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Investments (Gross Unrealized Losses on Investments, By Category and Length of Time) (Details) - USD ($) $ in Thousands | Mar. 31, 2022 | Dec. 31, 2021 | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | --- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, fair value |  | $ 20,483,651 | $ 5,735,135 |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, unrealized losses | [1] | (1,267,155) | (51,758) |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, fair value |  | 2,002,636 | 2,072,853 |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, unrealized losses | [1] | (107,147) | (63,458) |  |
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, fair value |  | 22,486,287 | 7,807,988 |  |
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, unrealized losses | [1] | (1,374,302) | (115,216) |  |
Fixed maturity securities, available for sale, allowance for credit losses |  | 6,577 | 2,846 | $ 59,698 | $ 64,771
United States Government Full Faith and Credit |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, fair value |  | 27,565 | 1,007 |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, unrealized losses | [1] | (686) | (34) |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, fair value |  | 434 | 0 |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, unrealized losses | [1] | (38) | 0 |  |
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, fair value |  | 27,999 | 1,007 |  |
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, unrealized losses | [1] | (724) | (34) |  |
Fixed maturity securities, available for sale, allowance for credit losses |  | 0 | 0 |  |
United States Government Sponsored Agencies |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, fair value |  | 11,468 | 759,970 |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, unrealized losses | [1] | (2,224) | (90) |  |
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 |  | 11,468 | 759,970 |  |
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, unrealized losses | [1] | (2,224) | (90) |  |
Fixed maturity securities, available for sale, allowance for credit losses |  | 0 | 0 |  |
United States Municipalities, States 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 |  | 1,161,530 | 168,942 |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, unrealized losses | [1] | (94,117) | (2,468) |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, fair value |  | 18,344 | 15,711 |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, unrealized losses | [1] | (2,505) | (3,350) |  |
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, fair value |  | 1,179,874 | 184,653 |  |
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, unrealized losses | [1] | (96,622) | (5,818) |  |
Fixed maturity securities, available for sale, allowance for credit losses |  | 2,009 | 2,776 | 2,791 | 2,844
Foreign Government Obligations |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, fair value |  | 252,267 | 42,861 |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, unrealized losses | [1] | (21,236) | (843) |  |
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 |  | 252,267 | 42,861 |  |
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, unrealized losses | [1] | (21,236) | (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 |  | 12,808,738 | 2,375,603 |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, unrealized losses | [1] | (965,862) | (30,070) |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, fair value |  | 131,098 | 116,819 |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, unrealized losses | [1] | (22,033) | (8,372) |  |
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, fair value |  | 12,939,836 | 2,492,422 |  |
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, unrealized losses | [1] | (987,895) | (38,442) |  |
Fixed maturity securities, available for sale, allowance for credit losses |  | 3,825 | 0 | 55,715 | 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 |  | 501,285 | 250,964 |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, unrealized losses | [1] | (21,186) | (1,408) |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, fair value |  | 32,665 | 26,917 |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, unrealized losses | [1] | (2,379) | (755) |  |
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, fair value |  | 533,950 | 277,881 |  |
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, unrealized losses | [1] | (23,565) | (2,163) |  |
Fixed maturity securities, available for sale, allowance for credit losses |  | 743 | 70 | 1,192 | 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 |  | 3,217,274 | 784,464 |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, unrealized losses | [1] | (111,459) | (5,500) |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, fair value |  | 88,148 | 142,224 |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, unrealized losses | [1] | (15,992) | (12,219) |  |
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, fair value |  | 3,305,422 | 926,688 |  |
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, unrealized losses | [1] | (127,451) | (17,719) |  |
Fixed maturity securities, available for sale, allowance for credit losses |  | 0 | 0 | 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 |  | 2,503,524 | 1,351,324 |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, unrealized losses | [1] | (50,385) | (11,345) |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, fair value |  | 1,731,947 | 1,771,182 |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, unrealized losses | [1] | (64,200) | (38,762) |  |
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, fair value |  | 4,235,471 | 3,122,506 |  |
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, unrealized losses | [1] | (114,585) | (50,107) |  |
Fixed maturity securities, available for sale, allowance for credit losses |  | $ 0 | $ 0 | $ 0 | $ 0
[1] | Unrealized losses have not been reduced to reflect the allowance for credit losses of $6.6 million and $2.8 million as of March 31, 2022 and December 31, 2021, respectively.

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