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Investments (Credit Quality of Fixed Maturity Security Portfolio by NAIC Designation) (Details) - USD ($) $ in Thousands | Mar. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Investment Holdings [Line Items] |  |  |
Fixed maturity securities, available for sale, amortized cost | $ 47,254,063 | [1] | $ 48,238,946
Fixed maturity securities, available for sale, fair value | 47,704,867 |  | 51,580,490
NAIC, Class 1 Designation |  |  |
Investment Holdings [Line Items] |  |  |
Fixed maturity securities, available for sale, amortized cost | 26,309,850 |  | 27,781,525
Fixed maturity securities, available for sale, fair value | 27,739,779 |  | 30,122,657
NAIC, Class 2 Designation |  |  |
Investment Holdings [Line Items] |  |  |
Fixed maturity securities, available for sale, amortized cost | 19,582,082 |  | 19,278,355
Fixed maturity securities, available for sale, fair value | 18,999,760 |  | 20,316,911
NAIC, Class 3 Designation |  |  |
Investment Holdings [Line Items] |  |  |
Fixed maturity securities, available for sale, amortized cost | 1,167,772 |  | 1,001,087
Fixed maturity securities, available for sale, fair value | 838,628 |  | 977,191
NAIC, Class 4 Designation |  |  |
Investment Holdings [Line Items] |  |  |
Fixed maturity securities, available for sale, amortized cost | 128,826 |  | 114,497
Fixed maturity securities, available for sale, fair value | 104,090 |  | 112,534
NAIC, Class 5 Designation |  |  |
Investment Holdings [Line Items] |  |  |
Fixed maturity securities, available for sale, amortized cost | 60,550 |  | 57,952
Fixed maturity securities, available for sale, fair value | 18,433 |  | 45,205
NAIC, Class 6 Designation |  |  |
Investment Holdings [Line Items] |  |  |
Fixed maturity securities, available for sale, amortized cost | 4,983 |  | 5,530
Fixed maturity securities, available for sale, fair value | $ 4,177 |  | $ 5,992
[1] | (1) Amortized cost excludes accrued interest receivable of $456.1 million as of March 31, 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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