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Investments (Narrative) (Details) $ in Thousands | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2022 USD ($) Item | Dec. 31, 2021 USD ($) Item
Schedule of Available-for-sale Securities [Line Items] |  |
Fixed maturities - held to maturity, at amortized cost | $ 71,800 |
Fixed maturities - held to maturity, at amortized cost, net of credit allowances, fair value | $ 71,245 |
Fixed maturities - held to maturity, term | 5 years |
Fixed maturities - held to maturity, at amortized cost, credit allowances | $ 366 |
Additional contractual commitments | $ 2,400,000 |
Contractual commitments, investment period expiration date | Dec. 31, 2026 |
Fixed maturity securities - available for sale | $ 21,880,443 | $ 22,308,272
Number of securities held as primary beneficiary | Item | 0 | 0
Fixed Maturity Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Aggregate market value of investments in unrealized loss position | $ 18,937,916 | $ 9,334,952
Gross unrealized losses on investments in unrealized loss position | 1,565,593 | 203,130
Fixed maturity securities, duration of unrealized loss, less than 12 months, gross unrealized depreciation | 1,251,844 | 127,800
Fixed maturity securities, duration of unrealized loss, greater than 12 months, gross unrealized depreciation | 313,749 | 75,330
Fixed maturity securities - available for sale | $ 21,880,443 | $ 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 | 1.30% | 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 | 5.30% | 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 | $ 7,213 | $ 15,700
Gross unrealized losses on investments in unrealized loss position | 1,089 | 400
Fixed maturity securities, duration of unrealized loss, less than 12 months, gross unrealized depreciation | 1,089 |
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] |  |
Fixed maturities - held to maturity, at amortized cost | 62,800 |
Fixed maturities - held to maturity, at amortized cost, net of credit allowances, fair value | 62,400 |
Fixed maturities - held to maturity, gross unrealized appreciation | 100 |
Fixed maturities - held to maturity, gross unrealized depreciation | 200 |
Aggregate market value of investments in unrealized loss position | 3,665,811 | 1,995,902
Gross unrealized losses on investments in unrealized loss position | 183,241 | 11,848
Fixed maturity securities, duration of unrealized loss, less than 12 months, gross unrealized depreciation | 180,189 | 11,180
Fixed maturity securities, duration of unrealized loss, greater than 12 months, gross unrealized depreciation | 3,052 | 668
Fixed maturity securities - available for sale | 3,898,679 | 3,581,729
Corporate Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fixed maturities - held to maturity, at amortized cost | 9,000 |
Fixed maturities - held to maturity, at amortized cost, net of credit allowances, fair value | 8,800 |
Fixed maturities - held to maturity, gross unrealized appreciation | 0 |
Fixed maturities - held to maturity, gross unrealized depreciation | 100 |
Aggregate market value of investments in unrealized loss position | 5,691,086 | 2,605,407
Gross unrealized losses on investments in unrealized loss position | 524,182 | 62,580
Fixed maturity securities, duration of unrealized loss, less than 12 months, gross unrealized depreciation | 420,055 | 38,316
Fixed maturity securities, duration of unrealized loss, greater than 12 months, gross unrealized depreciation | 104,127 | 24,264
Fixed maturity securities - available for sale | 6,986,777 | 7,556,898
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 | 1,100,000 | 116,200
Fixed maturity securities, duration of unrealized loss, greater than 12 months, gross unrealized depreciation | 300,600 | 72,300
Private Placement Liquidity Sweep [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fixed maturity securities - available for sale | 377,700 |
Maximum exposure to loss | 3,100,000 | $ 2,900,000
Commitments to fund investments | $ 2,200,000 |

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