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Reinsurance - Additional Information (Details) - USD ($) $ in Millions	12 Months Ended			72 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2022
Reinsurance, Loss on Uncollectible Accounts in Period, Amount	$ 0	$ (1)	$ 0
Asbestos and Environmental
Policyholder Benefits and Claims Incurred, Ceded			220	$ 1,244
Reinsurance, Excess Retention, Amount Reinsured, Per Policy	256
Reinsurance Policy, Type [Axis]: Adverse Development Cover Navigators Group
Policyholder Benefits and Claims Incurred, Ceded	300
Reinsurance Policy, Type [Axis]: Adverse Development Cover Navigators Group | Remaining [Member]
Reinsurance, Excess Retention, Amount Reinsured, Per Policy	0
Reinsurance Policy, Type [Axis]: Asbestos and Environmental
Policyholder Benefits and Claims Incurred, Ceded			220
Reinsurance Policy, Type [Axis]: Asbestos and Environmental | Asbestos and Environmental
Policyholder Benefits and Claims Incurred, Ceded	1,244
Reinsurance Policy, Type [Axis]: Asbestos and Environmental | Remaining [Member] | Asbestos and Environmental
Reinsurance, Excess Retention, Amount Reinsured, Per Policy	256
Maximum | Asbestos and Environmental
Reinsurance, Excess Retention, Amount Reinsured, Per Policy	1,500
Maximum | Reinsurance Policy, Type [Axis]: Adverse Development Cover Navigators Group
Reinsurance, Excess Retention, Amount Reinsured, Per Policy	300
Maximum | Reinsurance Policy, Type [Axis]: Asbestos and Environmental | Asbestos and Environmental
Reinsurance, Excess Retention, Amount Reinsured, Per Policy	1,500
Maximum | The Navigators Group, Inc. [Member] | Reinsurance Policy, Type [Axis]: Adverse Development Cover Navigators Group
Reinsurance, Excess Retention, Amount Reinsured, Per Policy	300
Property and Casualty Insurance Products
Policyholder Benefits and Claims Incurred, Ceded	1,338	1,243	1,156
Group Insurance Policy [Member]
Policyholder Benefits and Claims Incurred, Ceded	$ 81	$ 85	$ 63

X

- Definition

Amount of reduction of provision for policy benefits and costs incurred for policies ceded.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 20
-Section 50
-Paragraph 3
-URI https://asc.fasb.org/extlink&oid=99397103&loc=d3e6811-158387

+ Details

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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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 13
-Subparagraph (d)
-URI https://asc.fasb.org/extlink&oid=124255953&loc=SL82919249-210447

+ Details

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X

- Definition

Amount per policy of risk ceded to reinsurer in excess of risk undertaken originally by insurer that is not ceded to reinsurer.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 20
-Section 50
-Paragraph 3
-URI https://asc.fasb.org/extlink&oid=99397103&loc=d3e6811-158387

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