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Investments (Schedule of Fixed Maturity Securities) (Details) - USD ($) $ in Thousands | Jun. 30, 2023 | Mar. 31, 2023 | Dec. 31, 2022 | Jun. 30, 2022 | Mar. 31, 2022 | Dec. 31, 2021
--- | --- | --- | --- | --- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |  |
Fixed maturity securities, available for sale, amortized cost | $ 43,323,015 |  | $ 44,866,019 |  |  |  |
Fixed maturity securities, available for sale, gross unrealized gains | 174,149 |  | 225,792 |  |  |  |
Fixed maturity securities, available for sale, gross unrealized losses | (4,812,561) |  | (5,283,847) |  |  |  |
Fixed maturity securities, available for sale, allowance for credit losses | (4,146) | $ (2,047) | (3,347) |  | $ (6,187) | $ (6,577) | $ (2,846)
Fair Value | 38,680,457 |  | 39,804,617 | [1] |  |  |
Accrued interest receivable | 416,500 |  | 425,400 |  |  |  |
U.S. Government and agencies |  |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |  |
Fixed maturity securities, available for sale, amortized cost | 179,087 |  | 173,638 |  |  |  |
Fixed maturity securities, available for sale, gross unrealized gains | 66 |  | 70 |  |  |  |
Fixed maturity securities, available for sale, gross unrealized losses | (3,691) |  | (4,637) |  |  |  |
Fixed maturity securities, available for sale, allowance for credit losses | 0 |  | 0 |  |  |  |
Fair Value | 175,462 |  | 169,071 |  |  |  |
States, municipalities and territories |  |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |  |
Fixed maturity securities, available for sale, amortized cost | 3,706,837 |  | 4,356,251 |  |  |  |
Fixed maturity securities, available for sale, gross unrealized gains | 25,316 |  | 41,565 |  |  |  |
Fixed maturity securities, available for sale, gross unrealized losses | (470,794) |  | (574,834) |  |  |  |
Fixed maturity securities, available for sale, allowance for credit losses | 0 | 0 | 0 |  | (1,834) | (2,009) | (2,776)
Fair Value | 3,261,359 |  | 3,822,982 |  |  |  |
Foreign corporate securities and foreign governments |  |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |  |
Fixed maturity securities, available for sale, amortized cost | 649,101 |  | 748,770 |  |  |  |
Fixed maturity securities, available for sale, gross unrealized gains | 3,491 |  | 11,661 |  |  |  |
Fixed maturity securities, available for sale, gross unrealized losses | (78,675) |  | (83,579) |  |  |  |
Fixed maturity securities, available for sale, allowance for credit losses | 0 |  | 0 |  |  |  |
Fair Value | 573,917 |  | 676,852 |  |  |  |
Corporate securities |  |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |  |
Fixed maturity securities, available for sale, amortized cost | 25,268,072 |  | 27,706,440 |  |  |  |
Fixed maturity securities, available for sale, gross unrealized gains | 123,687 |  | 146,065 |  |  |  |
Fixed maturity securities, available for sale, gross unrealized losses | (3,319,418) |  | (3,687,370) |  |  |  |
Fixed maturity securities, available for sale, allowance for credit losses | (3,132) | (1,914) | (3,214) |  | (3,743) | (3,825) | 0
Fair Value | 22,069,209 |  | 24,161,921 |  |  |  |
Residential mortgage backed securities |  |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |  |
Fixed maturity securities, available for sale, amortized cost | 1,593,824 |  | 1,492,242 |  |  |  |
Fixed maturity securities, available for sale, gross unrealized gains | 7,650 |  | 11,870 |  |  |  |
Fixed maturity securities, available for sale, gross unrealized losses | (128,110) |  | (126,368) |  |  |  |
Fixed maturity securities, available for sale, allowance for credit losses | (67) | (133) | (133) |  | (610) | (743) | (70)
Fair Value | 1,473,297 |  | 1,377,611 |  |  |  |
Commercial mortgage backed securities |  |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |  |
Fixed maturity securities, available for sale, amortized cost | 4,041,901 |  | 4,098,755 |  |  |  |
Fixed maturity securities, available for sale, gross unrealized gains | 609 |  | 493 |  |  |  |
Fixed maturity securities, available for sale, gross unrealized losses | (488,892) |  | (411,770) |  |  |  |
Fixed maturity securities, available for sale, allowance for credit losses | 0 | 0 | 0 |  | 0 | 0 | 0
Fair Value | 3,553,618 |  | 3,687,478 |  |  |  |
Other asset backed securities |  |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |  |
Fixed maturity securities, available for sale, amortized cost | 7,884,193 |  | 6,289,923 |  |  |  |
Fixed maturity securities, available for sale, gross unrealized gains | 13,330 |  | 14,068 |  |  |  |
Fixed maturity securities, available for sale, gross unrealized losses | (322,981) |  | (395,289) |  |  |  |
Fixed maturity securities, available for sale, allowance for credit losses | (947) | $ 0 | 0 |  | $ 0 | $ 0 | $ 0
Fair Value | $ 7,573,595 |  | $ 5,908,702 |  |  |  |
[1] | Certain prior period amounts have been recast. See Note 1 - Significant Accounting Policies for more information.

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