   26,745,196      
Fixed maturity securities, available for sale, gross unrealized gains 3,695,003   4,507,716      
Fixed maturity securities, available for sale, gross unrealized losses [2] (14,518)   (35,892)      
Fixed maturity securities, available for sale, allowance for credit losses (1,006) (10,723) (60,193) (53,045) (46,749) 0
Fixed maturity securities, available for sale, fair value 31,021,887   31,156,827      
Residential Mortgage Backed Securities            
Debt Securities, Available-for-sale [Line Items]            
Fixed maturity securities, available for sale, amortized cost [1] 980,838   1,399,956      
Fixed maturity securities, available for sale, gross unrealized gains 75,599   117,135      
Fixed maturity securities, available for sale, gross unrealized losses [2] (2,158)   (2,526)      
Fixed maturity securities, available for sale, allowance for credit losses (296) (120) (1,734) (1,221) (777) 0
Fixed maturity securities, available for sale, fair value 1,053,983   1,512,831      
Commercial Mortgage Backed Securities            
Debt Securities, Available-for-sale [Line Items]            
Fixed maturity securities, available for sale, amortized cost [1] 3,963,733   4,119,650      
Fixed maturity securities, available for sale, gross unrealized gains 197,750   206,255      
Fixed maturity securities, available for sale, gross unrealized losses [2] (23,405)   (64,678)      
Fixed maturity securities, available for sale, allowance for credit losses 0 0 0 (7,353) (2,660) 0
Fixed maturity securities, available for sale, fair value 4,138,078   4,261,227      
Other Asset Backed Securities            
Debt Securities, Available-for-sale [Line Items]            
Fixed maturity securities, available for sale, amortized cost [1] 4,594,511   5,593,169      
Fixed maturity securities, available for sale, gross unrealized gains 102,882   103,320      
Fixed maturity securities, available for sale, gross unrealized losses [2] (46,678)   (146,640)      
Fixed maturity securities, available for sale, allowance for credit losses 0 $ 0 0 $ 0 $ 0 $ 0
Fixed maturity securities, available for sale, fair value $ 4,650,715   $ 5,549,849      
[1] Amortized cost excludes accrued interest receivable of $388.4 million and $377.5 million as of September 30, 2021 and December 31, 2020, respectively.
[2] Gross unrealized losses are net of allowance for credit losses.