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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
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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)

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