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Reserve for Unpaid Losses and Loss Adjustment Expenses - Prior Accident Years Reserve Development (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Reinsurance Policy, Type [Axis]: Adverse Development Cover Navigators Group |  |  |
Prior accident years reserve development |  |  |
Change in Deferred Gain on Retroactive Reinsurance | $ 145 | $ 0 | $ 0
Reinsurance Policy, Type [Axis]: Adverse Development Cover Navigators Group | Remaining [Member] |  |  |
Prior accident years reserve development |  |  |
Reinsurance, Excess Retention, Amount Reinsured, Per Policy | 0 |  |
Asbestos and Environmental |  |  |
Prior accident years reserve development |  |  |
Change in Deferred Gain on Retroactive Reinsurance | 62 | 194 | 229
Liability for Asbestos and Environmental Claims, Gross, Period Increase (Decrease) | 203 | 194 | 229
Asbestos and Environmental | Reinsurance Policy, Type [Axis]: Asbestos and Environmental | Remaining [Member] |  |  |
Prior accident years reserve development |  |  |
Reinsurance, Excess Retention, Amount Reinsured, Per Policy | 0 |  |
Net asbestos reserves |  |  |
Prior accident years reserve development |  |  |
Prior accident year development [1] | 167 | 156 | 162
Net environmental reserves |  |  |
Prior accident years reserve development |  |  |
Prior accident year development [1] | 36 | 38 | 67
Property and Casualty Insurance Products |  |  |
Prior accident years reserve development |  |  |
Prior accident year development [1] | (120) | 10 | 36
Prior Year Claims and Claims Adjustment Expense, net of retroactive reinsurance benefit | (37) | (184) | (193)
Property and Casualty Insurance Products | Reinsurance Policy, Type [Axis]: Adverse Development Covers |  |  |
Prior accident years reserve development |  |  |
Change in Deferred Gain on Retroactive Reinsurance | (83) | 194 | 229
Segment Reconciling Items |  |  |
Prior accident years reserve development |  |  |
Change in Deferred Gain on Retroactive Reinsurance | (83) | 194 | 229
Segment Reconciling Items | Catastrophes |  |  |
Prior accident years reserve development |  |  |
Prior accident year development [1] | (87) | (87) | (62)
Segment Reconciling Items | Asbestos and Environmental |  |  |
Prior accident years reserve development |  |  |
Prior accident year development [1] | 141 | 0 | 0
Segment Reconciling Items | Workers' Compensation |  |  |
Prior accident years reserve development |  |  |
Prior accident year development [1] | (258) | (236) | (204)
Segment Reconciling Items | Workers' Compensation | COVID-19 related Claims |  |  |
Prior accident years reserve development |  |  |
Prior accident year development [1] | (48) | (38) | (14)
Segment Reconciling Items | Workers’ compensation discount accretion |  |  |
Prior accident years reserve development |  |  |
Prior accident year development [1] | 44 | 42 | 36
Segment Reconciling Items | General liability |  |  |
Prior accident years reserve development |  |  |
Prior accident year development [1] | 211 | 41 | 56
Segment Reconciling Items | Marine [Member] |  |  |
Prior accident years reserve development |  |  |
Prior accident year development [1] | (1) | (2) | 2
Segment Reconciling Items | Package Business [Member] |  |  |
Prior accident years reserve development |  |  |
Prior accident year development [1] | (6) | (24) | (39)
Segment Reconciling Items | Property Insurance [Member] | P&C Business Insurance [Member] |  |  |
Prior accident years reserve development |  |  |
Prior accident year development [1] | (7) | (7) | (11)
Segment Reconciling Items | Property Insurance [Member] | P&C Personal Insurance [Member] |  |  |
Prior accident years reserve development |  |  |
Prior accident year development [1] | (28) | (6) | (1)
Segment Reconciling Items | Professional liability |  |  |
Prior accident years reserve development |  |  |
Prior accident year development [1] | (27) | (2) | (11)
Segment Reconciling Items | Surety Product Line [Member] |  |  |
Prior accident years reserve development |  |  |
Prior accident year development [1] | (56) | (27) | (32)
Segment Reconciling Items | Assumed Reinsurance [Member] |  |  |
Prior accident years reserve development |  |  |
Prior accident year development [1] | 24 | 34 | 19
Segment Reconciling Items | Automobile liability | P&C Business Insurance [Member] |  |  |
Prior accident years reserve development |  |  |
Prior accident year development [1] | 47 | 20 | 38
Segment Reconciling Items | Automobile liability | P&C Personal Insurance [Member] |  |  |
Prior accident years reserve development |  |  |
Prior accident year development [1] | (30) | 0 | (14)
Segment Reconciling Items | Uncollectible reinsurance |  |  |
Prior accident years reserve development |  |  |
Prior accident year development [1] | (19) | 13 | 3
Segment Reconciling Items | Insurance, Other [Member] |  |  |
Prior accident years reserve development |  |  |
Prior accident year development [1] | $ 15 | $ 57 | $ 27

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- Definition Prior Year Claims and Claims Adjustment Expense, net of retroactive reinsurance benefit + References No definition available. + Details
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- Definition Amount of increase (decrease) in deferred income and obligation to transfer product and service to customer for which consideration has been received or is receivable. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name Accounting Standards Codification -Section 45 -Paragraph 28 -Subparagraph (a) -SubTopic 10 -Topic 230 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-28 + Details
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- Definition The increase (decrease) during the reporting period in asbestos and environmental claims reserve, before estimated recoveries from reinsurers. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480081/944-40-50-3 + 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 -Topic 944 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479838/944-20-50-3 + Details
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- Definition Amount, after effects of reinsurance, of expense (reversal of expense) for claims incurred in prior reporting periods and related claims settlement costs. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 55 -Paragraph 7 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480046/944-40-55-7 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480081/944-40-50-3 + Details
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