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Investments (Schedule of Fixed Maturity Securities) (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Jun. 30, 2020 | [2] | Jan. 01, 2020 | [2] | Dec. 31, 2019
--- | --- | --- | --- | --- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Fixed maturity securities, available for sale, amortized cost | $ 47,132,615 | [1] |  |  | $ 48,238,946
Fixed maturity securities, available for sale, gross unrealized gains | 5,373,658 |  |  |  | 3,633,599
Fixed maturity securities, available for sale, gross unrealized losses | (743,911) |  |  |  | (292,055)
Fixed maturity securities, available for sale, allowance for credit losses | (61,619) |  | $ (50,186) | $ 0 |
Fixed maturity securities, available for sale, fair value | 51,700,743 |  |  |  | 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 | 36,251 | [1] |  |  | 161,492
Fixed maturity securities, available for sale, gross unrealized gains | 2,488 |  |  |  | 369
Fixed maturity securities, available for sale, gross unrealized losses | 0 |  |  |  | (96)
Fixed maturity securities, available for sale, allowance for credit losses | 0 |  |  |  |
Fixed maturity securities, available for sale, fair value | 38,739 |  |  |  | 161,765
United States Government Sponsored Agencies |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Fixed maturity securities, available for sale, amortized cost | 1,024,434 | [1] |  |  | 601,672
Fixed maturity securities, available for sale, gross unrealized gains | 51,216 |  |  |  | 28,133
Fixed maturity securities, available for sale, gross unrealized losses | (672) |  |  |  | (4,785)
Fixed maturity securities, available for sale, allowance for credit losses | 0 |  |  |  |
Fixed maturity securities, available for sale, fair value | 1,074,978 |  |  |  | 625,020
United States Municipalities, States and Territories |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Fixed maturity securities, available for sale, amortized cost | 3,265,276 | [1] |  |  | 4,147,343
Fixed maturity securities, available for sale, gross unrealized gains | 545,676 |  |  |  | 388,578
Fixed maturity securities, available for sale, gross unrealized losses | (5,866) |  |  |  | (8,250)
Fixed maturity securities, available for sale, allowance for credit losses | 0 |  |  |  |
Fixed maturity securities, available for sale, fair value | 3,805,086 |  |  |  | 4,527,671
Foreign Government Obligations |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Fixed maturity securities, available for sale, amortized cost | 187,036 | [1] |  |  | 186,993
Fixed maturity securities, available for sale, gross unrealized gains | 22,605 |  |  |  | 18,103
Fixed maturity securities, available for sale, gross unrealized losses | (408) |  |  |  | 0
Fixed maturity securities, available for sale, allowance for credit losses | 0 |  |  |  |
Fixed maturity securities, available for sale, fair value | 209,233 |  |  |  | 205,096
Corporate Securities |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Fixed maturity securities, available for sale, amortized cost | 29,367,052 | [1] |  |  | 29,822,172
Fixed maturity securities, available for sale, gross unrealized gains | 4,324,910 |  |  |  | 2,796,926
Fixed maturity securities, available for sale, gross unrealized losses | (181,627) |  |  |  | (82,259)
Fixed maturity securities, available for sale, allowance for credit losses | (53,045) |  | (46,749) | 0 |
Fixed maturity securities, available for sale, fair value | 33,457,290 |  |  |  | 32,536,839
Residential Mortgage Backed Securities |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Fixed maturity securities, available for sale, amortized cost | 1,503,212 | [1] |  |  | 1,477,738
Fixed maturity securities, available for sale, gross unrealized gains | 124,849 |  |  |  | 101,617
Fixed maturity securities, available for sale, gross unrealized losses | (3,767) |  |  |  | (3,691)
Fixed maturity securities, available for sale, allowance for credit losses | (1,221) |  | (777) | 0 |
Fixed maturity securities, available for sale, fair value | 1,623,073 |  |  |  | 1,575,664
Commercial Mortgage Backed Securities |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Fixed maturity securities, available for sale, amortized cost | 5,498,757 | [1] |  |  | 5,591,167
Fixed maturity securities, available for sale, gross unrealized gains | 190,102 |  |  |  | 208,895
Fixed maturity securities, available for sale, gross unrealized losses | (202,723) |  |  |  | (13,783)
Fixed maturity securities, available for sale, allowance for credit losses | (7,353) |  | (2,660) | 0 |
Fixed maturity securities, available for sale, fair value | 5,478,783 |  |  |  | 5,786,279
Other Asset Backed Securities |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Fixed maturity securities, available for sale, amortized cost | 6,250,597 | [1] |  |  | 6,250,369
Fixed maturity securities, available for sale, gross unrealized gains | 111,812 |  |  |  | 90,978
Fixed maturity securities, available for sale, gross unrealized losses | (348,848) |  |  |  | (179,191)
Fixed maturity securities, available for sale, allowance for credit losses | 0 |  | $ 0 | $ 0 |
Fixed maturity securities, available for sale, fair value | 6,013,561 |  |  |  | $ 6,162,156
Fixed Maturity Securities, Available For Sale |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Accrued interest receivable | $ 434,300 |  |  |  |
[1] | (1) Amortized cost excludes accrued interest receivable of $434.3 million as of September 30, 2020.
[2] | (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 for further details.

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