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Investments (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2022
Dec. 31, 2021
Schedule of Available-for-sale Securities [Line Items]    
Additional contractual commitments $ 2,500,000  
Contractual commitments, investment period expiration date Dec. 31, 2026  
Fixed Maturity Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Aggregate market value of investments in unrealized loss position $ 15,313,053 $ 9,334,952
Gross unrealized losses on investments in unrealized loss position 806,752 203,130
Fixed maturity securities, duration of unrealized loss, less than 12 months, gross unrealized depreciation 597,201 127,800
Fixed maturity securities, duration of unrealized loss, greater than 12 months, gross unrealized depreciation 209,551 75,330
Market Value $ 21,998,415 $ 22,308,272
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 0.90% 0.50%
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 4.00% 2.70%
Recorded an Allowance for Credit Losses [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Aggregate market value of investments in unrealized loss position $ 18,830 $ 15,700
Gross unrealized losses on investments in unrealized loss position 1,092 400
Fixed maturity securities, duration of unrealized loss, less than 12 months, gross unrealized depreciation 1,092  
Fixed maturity securities, duration of unrealized loss, greater than 12 months, gross unrealized depreciation  
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 551,400 116,200
Fixed maturity securities, duration of unrealized loss, greater than 12 months, gross unrealized depreciation 201,800 72,300
Private Placement Liquidity Sweep [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Market Value 773,300  
Maximum exposure to loss 2,900,000 $ 2,900,000
Commitments to fund investments $ 2,200,000