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SCHEDULE I — SUMMARY OF INVESTMENTS — OTHER THAN INVESTMENTS IN RELATED PARTIES (Details) $ in Millions	Dec. 31, 2023 USD ($)
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Cost	$ 37,980
Market Value	37,141
Amount Shown in Balance Sheet	37,142
Available For Sale
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Cost	28,568
Market Value	27,740
Amount Shown in Balance Sheet	27,740
Held-to-Maturity
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Cost	864
Market Value	854
Amount Shown in Balance Sheet	855
U.S. government agencies and corporations | Available For Sale
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Cost	1,045
Market Value	996
Amount Shown in Balance Sheet	996
State, municipalities and political subdivisions | Available For Sale
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Cost	138
Market Value	128
Amount Shown in Balance Sheet	128
Foreign government securities | Available For Sale
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Cost	2,042
Market Value	1,967
Amount Shown in Balance Sheet	1,967
Foreign corporate securities | Available For Sale
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Cost	5,720
Market Value	5,540
Amount Shown in Balance Sheet	5,540
Foreign corporate securities | Held-to-Maturity
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Cost	84
Market Value	90
Amount Shown in Balance Sheet	83
Public utilities | Available For Sale
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Cost	554
Market Value	528
Amount Shown in Balance Sheet	528
Public utilities | Held-to-Maturity
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Cost	4
Market Value	5
Amount Shown in Balance Sheet	4
All other corporate bonds | Available For Sale
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Cost	12,204
Market Value	12,016
Amount Shown in Balance Sheet	12,016
All other corporate bonds | Held-to-Maturity
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Cost	754
Market Value	738
Amount Shown in Balance Sheet	747
Commercial | Available For Sale
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Cost	1,091
Market Value	1,000
Amount Shown in Balance Sheet	1,000
Commercial | Held-to-Maturity
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Cost	21
Market Value	21
Amount Shown in Balance Sheet	21
Agency residential | Available For Sale
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Cost	4,869
Market Value	4,695
Amount Shown in Balance Sheet	4,695
Non-agency residential | Available For Sale
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Cost	431
Market Value	443
Amount Shown in Balance Sheet	443
Redeemable preferred stock | Available For Sale
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Cost	474
Market Value	427
Amount Shown in Balance Sheet	427
Equity securities:
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Cost	190
Market Value	188
Amount Shown in Balance Sheet	188
Short-term investments gain (loss)
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Cost	2,127
Market Value	2,127
Amount Shown in Balance Sheet	2,127
Other invested assets
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Cost	4,794
Market Value	4,794
Amount Shown in Balance Sheet	4,794
Cash
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Cost	1,437
Market Value	1,437
Amount Shown in Balance Sheet	$ 1,437

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name Regulation S-X (SX)
-Number 210
-Section 12
-Subsection 15
-Publisher SEC

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 320
-Name Accounting Standards Codification
-Section S99
-Paragraph 7
-Subparagraph (SX 210.12-15)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480032/946-320-S99-7

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Amount of investment held by insurance company, excluding investment in related party.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 320
-Name Accounting Standards Codification
-Section S99
-Paragraph 7
-Subparagraph (SX 210.12-15(Column D))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480032/946-320-S99-7

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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-SubTopic 320
-Name Accounting Standards Codification
-Section S99
-Paragraph 7
-Subparagraph (SX 210.12-15(Column B))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480032/946-320-S99-7

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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-SubTopic 320
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-Section S99
-Paragraph 7
-Subparagraph (SX 210.12-15(Column C))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480032/946-320-S99-7

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