Investments (Summary Of Aggregate Market Value And Gross Unrealized Depreciation Of Fixed Maturity And Equity Securities, By Contractual Maturity) (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Fixed Maturity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Market Value	$ 16,646,452	$ 8,094,261
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation	(1,251,844)	(127,800)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value	2,291,464	1,240,691
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation	(313,749)	(75,330)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value	18,937,916	9,334,952
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total	(1,565,593)	(203,130)
No Recorded Allowance for Credit Losses [Member]
Schedule of Available-for-sale Securities [Line Items]
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Market Value	16,639,239
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation	(1,250,755)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value	2,291,464
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation	(313,749)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value	18,930,703
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total	(1,564,504)
Due In One Year Or Less [Member]
Schedule of Available-for-sale Securities [Line Items]
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Market Value	660,642	129,860
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation	(4,878)	(2,415)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value	90,052	136,827
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation	(7,477)	(11,832)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value	750,694	266,687
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total	(12,355)	(14,247)
Due In One Year Through Five Years [Member]
Schedule of Available-for-sale Securities [Line Items]
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Market Value	5,163,545	2,165,467
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation	(300,876)	(35,264)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value	818,035	446,247
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation	(79,426)	(28,685)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value	5,981,580	2,611,714
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total	(380,302)	(63,949)
Due in Five Years Through Ten Years [Member]
Schedule of Available-for-sale Securities [Line Items]
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Market Value	3,087,307	1,727,823
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation	(359,536)	(47,413)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value	598,581	244,454
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation	(114,767)	(22,038)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value	3,685,888	1,972,277
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total	(474,303)	(69,451)
Due After Ten Years [Member]
Schedule of Available-for-sale Securities [Line Items]
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Market Value	1,233,752	791,645
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation	(219,410)	(16,482)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value	141,084	50,991
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation	(35,209)	(2,574)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value	1,374,836	842,636
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total	(254,619)	(19,056)
Asset Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Market Value	3,623,327	1,954,079
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation	(180,189)	(11,180)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value	42,484	41,823
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation	(3,052)	(668)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value	3,665,811	1,995,902
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total	(183,241)	(11,848)
Mortgage Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Market Value	2,870,666	1,325,387
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation	(185,866)	(15,046)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value	601,228	320,349
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation	(73,818)	(9,533)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value	3,471,894	1,645,736
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total	(259,684)	(24,579)
Recorded an Allowance for Credit Losses [Member]
Schedule of Available-for-sale Securities [Line Items]
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Market Value	7,213
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation	(1,089)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value	7,213	15,700
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total	$ (1,089)	$ (400)

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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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 less than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset.

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