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Investments (Gross Unrealized Losses on Investments, By Category and Length of Time) (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, fair value	$ 8,523,336		$ 28,557,796
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, unrealized losses	(394,109)		(4,403,539)
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, fair value	23,800,571		4,221,422
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, unrealized losses	(4,418,452)		(880,308)
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, fair value	32,323,907		32,779,218
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, unrealized losses	(4,812,561)		(5,283,847)
Fixed maturity securities, available for sale, allowance for credit losses	4,146	$ 2,047	3,347	$ 6,187	$ 6,577	$ 2,846
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	120,241		160,201
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, unrealized losses	(2,104)		(4,512)
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, fair value	24,084		908
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, unrealized losses	(1,587)		(125)
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, fair value	144,325		161,109
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, unrealized losses	(3,691)		(4,637)
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	545,909		2,595,122
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, unrealized losses	(38,329)		(537,313)
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, fair value	2,077,644		95,184
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, unrealized losses	(432,465)		(37,521)
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, fair value	2,623,553		2,690,306
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, unrealized losses	(470,794)		(574,834)
Fixed maturity securities, available for sale, allowance for credit losses	0	0	0	1,834	2,009	2,776
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	86,734		522,826
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, unrealized losses	(4,892)		(76,957)
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, fair value	404,826		21,816
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, unrealized losses	(73,783)		(6,622)
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, fair value	491,560		544,642
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, unrealized losses	(78,675)		(83,579)
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	4,341,434		18,784,181
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, unrealized losses	(232,048)		(3,218,323)
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, fair value	14,300,847		1,411,177
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, unrealized losses	(3,087,370)		(469,047)
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, fair value	18,642,281		20,195,358
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, unrealized losses	(3,319,418)		(3,687,370)
Fixed maturity securities, available for sale, allowance for credit losses	3,132	1,914	3,214	3,743	3,825	0
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	845,456		992,783
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, unrealized losses	(50,133)		(101,100)
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, fair value	463,440		116,388
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, unrealized losses	(77,977)		(25,268)
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, fair value	1,308,896		1,109,171
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, unrealized losses	(128,110)		(126,368)
Fixed maturity securities, available for sale, allowance for credit losses	67	133	133	610	743	70
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	573,518		2,941,293
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, unrealized losses	(18,089)		(302,513)
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, fair value	2,888,442		651,923
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, unrealized losses	(470,803)		(109,257)
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, fair value	3,461,960		3,593,216
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, unrealized losses	(488,892)		(411,770)
Fixed maturity securities, available for sale, allowance for credit losses	0	0	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	2,010,044		2,561,390
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, unrealized losses	(48,514)		(162,821)
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, fair value	3,641,288		1,924,026
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, unrealized losses	(274,467)		(232,468)
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, fair value	5,651,332		4,485,416
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, unrealized losses	(322,981)		(395,289)
Fixed maturity securities, available for sale, allowance for credit losses	$ 947	$ 0	$ 0	$ 0	$ 0	$ 0