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Investments (Gross Unrealized Losses on Investments, By Category and Length of Time) (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Jun. 30, 2023	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 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	$ 5,100,241		$ 28,557,796
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, unrealized losses	(268,091)		(4,403,539)
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, fair value	23,734,655		4,221,422
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, unrealized losses	(5,534,806)		(880,308)
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, fair value	28,834,896		32,779,218
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, unrealized losses	(5,802,897)		(5,283,847)
Fixed maturity securities, available for sale, allowance for credit losses	3,618	$ 4,146	3,347	$ 4,920	$ 6,187	$ 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	116,484		160,201
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, unrealized losses	(6,223)		(4,512)
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, fair value	45,991		908
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, unrealized losses	(3,549)		(125)
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, fair value	162,475		161,109
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, unrealized losses	(9,772)		(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	229,082		2,595,122
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, unrealized losses	(19,688)		(537,313)
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, fair value	2,168,957		95,184
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, unrealized losses	(618,782)		(37,521)
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, fair value	2,398,039		2,690,306
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, unrealized losses	(638,470)		(574,834)
Fixed maturity securities, available for sale, allowance for credit losses	0	0	0	0	1,834	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	14,610		522,826
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, unrealized losses	(70)		(76,957)
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, fair value	393,715		21,816
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, unrealized losses	(106,748)		(6,622)
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, fair value	408,325		544,642
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, unrealized losses	(106,818)		(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	2,888,535		18,784,181
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, unrealized losses	(163,562)		(3,218,323)
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, fair value	14,312,197		1,411,177
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, unrealized losses	(3,938,910)		(469,047)
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, fair value	17,200,732		20,195,358
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, unrealized losses	(4,102,472)		(3,687,370)
Fixed maturity securities, available for sale, allowance for credit losses	2,911	3,132	3,214	3,214	3,743	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	487,935		992,783
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, unrealized losses	(25,263)		(101,100)
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, fair value	772,581		116,388
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, unrealized losses	(137,886)		(25,268)
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, fair value	1,260,516		1,109,171
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, unrealized losses	(163,149)		(126,368)
Fixed maturity securities, available for sale, allowance for credit losses	97	67	133	1,706	610	70
Commercial Mortgage-Backed Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, fair value	181,256		2,941,293
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, unrealized losses	(7,607)		(302,513)
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, fair value	2,734,129		651,923
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, unrealized losses	(530,639)		(109,257)
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, fair value	2,915,385		3,593,216
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, unrealized losses	(538,246)		(411,770)
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	1,182,339		2,561,390
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, unrealized losses	(45,678)		(162,821)
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, fair value	3,307,085		1,924,026
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, unrealized losses	(198,292)		(232,468)
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, fair value	4,489,424		4,485,416
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, unrealized losses	(243,970)		(395,289)
Fixed maturity securities, available for sale, allowance for credit losses	$ 610	$ 947	$ 0	$ 0	$ 0	$ 0