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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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