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Investments (Gross Unrealized Losses on Investments, By Category and Length of Time) (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
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Debt Securities, Available-for-sale [Line Items] |  |  |  |
Available for sale, continuous unrealized loss position, less than 12 months, fair value |  | $ 28,557,796 | $ 5,735,135 |
Available for sale, continuous unrealized loss position, less than 12 months, unrealized losses | [1] | (4,403,539) | (51,758) |
Available for sale, continuous unrealized loss position, 12 months or more, fair value |  | 4,221,422 | 2,072,853 |
Available for sale, continuous unrealized loss position, 12 months or more, unrealized losses | [1] | (880,308) | (63,458) |
Available for sale, continuous unrealized loss position, total, fair value |  | 32,779,218 | 7,807,988 |
Available for sale, continuous unrealized loss position, total, unrealized losses | [1] | (5,283,847) | (115,216) |
Fixed maturity securities, available for sale, allowance for credit losses |  | 3,347 | 2,846 | $ 64,771
U.S. Government and agencies |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Available for sale, continuous unrealized loss position, less than 12 months, fair value |  | 160,201 | 760,977 |
Available for sale, continuous unrealized loss position, less than 12 months, unrealized losses | [1] | (4,512) | (124) |
Available for sale, continuous unrealized loss position, 12 months or more, fair value |  | 908 | 0 |
Available for sale, continuous unrealized loss position, 12 months or more, unrealized losses | [1] | (125) | 0 |
Available for sale, continuous unrealized loss position, total, fair value |  | 161,109 | 760,977 |
Available for sale, continuous unrealized loss position, total, unrealized losses | [1] | (4,637) | (124) |
Fixed maturity securities, available for sale, allowance for credit losses |  | 0 | 0 |
States, municipalities and territories |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Available for sale, continuous unrealized loss position, less than 12 months, fair value |  | 2,595,122 | 168,942 |
Available for sale, continuous unrealized loss position, less than 12 months, unrealized losses | [1] | (537,313) | (2,468) |
Available for sale, continuous unrealized loss position, 12 months or more, fair value |  | 95,184 | 15,711 |
Available for sale, continuous unrealized loss position, 12 months or more, unrealized losses | [1] | (37,521) | (3,350) |
Available for sale, continuous unrealized loss position, total, fair value |  | 2,690,306 | 184,653 |
Available for sale, continuous unrealized loss position, total, unrealized losses | [1] | (574,834) | (5,818) |
Fixed maturity securities, available for sale, allowance for credit losses |  | 0 | 2,776 | 2,844
Foreign corporate securities and foreign governments |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Available for sale, continuous unrealized loss position, less than 12 months, fair value |  | 522,826 | 42,861 |
Available for sale, continuous unrealized loss position, less than 12 months, unrealized losses | [1] | (76,957) | (843) |
Available for sale, continuous unrealized loss position, 12 months or more, fair value |  | 21,816 | 0 |
Available for sale, continuous unrealized loss position, 12 months or more, unrealized losses | [1] | (6,622) | 0 |
Available for sale, continuous unrealized loss position, total, fair value |  | 544,642 | 42,861 |
Available for sale, continuous unrealized loss position, total, unrealized losses | [1] | (83,579) | (843) |
Fixed maturity securities, available for sale, allowance for credit losses |  | 0 | 0 |
Corporate securities |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Available for sale, continuous unrealized loss position, less than 12 months, fair value |  | 18,784,181 | 2,375,603 |
Available for sale, continuous unrealized loss position, less than 12 months, unrealized losses | [1] | (3,218,323) | (30,070) |
Available for sale, continuous unrealized loss position, 12 months or more, fair value |  | 1,411,177 | 116,819 |
Available for sale, continuous unrealized loss position, 12 months or more, unrealized losses | [1] | (469,047) | (8,372) |
Available for sale, continuous unrealized loss position, total, fair value |  | 20,195,358 | 2,492,422 |
Available for sale, continuous unrealized loss position, total, unrealized losses | [1] | (3,687,370) | (38,442) |
Fixed maturity securities, available for sale, allowance for credit losses |  | 3,214 | 0 | 60,193
Residential mortgage backed securities |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Available for sale, continuous unrealized loss position, less than 12 months, fair value |  | 992,783 | 250,964 |
Available for sale, continuous unrealized loss position, less than 12 months, unrealized losses | [1] | (101,100) | (1,408) |
Available for sale, continuous unrealized loss position, 12 months or more, fair value |  | 116,388 | 26,917 |
Available for sale, continuous unrealized loss position, 12 months or more, unrealized losses | [1] | (25,268) | (755) |
Available for sale, continuous unrealized loss position, total, fair value |  | 1,109,171 | 277,881 |
Available for sale, continuous unrealized loss position, total, unrealized losses | [1] | (126,368) | (2,163) |
Fixed maturity securities, available for sale, allowance for credit losses |  | 133 | 70 | $ 1,734
Commercial mortgage backed securities |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Available for sale, continuous unrealized loss position, less than 12 months, fair value |  | 2,941,293 | 784,464 |
Available for sale, continuous unrealized loss position, less than 12 months, unrealized losses | [1] | (302,513) | (5,500) |
Available for sale, continuous unrealized loss position, 12 months or more, fair value |  | 651,923 | 142,224 |
Available for sale, continuous unrealized loss position, 12 months or more, unrealized losses | [1] | (109,257) | (12,219) |
Available for sale, continuous unrealized loss position, total, fair value |  | 3,593,216 | 926,688 |
Available for sale, continuous unrealized loss position, total, unrealized losses | [1] | (411,770) | (17,719) |
Fixed maturity securities, available for sale, allowance for credit losses |  | 0 | 0 |
Other asset backed securities |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Available for sale, continuous unrealized loss position, less than 12 months, fair value |  | 2,561,390 | 1,351,324 |
Available for sale, continuous unrealized loss position, less than 12 months, unrealized losses | [1] | (162,821) | (11,345) |
Available for sale, continuous unrealized loss position, 12 months or more, fair value |  | 1,924,026 | 1,771,182 |
Available for sale, continuous unrealized loss position, 12 months or more, unrealized losses | [1] | (232,468) | (38,762) |
Available for sale, continuous unrealized loss position, total, fair value |  | 4,485,416 | 3,122,506 |
Available for sale, continuous unrealized loss position, total, unrealized losses | [1] | (395,289) | (50,107) |
Fixed maturity securities, available for sale, allowance for credit losses |  | $ 0 | $ 0 |
[1] | Unrealized losses have not been reduced to reflect the allowance for credit losses of $3.3 million and $2.8 million as of December 31, 2022 and 2021, respectively.

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