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Investments (Gross Unrealized Losses on Investments, By Category and Length of Time) (Details) - USD ($) $ in Thousands		Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021	Jun. 30, 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		$ 31,481,160		$ 5,735,135
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, unrealized losses	[1]	(3,471,595)		(51,758)
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, fair value		1,737,103		2,072,853
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, unrealized losses	[1]	(206,236)		(63,458)
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, fair value		33,218,263		7,807,988
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, unrealized losses	[1]	(3,677,831)		(115,216)
Fixed maturity securities, available for sale, allowance for credit losses		6,187	$ 6,577	2,846	$ 14,190	$ 59,698	$ 64,771
U.S. Government and Agencies
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, fair value		39,342		760,977
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, unrealized losses	[1]	(1,115)		(124)
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		39,342		760,977
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, unrealized losses	[1]	(1,115)		(124)
Fixed maturity securities, available for sale, allowance for credit losses		0		0
States, Municipalities 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		2,492,772		168,942
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, unrealized losses	[1]	(329,239)		(2,468)
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, fair value		20,104		15,711
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, unrealized losses	[1]	(2,756)		(3,350)
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, fair value		2,512,876		184,653
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, unrealized losses	[1]	(331,995)		(5,818)
Fixed maturity securities, available for sale, allowance for credit losses		1,834	2,009	2,776	3,347	2,791	2,844
Foreign Corporate Securities and Foreign Governments
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, fair value		539,487		42,861
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, unrealized losses	[1]	(59,797)		(843)
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, fair value		3,376		0
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, unrealized losses	[1]	(1,914)		0
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, fair value		542,863		42,861
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, unrealized losses	[1]	(61,711)		(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		20,887,402		2,375,603
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, unrealized losses	[1]	(2,624,093)		(30,070)
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, fair value		66,655		116,819
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, unrealized losses	[1]	(26,128)		(8,372)
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, fair value		20,954,057		2,492,422
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, unrealized losses	[1]	(2,650,221)		(38,442)
Fixed maturity securities, available for sale, allowance for credit losses		3,743	3,825	0	10,723	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		882,665		250,964
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, unrealized losses	[1]	(58,688)		(1,408)
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, fair value		32,265		26,917
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, unrealized losses	[1]	(3,271)		(755)
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, fair value		914,930		277,881
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, unrealized losses	[1]	(61,959)		(2,163)
Fixed maturity securities, available for sale, allowance for credit losses		610	$ 743	70	$ 120	$ 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		3,888,178		784,464
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, unrealized losses	[1]	(247,155)		(5,500)
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, fair value		70,629		142,224
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, unrealized losses	[1]	(9,107)		(12,219)
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, fair value		3,958,807		926,688
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, unrealized losses	[1]	(256,262)		(17,719)
Fixed maturity securities, available for sale, allowance for credit losses		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		2,751,314		1,351,324
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, unrealized losses	[1]	(151,508)		(11,345)
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, fair value		1,544,074		1,771,182
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, unrealized losses	[1]	(163,060)		(38,762)
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, fair value		4,295,388		3,122,506
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, unrealized losses	[1]	(314,568)		(50,107)
Fixed maturity securities, available for sale, allowance for credit losses		$ 0		$ 0
[1] Unrealized losses have not been reduced to reflect the allowance for credit losses of $6.2 million and $2.8 million as of June 30, 2022 and December 31, 2021, respectively.

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