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Investments (Narrative) (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2021 | Dec. 31, 2020
Schedule of Available-for-sale Securities [Line Items] |  |
Additional contractual commitments | $ 1,413,543,000 |
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 | $ 4,810,714,000 | $ 2,678,449,000
Gross unrealized losses on investments in unrealized loss position | 193,453,000 | 124,812,000
Fixed maturity securities, duration of unrealized loss, less than 12 months, gross unrealized depreciation | 136,941,000 | 67,958,000
Fixed maturity securities, duration of unrealized loss, greater than 12 months, gross unrealized depreciation | 56,512,000 | 56,854,000
Market value of investments | $ 20,407,480,000 | $ 20,040,173,000
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 | 0.10% | 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 | 1.30% | 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 | $ 130,331,000 | $ 63,424,000
Fixed maturity securities, duration of unrealized loss, greater than 12 months, gross unrealized depreciation | 38,150,000 | 33,533,000
Sub-prime and Alt-A Loans [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Gross unrealized depreciation | 0 | $ 0
Private Placement Liquidity Sweep [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Market value of investments | $ 734,888,000 |

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