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Reinsurance - Allowance for Credit Loss (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Reinsurance Recoverable, Past Due [Line Items]
Reinsurance Recoverable, Allowance for Credit Loss	$ 103	$ 105	$ 99
Operating Segments | Property and Casualty Insurance Subsidiaries
Reinsurance Recoverable, Past Due [Line Items]
Reinsurance Recoverable, Allowance for Credit Loss	100	102	96	$ 105
Reinsurance Recoverable, Credit Loss Expense (Reversal)	3	0	(9)
Reinsurance, Loss on Uncollectible Accounts in Period, Amount	(2)	0	(1)
Operating Segments | Property and Casualty Insurance Subsidiaries | Reinsurance Policy, Type [Axis]: Before Disputed Amounts [Member]
Reinsurance Recoverable, Past Due [Line Items]
Reinsurance Recoverable, Allowance for Credit Loss	43	42	42	52
Operating Segments | Property and Casualty Insurance Subsidiaries | Reinsurance Policy, Type [Axis]: Disputes [Member]
Reinsurance Recoverable, Past Due [Line Items]
Reinsurance Recoverable, Allowance for Credit Loss	57	60	54	$ 53
Operating Segments | Group Insurance Policy [Member]
Reinsurance Recoverable, Past Due [Line Items]
Reinsurance Recoverable, Allowance for Credit Loss	1	1	1
Corporate
Reinsurance Recoverable, Past Due [Line Items]
Reinsurance Recoverable, Allowance for Credit Loss	$ 2	$ 2	$ 2

X

- Definition

Amount of the write-down or write-off of a receivable from a reinsurer.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 13
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479319/326-20-50-13

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X

- Definition

Amount of expense (reversal of expense) for expected credit loss on reinsurance recoverable.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 13
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479319/326-20-50-13

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- 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/2009/role/commonPracticeRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 14
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479319/326-20-50-14

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- Definition

Amount of allowance for credit loss on reinsurance recoverable.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 944
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479838/944-20-50-5

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 944
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-Name Accounting Standards Codification
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-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479616/944-310-45-5

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
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-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479344/326-20-45-1

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
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-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479319/326-20-50-13

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
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-Section 50
-Paragraph 13
-Subparagraph (f)
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-URI https://asc.fasb.org//1943274/2147479319/326-20-50-13

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