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Investments (Credit Quality of Fixed Maturity Security Portfolio by NAIC Designation) (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Investment Holdings [Line Items] |  |  |
Fixed maturity securities, available for sale, amortized cost | [1] | $ 42,114,459 | $ 42,304,736
Fixed maturity securities, available for sale, fair value |  | 45,690,341 | 47,538,893
NAIC, Class 1 Designation |  |  |
Investment Holdings [Line Items] |  |  |
Fixed maturity securities, available for sale, amortized cost |  | 23,074,878 | 23,330,149
Fixed maturity securities, available for sale, fair value |  | 25,301,796 | 26,564,542
NAIC, Class 2 Designation |  |  |
Investment Holdings [Line Items] |  |  |
Fixed maturity securities, available for sale, amortized cost |  | 17,431,710 | 17,312,485
Fixed maturity securities, available for sale, fair value |  | 18,833,794 | 19,377,013
NAIC, Class 3 Designation |  |  |
Investment Holdings [Line Items] |  |  |
Fixed maturity securities, available for sale, amortized cost |  | 1,305,190 | 1,292,124
Fixed maturity securities, available for sale, fair value |  | 1,310,371 | 1,299,455
NAIC, Class 4 Designation |  |  |
Investment Holdings [Line Items] |  |  |
Fixed maturity securities, available for sale, amortized cost |  | 209,974 | 282,049
Fixed maturity securities, available for sale, fair value |  | 189,560 | 256,651
NAIC, Class 5 Designation |  |  |
Investment Holdings [Line Items] |  |  |
Fixed maturity securities, available for sale, amortized cost |  | 40,511 | 29,396
Fixed maturity securities, available for sale, fair value |  | 27,540 | 16,288
NAIC, Class 6 Designation |  |  |
Investment Holdings [Line Items] |  |  |
Fixed maturity securities, available for sale, amortized cost |  | 52,196 | 58,533
Fixed maturity securities, available for sale, fair value |  | $ 27,280 | $ 24,944
[1] | Amortized cost excludes accrued interest receivable of $389.2 million and $377.5 million as of March 31, 2021 and December 31, 2020, respectively.

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- Definition Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27161-111563 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=118942338&loc=SL82898722-210454 + Details
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