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Investments (Credit Quality of Fixed Maturity Security Portfolio by NAIC Designation) (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Investment Holdings [Line Items]
Amortized Cost	$ 43,784,431	$ 44,866,019
Fair Value	39,555,624	39,804,617	[1]
NAIC, Class 1 Designation
Investment Holdings [Line Items]
Amortized Cost	26,409,209	27,061,903
Fair Value	24,052,838	24,211,086
NAIC, Class 2 Designation
Investment Holdings [Line Items]
Amortized Cost	16,575,461	17,023,157
Fair Value	14,833,109	14,944,131
NAIC, Class 3 Designation
Investment Holdings [Line Items]
Amortized Cost	629,526	595,193
Fair Value	537,044	510,392
NAIC, Class 4 Designation
Investment Holdings [Line Items]
Amortized Cost	151,368	109,409
Fair Value	116,504	91,495
NAIC, Class 5 Designation
Investment Holdings [Line Items]
Amortized Cost	7,171	61,721
Fair Value	7,595	36,738
NAIC, Class 6 Designation
Investment Holdings [Line Items]
Amortized Cost	11,696	14,636
Fair Value	$ 8,534	$ 10,775
[1] Certain prior period amounts have been recast. See Note 1 - Significant Accounting Policies for more information.

X

- Definition

Amortized cost excluding accrued interest, before allowance for credit loss, 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
-Section 45
-Paragraph 1
-URI https://asc.fasb.org/extlink&oid=124258926&loc=SL82898722-210454

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Amount excluding accrued interest, 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/2009/role/commonPracticeRef
-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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