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Investments (Gross Unrealized Losses on Investments, By Category and Length of Time) (Details) - USD ($) $ in Thousands		Mar. 31, 2022	Dec. 31, 2021	Mar. 31, 2021	Dec. 31, 2020
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, fair value		$ 20,483,651	$ 5,735,135
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, unrealized losses	[1]	(1,267,155)	(51,758)
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, fair value		2,002,636	2,072,853
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, unrealized losses	[1]	(107,147)	(63,458)
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, fair value		22,486,287	7,807,988
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, unrealized losses	[1]	(1,374,302)	(115,216)
Fixed maturity securities, available for sale, allowance for credit losses		6,577	2,846	$ 59,698	$ 64,771
United States Government Full Faith and Credit
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, fair value		27,565	1,007
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, unrealized losses	[1]	(686)	(34)
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, fair value		434	0
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, unrealized losses	[1]	(38)	0
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, fair value		27,999	1,007
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, unrealized losses	[1]	(724)	(34)
Fixed maturity securities, available for sale, allowance for credit losses		0	0
United States Government Sponsored Agencies
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, fair value		11,468	759,970
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, unrealized losses	[1]	(2,224)	(90)
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, fair value		0	0
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, unrealized losses	[1]	0	0
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, fair value		11,468	759,970
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, unrealized losses	[1]	(2,224)	(90)
Fixed maturity securities, available for sale, allowance for credit losses		0	0
United States Municipalities, States and Territories
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, fair value		1,161,530	168,942
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, unrealized losses	[1]	(94,117)	(2,468)
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, fair value		18,344	15,711
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, unrealized losses	[1]	(2,505)	(3,350)
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, fair value		1,179,874	184,653
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, unrealized losses	[1]	(96,622)	(5,818)
Fixed maturity securities, available for sale, allowance for credit losses		2,009	2,776	2,791	2,844
Foreign Government Obligations
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, fair value		252,267	42,861
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, unrealized losses	[1]	(21,236)	(843)
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, fair value		0	0
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, unrealized losses	[1]	0	0
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, fair value		252,267	42,861
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, unrealized losses	[1]	(21,236)	(843)
Fixed maturity securities, available for sale, allowance for credit losses		0	0
Corporate Securities
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, fair value		12,808,738	2,375,603
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, unrealized losses	[1]	(965,862)	(30,070)
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, fair value		131,098	116,819
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, unrealized losses	[1]	(22,033)	(8,372)
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, fair value		12,939,836	2,492,422
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, unrealized losses	[1]	(987,895)	(38,442)
Fixed maturity securities, available for sale, allowance for credit losses		3,825	0	55,715	60,193
Residential Mortgage Backed Securities
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, fair value		501,285	250,964
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, unrealized losses	[1]	(21,186)	(1,408)
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, fair value		32,665	26,917
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, unrealized losses	[1]	(2,379)	(755)
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, fair value		533,950	277,881
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, unrealized losses	[1]	(23,565)	(2,163)
Fixed maturity securities, available for sale, allowance for credit losses		743	70	1,192	1,734
Commercial Mortgage Backed Securities
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, fair value		3,217,274	784,464
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, unrealized losses	[1]	(111,459)	(5,500)
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, fair value		88,148	142,224
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, unrealized losses	[1]	(15,992)	(12,219)
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, fair value		3,305,422	926,688
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, unrealized losses	[1]	(127,451)	(17,719)
Fixed maturity securities, available for sale, allowance for credit losses		0	0	0	0
Other Asset Backed Securities
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, fair value		2,503,524	1,351,324
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, unrealized losses	[1]	(50,385)	(11,345)
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, fair value		1,731,947	1,771,182
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, unrealized losses	[1]	(64,200)	(38,762)
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, fair value		4,235,471	3,122,506
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, unrealized losses	[1]	(114,585)	(50,107)
Fixed maturity securities, available for sale, allowance for credit losses		$ 0	$ 0	$ 0	$ 0
[1] Unrealized losses have not been reduced to reflect the allowance for credit losses of $6.6 million and $2.8 million as of March 31, 2022 and December 31, 2021, respectively.

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Amount of allowance for credit loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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