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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

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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).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 30
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-URI http://asc.fasb.org/extlink&oid=118942338&loc=SL82898722-210454

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