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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

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