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Investments (Schedule of Fixed Maturity Securities) (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Jan. 01, 2020 | [3] | Dec. 31, 2019
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Debt Securities, Available-for-sale [Line Items] |  |  |  |
Fixed maturity securities, available for sale, amortized cost | $ 42,304,736 | [1] |  | $ 48,238,946
Fixed maturity securities, available for sale, gross unrealized gains | 5,549,754 |  |  | 3,633,599
Fixed maturity securities, available for sale, gross unrealized losses | (250,826) | [2] |  | (292,055)
Fixed maturity securities, available for sale, allowance for credit losses | (64,771) |  | $ 0 |
Fixed maturity securities, available for sale, fair value | 47,538,893 |  |  | 51,580,490
United States Government Full Faith and Credit |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Fixed maturity securities, available for sale, amortized cost | 37,471 | [1] |  | 161,492
Fixed maturity securities, available for sale, gross unrealized gains | 2,300 |  |  | 369
Fixed maturity securities, available for sale, gross unrealized losses | 0 | [2] |  | (96)
Fixed maturity securities, available for sale, allowance for credit losses | 0 |  |  |
Fixed maturity securities, available for sale, fair value | 39,771 |  |  | 161,765
United States Government Sponsored Agencies |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Fixed maturity securities, available for sale, amortized cost | 995,465 | [1] |  | 601,672
Fixed maturity securities, available for sale, gross unrealized gains | 44,132 |  |  | 28,133
Fixed maturity securities, available for sale, gross unrealized losses | (46) | [2] |  | (4,785)
Fixed maturity securities, available for sale, allowance for credit losses | 0 |  |  |
Fixed maturity securities, available for sale, fair value | 1,039,551 |  |  | 625,020
United States Municipalities, States and Territories |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Fixed maturity securities, available for sale, amortized cost | 3,236,767 | [1] |  | 4,147,343
Fixed maturity securities, available for sale, gross unrealized gains | 543,252 |  |  | 388,578
Fixed maturity securities, available for sale, gross unrealized losses | (1,044) | [2] |  | (8,250)
Fixed maturity securities, available for sale, allowance for credit losses | (2,844) |  | 0 |
Fixed maturity securities, available for sale, fair value | 3,776,131 |  |  | 4,527,671
Foreign Government Obligations |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Fixed maturity securities, available for sale, amortized cost | 177,062 | [1] |  | 186,993
Fixed maturity securities, available for sale, gross unrealized gains | 25,644 |  |  | 18,103
Fixed maturity securities, available for sale, gross unrealized losses | 0 | [2] |  | 0
Fixed maturity securities, available for sale, allowance for credit losses | 0 |  |  |
Fixed maturity securities, available for sale, fair value | 202,706 |  |  | 205,096
Corporate Securities |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Fixed maturity securities, available for sale, amortized cost | 26,745,196 | [1] |  | 29,822,172
Fixed maturity securities, available for sale, gross unrealized gains | 4,507,716 |  |  | 2,796,926
Fixed maturity securities, available for sale, gross unrealized losses | (35,892) | [2] |  | (82,259)
Fixed maturity securities, available for sale, allowance for credit losses | (60,193) |  | 0 |
Fixed maturity securities, available for sale, fair value | 31,156,827 |  |  | 32,536,839
Residential Mortgage Backed Securities |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Fixed maturity securities, available for sale, amortized cost | 1,399,956 | [1] |  | 1,477,738
Fixed maturity securities, available for sale, gross unrealized gains | 117,135 |  |  | 101,617
Fixed maturity securities, available for sale, gross unrealized losses | (2,526) | [2] |  | (3,691)
Fixed maturity securities, available for sale, allowance for credit losses | (1,734) |  | 0 |
Fixed maturity securities, available for sale, fair value | 1,512,831 |  |  | 1,575,664
Commercial Mortgage Backed Securities |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Fixed maturity securities, available for sale, amortized cost | 4,119,650 | [1] |  | 5,591,167
Fixed maturity securities, available for sale, gross unrealized gains | 206,255 |  |  | 208,895
Fixed maturity securities, available for sale, gross unrealized losses | (64,678) | [2] |  | (13,783)
Fixed maturity securities, available for sale, allowance for credit losses | 0 |  | 0 |
Fixed maturity securities, available for sale, fair value | 4,261,227 |  |  | 5,786,279
Other Asset Backed Securities |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Fixed maturity securities, available for sale, amortized cost | 5,593,169 | [1] |  | 6,250,369
Fixed maturity securities, available for sale, gross unrealized gains | 103,320 |  |  | 90,978
Fixed maturity securities, available for sale, gross unrealized losses | (146,640) | [2] |  | (179,191)
Fixed maturity securities, available for sale, allowance for credit losses | 0 |  | $ 0 |
Fixed maturity securities, available for sale, fair value | 5,549,849 |  |  | $ 6,162,156
Fixed Maturity Securities, Available For Sale |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Accrued interest receivable | $ 377,500 |  |  |
[1] | (1) Amortized cost excludes accrued interest receivable of $377.5 million as of December 31, 2020.
[2] | (2) Gross unrealized losses are net of allowance for credit losses.
[3] | (1) The allowance for credit loss associated with available for sale fixed maturity securities was applied prospectively upon adoption of authoritative guidance effective January 1, 2020. See Note 1 - Significant Accounting Policies for further details.

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