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Investments (Gross Unrealized Losses on Investments, By Category and Length of Time) (Details) - USD ($) $ in Thousands | Sep. 30, 2022 | Jun. 30, 2022 | Dec. 31, 2021 | Sep. 30, 2021 | Jun. 30, 2021 | Dec. 31, 2020
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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 |  | $ 33,142,745 |  | $ 5,735,135 |  |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, unrealized losses | [1] | (5,396,279) |  | (51,758) |  |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, fair value |  | 1,594,124 |  | 2,072,853 |  |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, unrealized losses | [1] | (283,408) |  | (63,458) |  |  |
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, fair value |  | 34,736,869 |  | 7,807,988 |  |  |
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, unrealized losses | [1] | (5,679,687) |  | (115,216) |  |  |
Fixed maturity securities, available for sale, allowance for credit losses |  | 4,920 | $ 6,187 | 2,846 | $ 4,074 | $ 14,190 | $ 64,771
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 |  | 132,334 |  | 760,977 |  |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, unrealized losses | [1] | (3,538) |  | (124) |  |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, fair value |  | 0 |  | 0 |  |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, unrealized losses | [1] | 0 |  | 0 |  |  |
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, fair value |  | 132,334 |  | 760,977 |  |  |
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, unrealized losses | [1] | (3,538) |  | (124) |  |  |
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 |  | 2,890,984 |  | 168,942 |  |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, unrealized losses | [1] | (556,773) |  | (2,468) |  |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, fair value |  | 2,572 |  | 15,711 |  |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, unrealized losses | [1] | (1,226) |  | (3,350) |  |  |
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, fair value |  | 2,893,556 |  | 184,653 |  |  |
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, unrealized losses | [1] | (557,999) |  | (5,818) |  |  |
Fixed maturity securities, available for sale, allowance for credit losses |  | 0 | 1,834 | 2,776 | 2,772 | 3,347 | 2,844
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 |  | 634,949 |  | 42,861 |  |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, unrealized losses | [1] | (96,583) |  | (843) |  |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, fair value |  | 3,163 |  | 0 |  |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, unrealized losses | [1] | (2,123) |  | 0 |  |  |
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, fair value |  | 638,112 |  | 42,861 |  |  |
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, unrealized losses | [1] | (98,706) |  | (843) |  |  |
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 |  | 22,263,446 |  | 2,375,603 |  |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, unrealized losses | [1] | (4,055,115) |  | (30,070) |  |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, fair value |  | 94,985 |  | 116,819 |  |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, unrealized losses | [1] | (39,901) |  | (8,372) |  |  |
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, fair value |  | 22,358,431 |  | 2,492,422 |  |  |
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, unrealized losses | [1] | (4,095,016) |  | (38,442) |  |  |
Fixed maturity securities, available for sale, allowance for credit losses |  | 3,214 | 3,743 | 0 | 1,006 | 10,723 | 60,193
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 |  | 1,080,905 |  | 250,964 |  |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, unrealized losses | [1] | (102,854) |  | (1,408) |  |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, fair value |  | 37,416 |  | 26,917 |  |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, unrealized losses | [1] | (6,232) |  | (755) |  |  |
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, fair value |  | 1,118,321 |  | 277,881 |  |  |
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, unrealized losses | [1] | (109,086) |  | (2,163) |  |  |
Fixed maturity securities, available for sale, allowance for credit losses |  | 1,706 | $ 610 | 70 | $ 296 | $ 120 | $ 1,734
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 |  | 3,562,772 |  | 784,464 |  |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, unrealized losses | [1] | (361,686) |  | (5,500) |  |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, fair value |  | 42,624 |  | 142,224 |  |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, unrealized losses | [1] | (8,949) |  | (12,219) |  |  |
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, fair value |  | 3,605,396 |  | 926,688 |  |  |
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, unrealized losses | [1] | (370,635) |  | (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] |  |  |  |  |  |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, fair value |  | 2,577,355 |  | 1,351,324 |  |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, unrealized losses | [1] | (219,730) |  | (11,345) |  |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, fair value |  | 1,413,364 |  | 1,771,182 |  |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, unrealized losses | [1] | (224,977) |  | (38,762) |  |  |
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, fair value |  | 3,990,719 |  | 3,122,506 |  |  |
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, unrealized losses | [1] | (444,707) |  | (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 $4.9 million and $2.8 million as of September 30, 2022 and December 31, 2021, respectively.

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