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Investments (Credit Quality of Fixed Maturity Security Portfolio by NAIC Designation) (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Investment Holdings [Line Items] |  |  |
Fixed maturity securities, available for sale, amortized cost | $ 47,132,615 | [1] | $ 48,238,946
Fixed maturity securities, available for sale, fair value | 51,700,743 |  | 51,580,490
NAIC, Class 1 Designation |  |  |
Investment Holdings [Line Items] |  |  |
Fixed maturity securities, available for sale, amortized cost | 25,857,683 |  | 27,781,525
Fixed maturity securities, available for sale, fair value | 28,981,733 |  | 30,122,657
NAIC, Class 2 Designation |  |  |
Investment Holdings [Line Items] |  |  |
Fixed maturity securities, available for sale, amortized cost | 18,973,077 |  | 19,278,355
Fixed maturity securities, available for sale, fair value | 20,682,645 |  | 20,316,911
NAIC, Class 3 Designation |  |  |
Investment Holdings [Line Items] |  |  |
Fixed maturity securities, available for sale, amortized cost | 1,844,263 |  | 1,001,087
Fixed maturity securities, available for sale, fair value | 1,684,689 |  | 977,191
NAIC, Class 4 Designation |  |  |
Investment Holdings [Line Items] |  |  |
Fixed maturity securities, available for sale, amortized cost | 300,794 |  | 114,497
Fixed maturity securities, available for sale, fair value | 248,133 |  | 112,534
NAIC, Class 5 Designation |  |  |
Investment Holdings [Line Items] |  |  |
Fixed maturity securities, available for sale, amortized cost | 81,869 |  | 57,952
Fixed maturity securities, available for sale, fair value | 80,048 |  | 45,205
NAIC, Class 6 Designation |  |  |
Investment Holdings [Line Items] |  |  |
Fixed maturity securities, available for sale, amortized cost | 74,929 |  | 5,530
Fixed maturity securities, available for sale, fair value | $ 23,495 |  | $ 5,992
[1] | (1) Amortized cost excludes accrued interest receivable of $434.3 million as of September 30, 2020.

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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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