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Investments (Narrative) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Schedule of Available-for-sale Securities [Line Items]    
Aggregate market value of investments in unrealized loss position $ 9,334,952 $ 2,678,449
Gross unrealized losses on investments in unrealized loss position 203,130 124,812
Fixed maturity securities, duration of unrealized loss, less than 12 months, gross unrealized depreciation 127,800 67,958
Fixed maturity securities, duration of unrealized loss, greater than 12 months, gross unrealized depreciation 75,330 56,854
Additional contractual commitments $ 2,300  
Contractual commitments, investment period expiration date Dec. 31, 2026  
Maximum exposure to loss $ 2,900,000 2,000,000
Commitments to fund investments 2,100,000  
Securities, carrying value 1,500,000  
Recorded an Allowance for Credit Losses [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Aggregate market value of investments in unrealized loss position 15,700 300
Gross unrealized losses on investments in unrealized loss position 400 100
Fixed Maturity Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Aggregate market value of investments in unrealized loss position 9,334,952 2,678,449
Gross unrealized losses on investments in unrealized loss position 203,130 124,812
Fixed maturity securities, duration of unrealized loss, less than 12 months, gross unrealized depreciation 127,800 67,958
Fixed maturity securities, duration of unrealized loss, greater than 12 months, gross unrealized depreciation $ 75,330 $ 56,854
Fixed Maturity Securities [Member] | Sales Revenue, Net [Member] | Issuer with the second the largest unrealized loss position [Member] | Issuer [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Percentage threshold of unrealized losses not exceeded by any one single issuer 0.50% 0.10%
Fixed Maturity Securities [Member] | US Government Securities [Member] | Sales Revenue, Net [Member] | Issuer [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Percentage threshold of unrealized losses not exceeded by any one single issuer 2.70% 0.70%
Investment Grade [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Fixed maturity securities, duration of unrealized loss, less than 12 months, gross unrealized depreciation $ 116,200 $ 63,400
Fixed maturity securities, duration of unrealized loss, greater than 12 months, gross unrealized depreciation $ 72,300 $ 33,500