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Investments (Gross Unrealized Losses on Investments, By Category and Length of Time) (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Jun. 30, 2023 | Dec. 31, 2022 | Sep. 30, 2022 | Jun. 30, 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 | $ 5,100,241 |  | $ 28,557,796 |  |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, unrealized losses | (268,091) |  | (4,403,539) |  |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, fair value | 23,734,655 |  | 4,221,422 |  |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, unrealized losses | (5,534,806) |  | (880,308) |  |  |
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, fair value | 28,834,896 |  | 32,779,218 |  |  |
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, unrealized losses | (5,802,897) |  | (5,283,847) |  |  |
Fixed maturity securities, available for sale, allowance for credit losses | 3,618 | $ 4,146 | 3,347 | $ 4,920 | $ 6,187 | $ 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 | 116,484 |  | 160,201 |  |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, unrealized losses | (6,223) |  | (4,512) |  |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, fair value | 45,991 |  | 908 |  |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, unrealized losses | (3,549) |  | (125) |  |  |
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, fair value | 162,475 |  | 161,109 |  |  |
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, unrealized losses | (9,772) |  | (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 | 229,082 |  | 2,595,122 |  |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, unrealized losses | (19,688) |  | (537,313) |  |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, fair value | 2,168,957 |  | 95,184 |  |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, unrealized losses | (618,782) |  | (37,521) |  |  |
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, fair value | 2,398,039 |  | 2,690,306 |  |  |
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, unrealized losses | (638,470) |  | (574,834) |  |  |
Fixed maturity securities, available for sale, allowance for credit losses | 0 | 0 | 0 | 0 | 1,834 | 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 | 14,610 |  | 522,826 |  |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, unrealized losses | (70) |  | (76,957) |  |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, fair value | 393,715 |  | 21,816 |  |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, unrealized losses | (106,748) |  | (6,622) |  |  |
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, fair value | 408,325 |  | 544,642 |  |  |
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, unrealized losses | (106,818) |  | (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 | 2,888,535 |  | 18,784,181 |  |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, unrealized losses | (163,562) |  | (3,218,323) |  |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, fair value | 14,312,197 |  | 1,411,177 |  |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, unrealized losses | (3,938,910) |  | (469,047) |  |  |
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, fair value | 17,200,732 |  | 20,195,358 |  |  |
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, unrealized losses | (4,102,472) |  | (3,687,370) |  |  |
Fixed maturity securities, available for sale, allowance for credit losses | 2,911 | 3,132 | 3,214 | 3,214 | 3,743 | 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 | 487,935 |  | 992,783 |  |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, unrealized losses | (25,263) |  | (101,100) |  |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, fair value | 772,581 |  | 116,388 |  |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, unrealized losses | (137,886) |  | (25,268) |  |  |
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, fair value | 1,260,516 |  | 1,109,171 |  |  |
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, unrealized losses | (163,149) |  | (126,368) |  |  |
Fixed maturity securities, available for sale, allowance for credit losses | 97 | 67 | 133 | 1,706 | 610 | 70
Commercial Mortgage-Backed Securities [Member] |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, fair value | 181,256 |  | 2,941,293 |  |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, unrealized losses | (7,607) |  | (302,513) |  |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, fair value | 2,734,129 |  | 651,923 |  |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, unrealized losses | (530,639) |  | (109,257) |  |  |
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, fair value | 2,915,385 |  | 3,593,216 |  |  |
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, unrealized losses | (538,246) |  | (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 | 1,182,339 |  | 2,561,390 |  |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, unrealized losses | (45,678) |  | (162,821) |  |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, fair value | 3,307,085 |  | 1,924,026 |  |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, unrealized losses | (198,292) |  | (232,468) |  |  |
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, fair value | 4,489,424 |  | 4,485,416 |  |  |
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, unrealized losses | (243,970) |  | (395,289) |  |  |
Fixed maturity securities, available for sale, allowance for credit losses | $ 610 | $ 947 | $ 0 | $ 0 | $ 0 | $ 0

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