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Investments (Gross Unrealized Losses on Investments, By Category and Length of Time) (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
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Debt Securities, Available-for-sale [Line Items] |  |  |
Available for sale, continuous unrealized loss position, less than 12 months, fair value | $ 5,327,830 | $ 28,557,796 |
Available for sale, continuous unrealized loss position, less than 12 months, unrealized losses | (389,277) | (4,403,539) |
Available for sale, continuous unrealized loss position, 12 months or more, fair value | 22,724,213 | 4,221,422 |
Available for sale, continuous unrealized loss position, 12 months or more, unrealized losses | (3,601,562) | (880,308) |
Available for sale, continuous unrealized loss position, total, fair value | 28,052,043 | 32,779,218 |
Available for sale, continuous unrealized loss position, total, unrealized losses | (3,990,839) | (5,283,847) |
Fixed maturity securities, available for sale, allowance for credit losses | 4,030 | 3,347 | $ 2,846
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 | 55,087 | 160,201 |
Available for sale, continuous unrealized loss position, less than 12 months, unrealized losses | (279) | (4,512) |
Available for sale, continuous unrealized loss position, 12 months or more, fair value | 47,639 | 908 |
Available for sale, continuous unrealized loss position, 12 months or more, unrealized losses | (1,869) | (125) |
Available for sale, continuous unrealized loss position, total, fair value | 102,726 | 161,109 |
Available for sale, continuous unrealized loss position, total, unrealized losses | (2,148) | (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] |  |  |
Available for sale, continuous unrealized loss position, less than 12 months, fair value | 451,091 | 2,595,122 |
Available for sale, continuous unrealized loss position, less than 12 months, unrealized losses | (44,832) | (537,313) |
Available for sale, continuous unrealized loss position, 12 months or more, fair value | 2,290,704 | 95,184 |
Available for sale, continuous unrealized loss position, 12 months or more, unrealized losses | (528,276) | (37,521) |
Available for sale, continuous unrealized loss position, total, fair value | 2,741,795 | 2,690,306 |
Available for sale, continuous unrealized loss position, total, unrealized losses | (573,108) | (574,834) |
Fixed maturity securities, available for sale, allowance for credit losses | 0 | 0 | 2,776
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 | 1,555 | 522,826 |
Available for sale, continuous unrealized loss position, less than 12 months, unrealized losses | (195) | (76,957) |
Available for sale, continuous unrealized loss position, 12 months or more, fair value | 427,021 | 21,816 |
Available for sale, continuous unrealized loss position, 12 months or more, unrealized losses | (71,625) | (6,622) |
Available for sale, continuous unrealized loss position, total, fair value | 428,576 | 544,642 |
Available for sale, continuous unrealized loss position, total, unrealized losses | (71,820) | (83,579) |
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 | 3,275,031 | 18,784,181 |
Available for sale, continuous unrealized loss position, less than 12 months, unrealized losses | (237,744) | (3,218,323) |
Available for sale, continuous unrealized loss position, 12 months or more, fair value | 13,625,542 | 1,411,177 |
Available for sale, continuous unrealized loss position, 12 months or more, unrealized losses | (2,367,304) | (469,047) |
Available for sale, continuous unrealized loss position, total, fair value | 16,900,573 | 20,195,358 |
Available for sale, continuous unrealized loss position, total, unrealized losses | (2,605,048) | (3,687,370) |
Fixed maturity securities, available for sale, allowance for credit losses | 3,412 | 3,214 | 0
Residential mortgage backed securities |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Available for sale, continuous unrealized loss position, less than 12 months, fair value | 145,093 | 992,783 |
Available for sale, continuous unrealized loss position, less than 12 months, unrealized losses | (7,614) | (101,100) |
Available for sale, continuous unrealized loss position, 12 months or more, fair value | 858,821 | 116,388 |
Available for sale, continuous unrealized loss position, 12 months or more, unrealized losses | (105,122) | (25,268) |
Available for sale, continuous unrealized loss position, total, fair value | 1,003,914 | 1,109,171 |
Available for sale, continuous unrealized loss position, total, unrealized losses | (112,736) | (126,368) |
Fixed maturity securities, available for sale, allowance for credit losses | 0 | 133 | 70
Commercial mortgage backed securities |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Available for sale, continuous unrealized loss position, less than 12 months, fair value | 431,947 | 2,941,293 |
Available for sale, continuous unrealized loss position, less than 12 months, unrealized losses | (69,007) | (302,513) |
Available for sale, continuous unrealized loss position, 12 months or more, fair value | 2,416,868 | 651,923 |
Available for sale, continuous unrealized loss position, 12 months or more, unrealized losses | (385,088) | (109,257) |
Available for sale, continuous unrealized loss position, total, fair value | 2,848,815 | 3,593,216 |
Available for sale, continuous unrealized loss position, total, unrealized losses | (454,095) | (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] |  |  |
Available for sale, continuous unrealized loss position, less than 12 months, fair value | 968,026 | 2,561,390 |
Available for sale, continuous unrealized loss position, less than 12 months, unrealized losses | (29,606) | (162,821) |
Available for sale, continuous unrealized loss position, 12 months or more, fair value | 3,057,618 | 1,924,026 |
Available for sale, continuous unrealized loss position, 12 months or more, unrealized losses | (142,278) | (232,468) |
Available for sale, continuous unrealized loss position, total, fair value | 4,025,644 | 4,485,416 |
Available for sale, continuous unrealized loss position, total, unrealized losses | (171,884) | (395,289) |
Fixed maturity securities, available for sale, allowance for credit losses | $ 618 | $ 0 | $ 0

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