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Investments (Schedule of Fixed Maturity Securities) (Details) - USD ($) $ in Thousands | Mar. 31, 2020 | Jan. 01, 2020 | [2] | Dec. 31, 2019
--- | --- | --- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Fixed maturity securities, available for sale, amortized cost | $ 47,254,063 | [1] |  | $ 48,238,946
Fixed maturity securities, available for sale, gross unrealized gains | 2,844,086 |  |  | 3,633,599
Fixed maturity securities, available for sale, gross unrealized losses | (2,364,950) |  |  | (292,055)
Fixed maturity securities, available for sale, allowance for credit losses | (28,332) |  | $ 0 |
Fixed maturity securities, available for sale, fair value | 47,704,867 |  |  | 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 | 36,501 | [1] |  | 161,492
Fixed maturity securities, available for sale, gross unrealized gains | 2,747 |  |  | 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 | 39,248 |  |  | 161,765
United States Government Sponsored Agencies |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Fixed maturity securities, available for sale, amortized cost | 293,722 | [1] |  | 601,672
Fixed maturity securities, available for sale, gross unrealized gains | 44,839 |  |  | 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 | 338,561 |  |  | 625,020
United States Municipalities, States and Territories |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Fixed maturity securities, available for sale, amortized cost | 3,357,142 | [1] |  | 4,147,343
Fixed maturity securities, available for sale, gross unrealized gains | 412,151 |  |  | 388,578
Fixed maturity securities, available for sale, gross unrealized losses | (4,130) |  |  | (8,250)
Fixed maturity securities, available for sale, allowance for credit losses | 0 |  |  |
Fixed maturity securities, available for sale, fair value | 3,765,163 |  |  | 4,527,671
Foreign Government Obligations |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Fixed maturity securities, available for sale, amortized cost | 187,007 | [1] |  | 186,993
Fixed maturity securities, available for sale, gross unrealized gains | 15,854 |  |  | 18,103
Fixed maturity securities, available for sale, gross unrealized losses | (4,465) |  |  | 0
Fixed maturity securities, available for sale, allowance for credit losses | 0 |  |  |
Fixed maturity securities, available for sale, fair value | 198,396 |  |  | 205,096
Corporate Securities |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Fixed maturity securities, available for sale, amortized cost | 29,879,520 | [1] |  | 29,822,172
Fixed maturity securities, available for sale, gross unrealized gains | 2,111,969 |  |  | 2,796,926
Fixed maturity securities, available for sale, gross unrealized losses | (827,838) |  |  | (82,259)
Fixed maturity securities, available for sale, allowance for credit losses | (28,332) |  | 0 |
Fixed maturity securities, available for sale, fair value | 31,135,319 |  |  | 32,536,839
Residential Mortgage Backed Securities |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Fixed maturity securities, available for sale, amortized cost | 1,671,466 | [1] |  | 1,477,738
Fixed maturity securities, available for sale, gross unrealized gains | 118,172 |  |  | 101,617
Fixed maturity securities, available for sale, gross unrealized losses | (24,605) |  |  | (3,691)
Fixed maturity securities, available for sale, allowance for credit losses | 0 |  |  |
Fixed maturity securities, available for sale, fair value | 1,765,033 |  |  | 1,575,664
Commercial Mortgage Backed Securities |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Fixed maturity securities, available for sale, amortized cost | 5,540,607 | [1] |  | 5,591,167
Fixed maturity securities, available for sale, gross unrealized gains | 66,402 |  |  | 208,895
Fixed maturity securities, available for sale, gross unrealized losses | (310,897) |  |  | (13,783)
Fixed maturity securities, available for sale, allowance for credit losses | 0 |  | 0 |
Fixed maturity securities, available for sale, fair value | 5,296,112 |  |  | 5,786,279
Other Asset Backed Securities |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Fixed maturity securities, available for sale, amortized cost | 6,288,098 | [1] |  | 6,250,369
Fixed maturity securities, available for sale, gross unrealized gains | 71,952 |  |  | 90,978
Fixed maturity securities, available for sale, gross unrealized losses | (1,193,015) |  |  | (179,191)
Fixed maturity securities, available for sale, allowance for credit losses | 0 |  | $ 0 |
Fixed maturity securities, available for sale, fair value | 5,167,035 |  |  | $ 6,162,156
Fixed Maturity Securities, Available For Sale |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Accrued interest receivable | $ 456,100 |  |  |
[1] | (1) Amortized cost excludes accrued interest receivable of $456.1 million as of March 31, 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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