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Investments (Credit Quality of Fixed Maturity Security Portfolio by NAIC Designation) (Details) - USD ($) $ in Thousands		Jun. 30, 2022	Dec. 31, 2021
Investment Holdings [Line Items]
Fixed maturity securities, available for sale, amortized cost		$ 48,468,027	$ 46,999,183
Fixed maturity securities, available for sale, fair value		45,323,775	51,305,943
Fixed Maturity Securities, Available For Sale, Excluding Modified Coinsurance Investments
Investment Holdings [Line Items]
Fixed maturity securities, available for sale, amortized cost	[1]	45,981,989
Fixed maturity securities, available for sale, fair value	[1]	43,238,083
Fixed Maturity Securities, Available For Sale, Modified Coinsurance Investments
Investment Holdings [Line Items]
Fixed maturity securities, available for sale, amortized cost		2,486,038
Fixed maturity securities, available for sale, fair value		2,085,692
NAIC, Class 1 Designation
Investment Holdings [Line Items]
Fixed maturity securities, available for sale, amortized cost			26,157,531
Fixed maturity securities, available for sale, fair value			28,785,839
NAIC, Class 1 Designation | Fixed Maturity Securities, Available For Sale, Excluding Modified Coinsurance Investments
Investment Holdings [Line Items]
Fixed maturity securities, available for sale, amortized cost	[1]	26,879,226
Fixed maturity securities, available for sale, fair value	[1]	25,453,818
NAIC, Class 2 Designation
Investment Holdings [Line Items]
Fixed maturity securities, available for sale, amortized cost			19,758,594
Fixed maturity securities, available for sale, fair value			21,396,020
NAIC, Class 2 Designation | Fixed Maturity Securities, Available For Sale, Excluding Modified Coinsurance Investments
Investment Holdings [Line Items]
Fixed maturity securities, available for sale, amortized cost	[1]	18,180,556
Fixed maturity securities, available for sale, fair value	[1]	16,967,885
NAIC, Class 3 Designation
Investment Holdings [Line Items]
Fixed maturity securities, available for sale, amortized cost			909,311
Fixed maturity securities, available for sale, fair value			941,210
NAIC, Class 3 Designation | Fixed Maturity Securities, Available For Sale, Excluding Modified Coinsurance Investments
Investment Holdings [Line Items]
Fixed maturity securities, available for sale, amortized cost	[1]	706,018
Fixed maturity securities, available for sale, fair value	[1]	630,715
NAIC, Class 4 Designation
Investment Holdings [Line Items]
Fixed maturity securities, available for sale, amortized cost			133,070
Fixed maturity securities, available for sale, fair value			147,160
NAIC, Class 4 Designation | Fixed Maturity Securities, Available For Sale, Excluding Modified Coinsurance Investments
Investment Holdings [Line Items]
Fixed maturity securities, available for sale, amortized cost	[1]	124,688
Fixed maturity securities, available for sale, fair value	[1]	117,336
NAIC, Class 5 Designation
Investment Holdings [Line Items]
Fixed maturity securities, available for sale, amortized cost			16,496
Fixed maturity securities, available for sale, fair value			15,357
NAIC, Class 5 Designation | Fixed Maturity Securities, Available For Sale, Excluding Modified Coinsurance Investments
Investment Holdings [Line Items]
Fixed maturity securities, available for sale, amortized cost	[1]	56,931
Fixed maturity securities, available for sale, fair value	[1]	40,995
NAIC, Class 6 Designation
Investment Holdings [Line Items]
Fixed maturity securities, available for sale, amortized cost			24,181
Fixed maturity securities, available for sale, fair value			$ 20,357
NAIC, Class 6 Designation | Fixed Maturity Securities, Available For Sale, Excluding Modified Coinsurance Investments
Investment Holdings [Line Items]
Fixed maturity securities, available for sale, amortized cost	[1]	34,570
Fixed maturity securities, available for sale, fair value	[1]	$ 27,334
[1] Excludes fixed maturity securities related to reinsurance business ceded under a modified coinsurance agreement with a fair value of $2,085,692 and an amortized cost of $2,486,038.

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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 https://asc.fasb.org/extlink&oid=126970911&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 https://asc.fasb.org/extlink&oid=124258926&loc=SL82898722-210454

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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 210
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