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Investments (Schedule of Fixed Maturity Securities) (Details) - USD ($) $ in Thousands | Jun. 30, 2020 | Mar. 31, 2020 | [2] | Jan. 01, 2020 | [2] | Dec. 31, 2019
--- | --- | --- | --- | --- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Fixed maturity securities, available for sale, amortized cost | $ 46,951,043 | [1] |  |  | $ 48,238,946
Fixed maturity securities, available for sale, gross unrealized gains | 4,825,626 |  |  |  | 3,633,599
Fixed maturity securities, available for sale, gross unrealized losses | (987,691) |  |  |  | (292,055)
Fixed maturity securities, available for sale, allowance for credit losses | (50,186) |  | $ (28,332) | $ 0 |
Fixed maturity securities, available for sale, fair value | 50,738,792 |  |  |  | 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 | 36,507 | [1] |  |  | 161,492
Fixed maturity securities, available for sale, gross unrealized gains | 2,835 |  |  |  | 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 | 39,342 |  |  |  | 161,765
United States Government Sponsored Agencies |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Fixed maturity securities, available for sale, amortized cost | 293,731 | [1] |  |  | 601,672
Fixed maturity securities, available for sale, gross unrealized gains | 49,656 |  |  |  | 28,133
Fixed maturity securities, available for sale, gross unrealized losses | 0 |  |  |  | (4,785)
Fixed maturity securities, available for sale, allowance for credit losses | 0 |  |  |  |
Fixed maturity securities, available for sale, fair value | 343,387 |  |  |  | 625,020
United States Municipalities, States and Territories |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Fixed maturity securities, available for sale, amortized cost | 3,283,321 | [1] |  |  | 4,147,343
Fixed maturity securities, available for sale, gross unrealized gains | 497,428 |  |  |  | 388,578
Fixed maturity securities, available for sale, gross unrealized losses | (2,039) |  |  |  | (8,250)
Fixed maturity securities, available for sale, allowance for credit losses | 0 |  |  |  |
Fixed maturity securities, available for sale, fair value | 3,778,710 |  |  |  | 4,527,671
Foreign Government Obligations |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Fixed maturity securities, available for sale, amortized cost | 187,021 | [1] |  |  | 186,993
Fixed maturity securities, available for sale, gross unrealized gains | 21,616 |  |  |  | 18,103
Fixed maturity securities, available for sale, gross unrealized losses | (1,128) |  |  |  | 0
Fixed maturity securities, available for sale, allowance for credit losses | 0 |  |  |  |
Fixed maturity securities, available for sale, fair value | 207,509 |  |  |  | 205,096
Corporate Securities |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Fixed maturity securities, available for sale, amortized cost | 29,734,789 | [1] |  |  | 29,822,172
Fixed maturity securities, available for sale, gross unrealized gains | 3,889,518 |  |  |  | 2,796,926
Fixed maturity securities, available for sale, gross unrealized losses | (246,847) |  |  |  | (82,259)
Fixed maturity securities, available for sale, allowance for credit losses | (46,749) |  | (28,332) | 0 |
Fixed maturity securities, available for sale, fair value | 33,330,711 |  |  |  | 32,536,839
Residential Mortgage Backed Securities |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Fixed maturity securities, available for sale, amortized cost | 1,588,760 | [1] |  |  | 1,477,738
Fixed maturity securities, available for sale, gross unrealized gains | 129,579 |  |  |  | 101,617
Fixed maturity securities, available for sale, gross unrealized losses | (4,837) |  |  |  | (3,691)
Fixed maturity securities, available for sale, allowance for credit losses | (777) |  | 0 | 0 |
Fixed maturity securities, available for sale, fair value | 1,712,725 |  |  |  | 1,575,664
Commercial Mortgage Backed Securities |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Fixed maturity securities, available for sale, amortized cost | 5,524,081 | [1] |  |  | 5,591,167
Fixed maturity securities, available for sale, gross unrealized gains | 138,590 |  |  |  | 208,895
Fixed maturity securities, available for sale, gross unrealized losses | (266,949) |  |  |  | (13,783)
Fixed maturity securities, available for sale, allowance for credit losses | (2,660) |  | 0 | 0 |
Fixed maturity securities, available for sale, fair value | 5,393,062 |  |  |  | 5,786,279
Other Asset Backed Securities |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Fixed maturity securities, available for sale, amortized cost | 6,302,833 | [1] |  |  | 6,250,369
Fixed maturity securities, available for sale, gross unrealized gains | 96,404 |  |  |  | 90,978
Fixed maturity securities, available for sale, gross unrealized losses | (465,891) |  |  |  | (179,191)
Fixed maturity securities, available for sale, allowance for credit losses | 0 |  | $ 0 | $ 0 |
Fixed maturity securities, available for sale, fair value | 5,933,346 |  |  |  | $ 6,162,156
Fixed Maturity Securities, Available For Sale |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Accrued interest receivable | $ 432,000 |  |  |  |
[1] | (1) Amortized cost excludes accrued interest receivable of $432.0 million as of June 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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