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Reinsurance - Additional Information (Details) - USD ($) $ in Millions | 12 Months Ended | 60 Months Ended
--- | --- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2021
Reinsurance, Loss on Uncollectible Accounts in Period, Amount | $ (1) | $ 0 |  |
Asbestos and Environmental |  |  |  |
Policyholder Benefits and Claims Incurred, Ceded |  | 220 |  | $ 1,015
Reinsurance Retention Policy, Excess Retention, Amount Reinsured | 485 |  |  |
Adverse Development Cover Navigators Group [Member] |  |  |  |
Policyholder Benefits and Claims Incurred, Ceded | 300 |  |  |
Adverse Development Cover Navigators Group [Member] | Remaining [Member] |  |  |  |
Reinsurance Retention Policy, Excess Retention, Amount Reinsured | 0 |  |  |
Asbestos and Environmental |  |  |  |
Policyholder Benefits and Claims Incurred, Ceded |  | 220 |  |
Asbestos and Environmental | Asbestos and Environmental |  |  |  |
Policyholder Benefits and Claims Incurred, Ceded | 1,015 |  |  |
Asbestos and Environmental | Remaining [Member] | Asbestos and Environmental |  |  |  |
Reinsurance Retention Policy, Excess Retention, Amount Reinsured | 485 |  |  |
The Navigators Group, Inc. [Member] | Adverse Development Cover Navigators Group [Member] |  |  |  |
Policyholder Benefits and Claims Incurred, Ceded |  |  | $ 91 |
Maximum | Asbestos and Environmental |  |  |  |
Reinsurance Retention Policy, Excess Retention, Amount Reinsured | 1,500 |  |  |
Maximum | Adverse Development Cover Navigators Group [Member] |  |  |  |
Reinsurance Retention Policy, Excess Retention, Amount Reinsured | 300 |  |  |
Maximum | Asbestos and Environmental | Asbestos and Environmental |  |  |  |
Reinsurance Retention Policy, Excess Retention, Amount Reinsured | 1,500 |  |  |
Maximum | The Navigators Group, Inc. [Member] | Adverse Development Cover Navigators Group [Member] |  |  |  |
Reinsurance Retention Policy, Excess Retention, Amount Reinsured |  |  | 300 |
Property and Casualty Insurance Products |  |  |  |
Policyholder Benefits and Claims Incurred, Ceded | 1,243 | 1,156 | 826 |
Group Insurance Policy [Member] |  |  |  |
Policyholder Benefits and Claims Incurred, Ceded | $ 85 | $ 63 | $ 73 |

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- 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 http://asc.fasb.org/extlink&oid=99397103&loc=d3e6811-158387 + Details
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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 http://asc.fasb.org/extlink&oid=124255953&loc=SL82919249-210447 + Details
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