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Investments (Gross Unrealized Losses on Investments, By Category and Length of Time) (Details) - USD ($) $ in Thousands		Sep. 30, 2022	Jun. 30, 2022	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 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		$ 33,142,745		$ 5,735,135
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, unrealized losses	[1]	(5,396,279)		(51,758)
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, fair value		1,594,124		2,072,853
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, unrealized losses	[1]	(283,408)		(63,458)
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, fair value		34,736,869		7,807,988
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, unrealized losses	[1]	(5,679,687)		(115,216)
Fixed maturity securities, available for sale, allowance for credit losses		4,920	$ 6,187	2,846	$ 4,074	$ 14,190	$ 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		132,334		760,977
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, unrealized losses	[1]	(3,538)		(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		132,334		760,977
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, unrealized losses	[1]	(3,538)		(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		2,890,984		168,942
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, unrealized losses	[1]	(556,773)		(2,468)
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, fair value		2,572		15,711
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, unrealized losses	[1]	(1,226)		(3,350)
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, fair value		2,893,556		184,653
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, unrealized losses	[1]	(557,999)		(5,818)
Fixed maturity securities, available for sale, allowance for credit losses		0	1,834	2,776	2,772	3,347	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		634,949		42,861
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, unrealized losses	[1]	(96,583)		(843)
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, fair value		3,163		0
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, unrealized losses	[1]	(2,123)		0
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, fair value		638,112		42,861
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, unrealized losses	[1]	(98,706)		(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		22,263,446		2,375,603
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, unrealized losses	[1]	(4,055,115)		(30,070)
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, fair value		94,985		116,819
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, unrealized losses	[1]	(39,901)		(8,372)
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, fair value		22,358,431		2,492,422
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, unrealized losses	[1]	(4,095,016)		(38,442)
Fixed maturity securities, available for sale, allowance for credit losses		3,214	3,743	0	1,006	10,723	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		1,080,905		250,964
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, unrealized losses	[1]	(102,854)		(1,408)
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, fair value		37,416		26,917
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, unrealized losses	[1]	(6,232)		(755)
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, fair value		1,118,321		277,881
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, unrealized losses	[1]	(109,086)		(2,163)
Fixed maturity securities, available for sale, allowance for credit losses		1,706	$ 610	70	$ 296	$ 120	$ 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		3,562,772		784,464
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, unrealized losses	[1]	(361,686)		(5,500)
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, fair value		42,624		142,224
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, unrealized losses	[1]	(8,949)		(12,219)
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, fair value		3,605,396		926,688
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, unrealized losses	[1]	(370,635)		(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		2,577,355		1,351,324
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, unrealized losses	[1]	(219,730)		(11,345)
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, fair value		1,413,364		1,771,182
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, unrealized losses	[1]	(224,977)		(38,762)
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, fair value		3,990,719		3,122,506
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, unrealized losses	[1]	(444,707)		(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 $4.9 million and $2.8 million as of September 30, 2022 and December 31, 2021, respectively.

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