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Investments (Schedule of Fixed Maturity Securities) (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, amortized cost | [1] | $ 49,364,915 | $ 46,999,183 |  |
Fixed maturity securities, available for sale, gross unrealized gains |  | 1,671,507 | 4,421,976 |  |
Fixed maturity securities, available for sale, gross unrealized losses | [2] | (1,367,725) | (112,370) |  |
Fixed maturity securities, available for sale, allowance for credit losses |  | (6,577) | (2,846) | $ (59,698) | $ (64,771)
Fixed maturity securities, available for sale, fair value |  | 49,662,120 | 51,305,943 |  |
Accrued interest receivable |  | 440,500 | 400,700 |  |
United States Government Full Faith and Credit |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Fixed maturity securities, available for sale, amortized cost | [1] | 39,302 | 37,109 |  |
Fixed maturity securities, available for sale, gross unrealized gains |  | 88 | 718 |  |
Fixed maturity securities, available for sale, gross unrealized losses | [2] | (724) | (34) |  |
Fixed maturity securities, available for sale, allowance for credit losses |  | 0 | 0 |  |
Fixed maturity securities, available for sale, fair value |  | 38,666 | 37,793 |  |
United States Government Sponsored Agencies |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Fixed maturity securities, available for sale, amortized cost | [1] | 158,596 | 1,008,920 |  |
Fixed maturity securities, available for sale, gross unrealized gains |  | 18,473 | 32,123 |  |
Fixed maturity securities, available for sale, gross unrealized losses | [2] | (2,224) | (90) |  |
Fixed maturity securities, available for sale, allowance for credit losses |  | 0 | 0 |  |
Fixed maturity securities, available for sale, fair value |  | 174,845 | 1,040,953 |  |
United States Municipalities, States and Territories |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Fixed maturity securities, available for sale, amortized cost | [1] | 3,694,146 | 3,495,563 |  |
Fixed maturity securities, available for sale, gross unrealized gains |  | 214,986 | 437,456 |  |
Fixed maturity securities, available for sale, gross unrealized losses | [2] | (94,613) | (3,042) |  |
Fixed maturity securities, available for sale, allowance for credit losses |  | (2,009) | (2,776) | (2,791) | (2,844)
Fixed maturity securities, available for sale, fair value |  | 3,812,510 | 3,927,201 |  |
Foreign Government Obligations |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Fixed maturity securities, available for sale, amortized cost | [1] | 415,227 | 380,646 |  |
Fixed maturity securities, available for sale, gross unrealized gains |  | 11,175 | 22,742 |  |
Fixed maturity securities, available for sale, gross unrealized losses | [2] | (21,236) | (843) |  |
Fixed maturity securities, available for sale, allowance for credit losses |  | 0 | 0 |  |
Fixed maturity securities, available for sale, fair value |  | 405,166 | 402,545 |  |
Corporate Securities |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Fixed maturity securities, available for sale, amortized cost | [1] | 33,550,018 | 31,084,629 |  |
Fixed maturity securities, available for sale, gross unrealized gains |  | 1,311,404 | 3,614,047 |  |
Fixed maturity securities, available for sale, gross unrealized losses | [2] | (984,070) | (38,442) |  |
Fixed maturity securities, available for sale, allowance for credit losses |  | (3,825) | 0 | (55,715) | (60,193)
Fixed maturity securities, available for sale, fair value |  | 33,873,527 | 34,660,234 |  |
Residential Mortgage Backed Securities |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Fixed maturity securities, available for sale, amortized cost | [1] | 1,195,436 | 1,056,778 |  |
Fixed maturity securities, available for sale, gross unrealized gains |  | 38,688 | 70,434 |  |
Fixed maturity securities, available for sale, gross unrealized losses | [2] | (22,822) | (2,093) |  |
Fixed maturity securities, available for sale, allowance for credit losses |  | (743) | (70) | (1,192) | (1,734)
Fixed maturity securities, available for sale, fair value |  | 1,210,559 | 1,125,049 |  |
Commercial Mortgage Backed Securities |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Fixed maturity securities, available for sale, amortized cost | [1] | 4,873,980 | 4,708,878 |  |
Fixed maturity securities, available for sale, gross unrealized gains |  | 23,338 | 149,152 |  |
Fixed maturity securities, available for sale, gross unrealized losses | [2] | (127,451) | (17,719) |  |
Fixed maturity securities, available for sale, allowance for credit losses |  | 0 | 0 | 0 | 0
Fixed maturity securities, available for sale, fair value |  | 4,769,867 | 4,840,311 |  |
Other Asset Backed Securities |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Fixed maturity securities, available for sale, amortized cost | [1] | 5,438,210 | 5,226,660 |  |
Fixed maturity securities, available for sale, gross unrealized gains |  | 53,355 | 95,304 |  |
Fixed maturity securities, available for sale, gross unrealized losses | [2] | (114,585) | (50,107) |  |
Fixed maturity securities, available for sale, allowance for credit losses |  | 0 | 0 | $ 0 | $ 0
Fixed maturity securities, available for sale, fair value |  | $ 5,376,980 | $ 5,271,857 |  |
[1] | Amortized cost excludes accrued interest receivable of $440.5 million and $400.7 million as of March 31, 2022 and December 31, 2021, respectively.
[2] | Gross unrealized losses are net of allowance for credit losses.

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