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Reserve for Unpaid Losses and Loss Adjustment Expenses (Details) $ in Millions | 3 Months Ended
--- | ---
Dec. 31, 2024 USD ($)
Asbestos and Environmental |
Liability for Claims and Claims Adjustment Expense [Line Items] |
Increase (Decrease) in Deferred Revenue | $ 62
Liability for Asbestos and Environmental Claims, Gross, Period Increase (Decrease) | 203
Asbestos and Environmental | Maximum | Reinsurance Contract [Axis]: Asbestos and Environmental |
Liability for Claims and Claims Adjustment Expense [Line Items] |
Reinsurance, Excess Retention, Amount Reinsured, Per Policy | 1,500
Navigator's ADC |
Liability for Claims and Claims Adjustment Expense [Line Items] |
Increase (Decrease) in Deferred Revenue | 58
Asbestos Issue |
Liability for Claims and Claims Adjustment Expense [Line Items] |
Prior Year Claims and Claims Adjustment Expense | 167
Environmental Issue |
Liability for Claims and Claims Adjustment Expense [Line Items] |
Prior Year Claims and Claims Adjustment Expense | 36
Property, Liability and Casualty Insurance Product Line |
Liability for Claims and Claims Adjustment Expense [Line Items] |
Prior Year Claims and Claims Adjustment Expense | 101
Supplemental Information for Property Casualty Insurance Underwriters Prior Year Claims and Claims Adjustment Expense, net of retroactive reinsurance benefit | 97
Segment Reporting, Reconciling Item, Excluding Corporate Nonsegment |
Liability for Claims and Claims Adjustment Expense [Line Items] |
Increase (Decrease) in Deferred Revenue | 4
Segment Reporting, Reconciling Item, Excluding Corporate Nonsegment | Catastrophe |
Liability for Claims and Claims Adjustment Expense [Line Items] |
Prior Year Claims and Claims Adjustment Expense | (49)
Segment Reporting, Reconciling Item, Excluding Corporate Nonsegment | Asbestos and Environmental |
Liability for Claims and Claims Adjustment Expense [Line Items] |
Prior Year Claims and Claims Adjustment Expense | 141
Segment Reporting, Reconciling Item, Excluding Corporate Nonsegment | Change in Workers Compensation Discount Including Accretion |
Liability for Claims and Claims Adjustment Expense [Line Items] |
Prior Year Claims and Claims Adjustment Expense | 10
Segment Reporting, Reconciling Item, Excluding Corporate Nonsegment | General Liability |
Liability for Claims and Claims Adjustment Expense [Line Items] |
Prior Year Claims and Claims Adjustment Expense | 130
Segment Reporting, Reconciling Item, Excluding Corporate Nonsegment | Marine |
Liability for Claims and Claims Adjustment Expense [Line Items] |
Prior Year Claims and Claims Adjustment Expense | 0
Segment Reporting, Reconciling Item, Excluding Corporate Nonsegment | Package Business |
Liability for Claims and Claims Adjustment Expense [Line Items] |
Prior Year Claims and Claims Adjustment Expense | 0
Segment Reporting, Reconciling Item, Excluding Corporate Nonsegment | Property Insurance | P&C Commercial Lines |
Liability for Claims and Claims Adjustment Expense [Line Items] |
Prior Year Claims and Claims Adjustment Expense | 0
Segment Reporting, Reconciling Item, Excluding Corporate Nonsegment | Property Insurance | P&C Personal Lines |
Liability for Claims and Claims Adjustment Expense [Line Items] |
Prior Year Claims and Claims Adjustment Expense | (13)
Segment Reporting, Reconciling Item, Excluding Corporate Nonsegment | Professional Liability Insurance |
Liability for Claims and Claims Adjustment Expense [Line Items] |
Prior Year Claims and Claims Adjustment Expense | (20)
Segment Reporting, Reconciling Item, Excluding Corporate Nonsegment | Surety Product Line |
Liability for Claims and Claims Adjustment Expense [Line Items] |
Prior Year Claims and Claims Adjustment Expense | (34)
Segment Reporting, Reconciling Item, Excluding Corporate Nonsegment | Assumed Reinsurance |
Liability for Claims and Claims Adjustment Expense [Line Items] |
Prior Year Claims and Claims Adjustment Expense | 0
Segment Reporting, Reconciling Item, Excluding Corporate Nonsegment | Automobiles | P&C Commercial Lines |
Liability for Claims and Claims Adjustment Expense [Line Items] |
Prior Year Claims and Claims Adjustment Expense | 21
Segment Reporting, Reconciling Item, Excluding Corporate Nonsegment | Automobiles | P&C Personal Lines |
Liability for Claims and Claims Adjustment Expense [Line Items] |
Prior Year Claims and Claims Adjustment Expense | (17)
Segment Reporting, Reconciling Item, Excluding Corporate Nonsegment | Uncollectible Reinsurance |
Liability for Claims and Claims Adjustment Expense [Line Items] |
Prior Year Claims and Claims Adjustment Expense | (19)
Segment Reporting, Reconciling Item, Excluding Corporate Nonsegment | Insurance, Other |
Liability for Claims and Claims Adjustment Expense [Line Items] |
Prior Year Claims and Claims Adjustment Expense | 17
Segment Reporting, Reconciling Item, Excluding Corporate Nonsegment | Workers' Compensation |
Liability for Claims and Claims Adjustment Expense [Line Items] |
Prior Year Claims and Claims Adjustment Expense | $ (70)

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