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Investments (Schedule of Fixed Maturity Securities) (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
[3]
Debt Securities, Available-for-sale [Line Items]      
Fixed maturity securities, available for sale, amortized cost [1] $ 46,999,183 $ 42,304,736  
Fixed maturity securities, available for sale, gross unrealized gains 4,421,976 5,549,754  
Fixed maturity securities, available for sale, gross unrealized losses [2] (112,370) (250,826)  
Fixed maturity securities, available for sale, allowance for credit losses (2,846) (64,771) $ 0
Fixed maturity securities, available for sale, fair value 51,305,943 47,538,893  
Accrued interest receivable 400,700 377,500  
United States Government Full Faith and Credit      
Debt Securities, Available-for-sale [Line Items]      
Fixed maturity securities, available for sale, amortized cost [1] 37,109 37,471  
Fixed maturity securities, available for sale, gross unrealized gains 718 2,300  
Fixed maturity securities, available for sale, gross unrealized losses [2] (34) 0  
Fixed maturity securities, available for sale, allowance for credit losses 0 0  
Fixed maturity securities, available for sale, fair value 37,793 39,771  
United States Government Sponsored Agencies      
Debt Securities, Available-for-sale [Line Items]      
Fixed maturity securities, available for sale, amortized cost [1] 1,008,920 995,465  
Fixed maturity securities, available for sale, gross unrealized gains 32,123 44,132  
Fixed maturity securities, available for sale, gross unrealized losses [2] (90) (46)  
Fixed maturity securities, available for sale, allowance for credit losses 0 0  
Fixed maturity securities, available for sale, fair value 1,040,953 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] 3,495,563 3,236,767  
Fixed maturity securities, available for sale, gross unrealized gains 437,456 543,252  
Fixed maturity securities, available for sale, gross unrealized losses [2] (3,042) (1,044)  
Fixed maturity securities, available for sale, allowance for credit losses (2,776) (2,844) 0
Fixed maturity securities, available for sale, fair value 3,927,201 3,776,131  
Foreign Government Obligations      
Debt Securities, Available-for-sale [Line Items]      
Fixed maturity securities, available for sale, amortized cost [1] 380,646 177,062  
Fixed maturity securities, available for sale, gross unrealized gains 22,742 25,644  
Fixed maturity securities, available for sale, gross unrealized losses [2] (843) 0  
Fixed maturity securities, available for sale, allowance for credit losses 0 0  
Fixed maturity securities, available for sale, fair value 402,545 202,706  
Corporate Securities      
Debt Securities, Available-for-sale [Line Items]      
Fixed maturity securities, available for sale, amortized cost [1] 31,084,629 26,745,196  
Fixed maturity securities, available for sale, gross unrealized gains 3,614,047 4,507,716  
Fixed maturity securities, available for sale, gross unrealized losses [2] (38,442) (35,892)  
Fixed maturity securities, available for sale, allowance for credit losses 0 (60,193) 0
Fixed maturity securities, available for sale, fair value 34,660,234 31,156,827  
Residential Mortgage Backed Securities      
Debt Securities, Available-for-sale [Line Items]      
Fixed maturity securities, available for sale, amortized cost [1] 1,056,778 1,399,956  
Fixed maturity securities, available for sale, gross unrealized gains 70,434 117,135  
Fixed maturity securities, available for sale, gross unrealized losses [2] (2,093) (2,526)  
Fixed maturity securities, available for sale, allowance for credit losses (70) (1,734) 0
Fixed maturity securities, available for sale, fair value 1,125,049 1,512,831  
Commercial Mortgage Backed Securities      
Debt Securities, Available-for-sale [Line Items]      
Fixed maturity securities, available for sale, amortized cost [1] 4,708,878 4,119,650  
Fixed maturity securities, available for sale, gross unrealized gains 149,152 206,255  
Fixed maturity securities, available for sale, gross unrealized losses [2] (17,719) (64,678)  
Fixed maturity securities, available for sale, allowance for credit losses 0 0 0
Fixed maturity securities, available for sale, fair value 4,840,311 4,261,227  
Other Asset Backed Securities      
Debt Securities, Available-for-sale [Line Items]      
Fixed maturity securities, available for sale, amortized cost [1] 5,226,660 5,593,169  
Fixed maturity securities, available for sale, gross unrealized gains 95,304 103,320  
Fixed maturity securities, available for sale, gross unrealized losses [2] (50,107) (146,640)  
Fixed maturity securities, available for sale, allowance for credit losses 0 0 $ 0
Fixed maturity securities, available for sale, fair value $ 5,271,857 $ 5,549,849  
[1] Amortized cost excludes accrued interest receivable of $400.7 million and $377.5 million as of December 31, 2021 and 2020, respectively.
[2] Gross unrealized losses are net of allowance for credit losses.
[3] The allowance for credit loss associated with available for sale fixed maturity securities was applied prospectively upon adoption of authoritative guidance effective January 1, 2020. See Note 1 - Significant Accounting Policies for further details.