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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 |

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- 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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- 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 + Details
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