Investments (Gross Unrealized Losses on Investments, By Category and Length of Time) (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 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	$ 16,310,155	$ 28,557,796
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, unrealized losses	(1,534,478)	(4,403,539)
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, fair value	15,059,743	4,221,422
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, unrealized losses	(2,999,936)	(880,308)
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, fair value	31,369,898	32,779,218
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, unrealized losses	(4,534,414)	(5,283,847)
Fixed maturity securities, available for sale, allowance for credit losses	2,047	3,347	$ 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	40,919	160,201
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, unrealized losses	(905)	(4,512)
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, fair value	22,400	908
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, unrealized losses	(1,303)	(125)
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, fair value	63,319	161,109
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, unrealized losses	(2,208)	(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	1,487,593	2,595,122
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, unrealized losses	(160,979)	(537,313)
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, fair value	1,128,425	95,184
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, unrealized losses	(292,123)	(37,521)
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, fair value	2,616,018	2,690,306
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, unrealized losses	(453,102)	(574,834)
Fixed maturity securities, available for sale, allowance for credit losses	0	0	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	372,316	522,826
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, unrealized losses	(26,076)	(76,957)
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, fair value	159,696	21,816
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, unrealized losses	(47,793)	(6,622)
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, fair value	532,012	544,642
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, unrealized losses	(73,869)	(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	10,860,843	18,784,181
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, unrealized losses	(1,149,693)	(3,218,323)
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, fair value	7,844,602	1,411,177
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, unrealized losses	(1,981,754)	(469,047)
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, fair value	18,705,445	20,195,358
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, unrealized losses	(3,131,447)	(3,687,370)
Fixed maturity securities, available for sale, allowance for credit losses	1,914	3,214	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	730,911	992,783
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, unrealized losses	(45,375)	(101,100)
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, fair value	368,307	116,388
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, unrealized losses	(63,851)	(25,268)
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, fair value	1,099,218	1,109,171
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, unrealized losses	(109,226)	(126,368)
Fixed maturity securities, available for sale, allowance for credit losses	133	133	$ 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	1,116,038	2,941,293
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, unrealized losses	(82,985)	(302,513)
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, fair value	2,485,544	651,923
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, unrealized losses	(329,147)	(109,257)
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, fair value	3,601,582	3,593,216
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, unrealized losses	(412,132)	(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	1,701,535	2,561,390
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, unrealized losses	(68,465)	(162,821)
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, fair value	3,050,769	1,924,026
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, unrealized losses	(283,965)	(232,468)
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, fair value	4,752,304	4,485,416
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, unrealized losses	(352,430)	(395,289)
Fixed maturity securities, available for sale, allowance for credit losses	$ 0	$ 0

Amount excluding accrued interest, 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).

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for more than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset.

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