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Investments (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2022
Jun. 30, 2022
Dec. 31, 2021
Schedule of Available-for-sale Securities [Line Items]      
Additional contractual commitments $ 983,500 $ 983,500  
Contractual commitments, investment period expiration date   2026  
Fixed maturities, available for sale, fair value 12,873,421 $ 12,873,421 $ 12,860,395
Maximum exposure to loss 1,800,000 1,800,000 1,700,000
Commitments to fund investments 800,000 800,000  
Fixed maturities - held to maturity, at amortized cost 71,800 71,800  
Fixed maturities - held to maturity, at amortized cost, net of credit allowances, fair value $ 71,245 71,245  
Fixed maturities - held to maturity, term 5 years    
Fixed maturities - held to maturity, at amortized cost, credit allowances $ 366 366  
Fixed Maturity Securities [Member]      
Schedule of Available-for-sale Securities [Line Items]      
Fair value of investments in unrealized loss position 11,325,407 11,325,407 5,882,136
Gross unrealized losses on investments in unrealized loss position 885,215 885,215 86,129
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Market Value 10,388,190 10,388,190 5,390,316
Fixed maturity securities, duration of unrealized loss, less than 12 months, gross unrealized depreciation 763,375 763,375 70,899
Fixed maturity securities, duration of unrealized loss, greater than 12 months, gross unrealized depreciation 121,840 121,840 15,230
Fixed maturities, available for sale, fair value 12,873,421 $ 12,873,421 $ 12,860,395
Fixed Maturity Securities [Member] | Sales Revenue Net [Member] | Issuer [Member] | Issuer with the second largest unrealized loss position [Member]      
Schedule of Available-for-sale Securities [Line Items]      
Percentage threshold of unrealized losses not exceeded by any one single issuer   2.20% 0.40%
Fixed Maturity Securities [Member] | U S Government Debt 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   4.30% 2.10%
Recorded An Allowance For Credit Losses [Member]      
Schedule of Available-for-sale Securities [Line Items]      
Fair value of investments in unrealized loss position 7,054 $ 7,054 $ 15,700
Gross unrealized losses on investments in unrealized loss position 855 855 400
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Market Value 7,054 7,054  
Fixed maturity securities, duration of unrealized loss, less than 12 months, gross unrealized depreciation 855 855  
Fixed maturity securities, duration of unrealized loss, greater than 12 months, gross unrealized depreciation  
Asset Backed Securities [Member]      
Schedule of Available-for-sale Securities [Line Items]      
Fair value of investments in unrealized loss position 3,527,531 3,527,531 1,928,786
Gross unrealized losses on investments in unrealized loss position 177,890 177,890 11,014
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Market Value 3,518,224 3,518,224 1,890,876
Fixed maturity securities, duration of unrealized loss, less than 12 months, gross unrealized depreciation 177,153 177,153 10,713
Fixed maturity securities, duration of unrealized loss, greater than 12 months, gross unrealized depreciation 737 737 301
Fixed maturities, available for sale, fair value 3,751,371 3,751,371 3,466,286
Fixed maturities - held to maturity, at amortized cost 62,800 62,800  
Fixed maturities - held to maturity, at amortized cost, net of credit allowances, fair value 62,400 62,400  
Fixed maturities - held to maturity, gross unrealized appreciation 100 100  
Fixed maturities - held to maturity, gross unrealized depreciation 200 200  
Corporate Securities [Member]      
Schedule of Available-for-sale Securities [Line Items]      
Fair value of investments in unrealized loss position 3,318,819 3,318,819 1,665,896
Gross unrealized losses on investments in unrealized loss position 336,713 336,713 31,000
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Market Value 2,907,008 2,907,008 1,465,259
Fixed maturity securities, duration of unrealized loss, less than 12 months, gross unrealized depreciation 282,978 282,978 24,853
Fixed maturity securities, duration of unrealized loss, greater than 12 months, gross unrealized depreciation 53,735 53,735 6,147
Fixed maturities, available for sale, fair value 4,007,683 4,007,683 4,074,905
Fixed maturities - held to maturity, at amortized cost 9,000 9,000  
Fixed maturities - held to maturity, at amortized cost, net of credit allowances, fair value 8,800 8,800  
Fixed maturities - held to maturity, gross unrealized appreciation 0 0  
Fixed maturities - held to maturity, gross unrealized depreciation 100 100  
External Credit Rating 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 662,600 662,600 61,500
Fixed maturity securities, duration of unrealized loss, greater than 12 months, gross unrealized depreciation 114,200 114,200 $ 12,300
Private Placement Liquidity Sweep [Member]      
Schedule of Available-for-sale Securities [Line Items]      
Fixed maturities, available for sale, fair value $ 262,300 $ 262,300