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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
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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 | $ 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 |  |

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