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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
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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

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