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Investments (Schedule of Fixed Maturity Securities) (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Fixed maturity securities, available for sale, amortized cost | [1] | $ 44,866,019 | $ 46,999,183 |
Fixed maturity securities, available for sale, gross unrealized gains |  | 225,792 | 4,421,976 |
Fixed maturity securities, available for sale, gross unrealized losses | [2] | (5,283,847) | (112,370) |
Fixed maturity securities, available for sale, allowance for credit losses |  | (3,347) | (2,846) | $ (64,771)
Fixed maturity securities, available for sale |  | 39,804,617 | 51,305,943 |
U.S. Government and Agencies |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Fixed maturity securities, available for sale, amortized cost | [1] | 173,638 | 1,046,029 |
Fixed maturity securities, available for sale, gross unrealized gains |  | 70 | 32,841 |
Fixed maturity securities, available for sale, gross unrealized losses | [2] | (4,637) | (124) |
Fixed maturity securities, available for sale, allowance for credit losses |  | 0 | 0 |
Fixed maturity securities, available for sale |  | 169,071 | 1,078,746 |
States, Municipalities and Territories |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Fixed maturity securities, available for sale, amortized cost | [1] | 4,356,251 | 3,495,563 |
Fixed maturity securities, available for sale, gross unrealized gains |  | 41,565 | 437,456 |
Fixed maturity securities, available for sale, gross unrealized losses | [2] | (574,834) | (3,042) |
Fixed maturity securities, available for sale, allowance for credit losses |  | 0 | (2,776) | (2,844)
Fixed maturity securities, available for sale |  | 3,822,982 | 3,927,201 |
Foreign Corporate Securities and Foreign Governments |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Fixed maturity securities, available for sale, amortized cost | [1] | 748,770 | 380,646 |
Fixed maturity securities, available for sale, gross unrealized gains |  | 11,661 | 22,742 |
Fixed maturity securities, available for sale, gross unrealized losses | [2] | (83,579) | (843) |
Fixed maturity securities, available for sale, allowance for credit losses |  | 0 | 0 |
Fixed maturity securities, available for sale |  | 676,852 | 402,545 |
Corporate Securities |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Fixed maturity securities, available for sale, amortized cost | [1] | 27,706,440 | 31,084,629 |
Fixed maturity securities, available for sale, gross unrealized gains |  | 146,065 | 3,614,047 |
Fixed maturity securities, available for sale, gross unrealized losses | [2] | (3,687,370) | (38,442) |
Fixed maturity securities, available for sale, allowance for credit losses |  | (3,214) | 0 | (60,193)
Fixed maturity securities, available for sale |  | 24,161,921 | 34,660,234 |
Residential Mortgage Backed Securities |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Fixed maturity securities, available for sale, amortized cost | [1] | 1,492,242 | 1,056,778 |
Fixed maturity securities, available for sale, gross unrealized gains |  | 11,870 | 70,434 |
Fixed maturity securities, available for sale, gross unrealized losses | [2] | (126,368) | (2,093) |
Fixed maturity securities, available for sale, allowance for credit losses |  | (133) | (70) | $ (1,734)
Fixed maturity securities, available for sale |  | 1,377,611 | 1,125,049 |
Commercial Mortgage Backed Securities |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Fixed maturity securities, available for sale, amortized cost | [1] | 4,098,755 | 4,708,878 |
Fixed maturity securities, available for sale, gross unrealized gains |  | 493 | 149,152 |
Fixed maturity securities, available for sale, gross unrealized losses | [2] | (411,770) | (17,719) |
Fixed maturity securities, available for sale, allowance for credit losses |  | 0 | 0 |
Fixed maturity securities, available for sale |  | 3,687,478 | 4,840,311 |
Other Asset Backed Securities |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Fixed maturity securities, available for sale, amortized cost | [1] | 6,289,923 | 5,226,660 |
Fixed maturity securities, available for sale, gross unrealized gains |  | 14,068 | 95,304 |
Fixed maturity securities, available for sale, gross unrealized losses | [2] | (395,289) | (50,107) |
Fixed maturity securities, available for sale, allowance for credit losses |  | 0 | 0 |
Fixed maturity securities, available for sale |  | 5,908,702 | 5,271,857 |
Fixed Maturity Securities, Available For Sale |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Accrued interest receivable |  | $ 425,400 | $ 400,700 |
[1] | Amortized cost excludes accrued interest receivable of $425.4 million and $400.7 million as of December 31, 2022 and 2021, respectively.
[2] | Gross unrealized losses are net of allowance for credit losses.

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