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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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- 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
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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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