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Investments (Schedule of Fixed Maturity Securities) (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Jun. 30, 2021 | Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Dec. 31, 2019
--- | --- | --- | --- | --- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |  |
Fixed maturity securities, available for sale, amortized cost | [1] | $ 41,247,540 |  | $ 42,304,736 |  |  |
Fixed maturity securities, available for sale, gross unrealized gains |  | 4,582,602 |  | 5,549,754 |  |  |
Fixed maturity securities, available for sale, gross unrealized losses | [2] | (87,971) |  | (250,826) |  |  |
Fixed maturity securities, available for sale, allowance for credit losses |  | (4,074) | $ (14,190) | (64,771) | $ (61,619) | $ (50,186) | $ 0
Fixed maturity securities, available for sale, fair value |  | 45,738,097 |  | 47,538,893 |  |  |
Accrued interest receivable |  | 388,400 |  | 377,500 |  |  |
United States Government Full Faith and Credit |  |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |  |
Fixed maturity securities, available for sale, amortized cost | [1] | 37,112 |  | 37,471 |  |  |
Fixed maturity securities, available for sale, gross unrealized gains |  | 1,398 |  | 2,300 |  |  |
Fixed maturity securities, available for sale, gross unrealized losses | [2] | (24) |  | 0 |  |  |
Fixed maturity securities, available for sale, allowance for credit losses |  | 0 |  | 0 |  |  |
Fixed maturity securities, available for sale, fair value |  | 38,486 |  | 39,771 |  |  |
United States Government Sponsored Agencies |  |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |  |
Fixed maturity securities, available for sale, amortized cost | [1] | 1,008,980 |  | 995,465 |  |  |
Fixed maturity securities, available for sale, gross unrealized gains |  | 34,371 |  | 44,132 |  |  |
Fixed maturity securities, available for sale, gross unrealized losses | [2] | 0 |  | (46) |  |  |
Fixed maturity securities, available for sale, allowance for credit losses |  | 0 |  | 0 |  |  |
Fixed maturity securities, available for sale, fair value |  | 1,043,351 |  | 1,039,551 |  |  |
United States Municipalities, States and Territories |  |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |  |
Fixed maturity securities, available for sale, amortized cost | [1] | 3,142,857 |  | 3,236,767 |  |  |
Fixed maturity securities, available for sale, gross unrealized gains |  | 457,359 |  | 543,252 |  |  |
Fixed maturity securities, available for sale, gross unrealized losses | [2] | (1,188) |  | (1,044) |  |  |
Fixed maturity securities, available for sale, allowance for credit losses |  | (2,772) | (3,347) | (2,844) | 0 | 0 | 0
Fixed maturity securities, available for sale, fair value |  | 3,596,256 |  | 3,776,131 |  |  |
Foreign Government Obligations |  |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |  |
Fixed maturity securities, available for sale, amortized cost | [1] | 177,101 |  | 177,062 |  |  |
Fixed maturity securities, available for sale, gross unrealized gains |  | 18,240 |  | 25,644 |  |  |
Fixed maturity securities, available for sale, gross unrealized losses | [2] | 0 |  | 0 |  |  |
Fixed maturity securities, available for sale, allowance for credit losses |  | 0 |  | 0 |  |  |
Fixed maturity securities, available for sale, fair value |  | 195,341 |  | 202,706 |  |  |
Corporate Securities |  |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |  |
Fixed maturity securities, available for sale, amortized cost | [1] | 27,342,408 |  | 26,745,196 |  |  |
Fixed maturity securities, available for sale, gross unrealized gains |  | 3,695,003 |  | 4,507,716 |  |  |
Fixed maturity securities, available for sale, gross unrealized losses | [2] | (14,518) |  | (35,892) |  |  |
Fixed maturity securities, available for sale, allowance for credit losses |  | (1,006) | (10,723) | (60,193) | (53,045) | (46,749) | 0
Fixed maturity securities, available for sale, fair value |  | 31,021,887 |  | 31,156,827 |  |  |
Residential Mortgage Backed Securities |  |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |  |
Fixed maturity securities, available for sale, amortized cost | [1] | 980,838 |  | 1,399,956 |  |  |
Fixed maturity securities, available for sale, gross unrealized gains |  | 75,599 |  | 117,135 |  |  |
Fixed maturity securities, available for sale, gross unrealized losses | [2] | (2,158) |  | (2,526) |  |  |
Fixed maturity securities, available for sale, allowance for credit losses |  | (296) | (120) | (1,734) | (1,221) | (777) | 0
Fixed maturity securities, available for sale, fair value |  | 1,053,983 |  | 1,512,831 |  |  |
Commercial Mortgage Backed Securities |  |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |  |
Fixed maturity securities, available for sale, amortized cost | [1] | 3,963,733 |  | 4,119,650 |  |  |
Fixed maturity securities, available for sale, gross unrealized gains |  | 197,750 |  | 206,255 |  |  |
Fixed maturity securities, available for sale, gross unrealized losses | [2] | (23,405) |  | (64,678) |  |  |
Fixed maturity securities, available for sale, allowance for credit losses |  | 0 | 0 | 0 | (7,353) | (2,660) | 0
Fixed maturity securities, available for sale, fair value |  | 4,138,078 |  | 4,261,227 |  |  |
Other Asset Backed Securities |  |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |  |
Fixed maturity securities, available for sale, amortized cost | [1] | 4,594,511 |  | 5,593,169 |  |  |
Fixed maturity securities, available for sale, gross unrealized gains |  | 102,882 |  | 103,320 |  |  |
Fixed maturity securities, available for sale, gross unrealized losses | [2] | (46,678) |  | (146,640) |  |  |
Fixed maturity securities, available for sale, allowance for credit losses |  | 0 | $ 0 | 0 | $ 0 | $ 0 | $ 0
Fixed maturity securities, available for sale, fair value |  | $ 4,650,715 |  | $ 5,549,849 |  |  |
[1] | Amortized cost excludes accrued interest receivable of $388.4 million and $377.5 million as of September 30, 2021 and December 31, 2020, respectively.
[2] | Gross unrealized losses are net of allowance for credit losses.

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