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Investments (Credit Quality of Fixed Maturity Security Portfolio by NAIC Designation) (Details) - USD ($) $ in Thousands | Jun. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Investment Holdings [Line Items] |  |  |
Fixed maturity securities, available for sale, amortized cost | $ 46,951,043 | [1] | $ 48,238,946
Fixed maturity securities, available for sale, fair value | 50,738,792 |  | 51,580,490
NAIC, Class 1 Designation |  |  |
Investment Holdings [Line Items] |  |  |
Fixed maturity securities, available for sale, amortized cost | 25,587,355 |  | 27,781,525
Fixed maturity securities, available for sale, fair value | 28,327,288 |  | 30,122,657
NAIC, Class 2 Designation |  |  |
Investment Holdings [Line Items] |  |  |
Fixed maturity securities, available for sale, amortized cost | 19,487,757 |  | 19,278,355
Fixed maturity securities, available for sale, fair value | 20,765,334 |  | 20,316,911
NAIC, Class 3 Designation |  |  |
Investment Holdings [Line Items] |  |  |
Fixed maturity securities, available for sale, amortized cost | 1,577,056 |  | 1,001,087
Fixed maturity securities, available for sale, fair value | 1,430,998 |  | 977,191
NAIC, Class 4 Designation |  |  |
Investment Holdings [Line Items] |  |  |
Fixed maturity securities, available for sale, amortized cost | 185,879 |  | 114,497
Fixed maturity securities, available for sale, fair value | 156,234 |  | 112,534
NAIC, Class 5 Designation |  |  |
Investment Holdings [Line Items] |  |  |
Fixed maturity securities, available for sale, amortized cost | 51,893 |  | 57,952
Fixed maturity securities, available for sale, fair value | 31,644 |  | 45,205
NAIC, Class 6 Designation |  |  |
Investment Holdings [Line Items] |  |  |
Fixed maturity securities, available for sale, amortized cost | 61,103 |  | 5,530
Fixed maturity securities, available for sale, fair value | $ 27,294 |  | $ 5,992
[1] | (1) Amortized cost excludes accrued interest receivable of $432.0 million as of June 30, 2020.

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