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Investments (Credit Quality of Fixed Maturity Security Portfolio by NAIC Designation) (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Investment Holdings [Line Items] |  |  |
Available for sale securities, amortized cost | $ 42,304,736 | [1] | $ 48,238,946
Fixed maturity securities, available for sale, fair value | 47,538,893 |  | 51,580,490
NAIC, Class 1 Designation |  |  |
Investment Holdings [Line Items] |  |  |
Available for sale securities, amortized cost | 23,330,149 |  | 27,781,525
Fixed maturity securities, available for sale, fair value | 26,564,542 |  | 30,122,657
NAIC, Class 2 Designation |  |  |
Investment Holdings [Line Items] |  |  |
Available for sale securities, amortized cost | 17,312,485 |  | 19,278,355
Fixed maturity securities, available for sale, fair value | 19,377,013 |  | 20,316,911
NAIC, Class 3 Designation |  |  |
Investment Holdings [Line Items] |  |  |
Available for sale securities, amortized cost | 1,292,124 |  | 1,001,087
Fixed maturity securities, available for sale, fair value | 1,299,455 |  | 977,191
NAIC, Class 4 Designation |  |  |
Investment Holdings [Line Items] |  |  |
Available for sale securities, amortized cost | 282,049 |  | 114,497
Fixed maturity securities, available for sale, fair value | 256,651 |  | 112,534
NAIC, Class 5 Designation |  |  |
Investment Holdings [Line Items] |  |  |
Available for sale securities, amortized cost | 29,396 |  | 57,952
Fixed maturity securities, available for sale, fair value | 16,288 |  | 45,205
NAIC, Class 6 Designation |  |  |
Investment Holdings [Line Items] |  |  |
Available for sale securities, amortized cost | 58,533 |  | 5,530
Fixed maturity securities, available for sale, fair value | $ 24,944 |  | $ 5,992
[1] | (1) Amortized cost excludes accrued interest receivable of $377.5 million as of December 31, 2020.

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