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Reserve for Unpaid Losses and Loss Adjustment Expenses (Tables)
3 Months Ended
Dec. 31, 2024
Liability for Unpaid Claims and Claims Adjustment Expense, Activity in Liability [Abstract]  
Schedule of Liability for Unpaid Claims and Claims Adjustment Expense [Table Text Block]
Unfavorable (Favorable) Prior Accident Year DevelopmentFor the three months ended December 31, 2024
Workers’ compensation$(70)
Workers’ compensation discount accretion10 
General liability130 
Marine— 
Package business— 
Commercial property— 
Professional liability(20)
Bond(34)
Assumed reinsurance— 
Automobile liability - Commercial Lines21 
Automobile liability - Personal Lines(17)
Homeowners(13)
Net asbestos and environmental ("A&E") reserves141 
Catastrophes(49)
Uncollectible reinsurance(19)
Other reserve re-estimates, net 17 
Prior accident year development, including full benefit for the adverse development cover ("ADC") cession
97 
Change in deferred gain on retroactive reinsurance included in other liabilities [1]
Total prior accident year development$101 
[1] Change in deferred gain on retroactive reinsurance for the three months ended December 31, 2024, included a benefit for amortization of the Navigators ADC deferred gain of $58. The change in deferred gain for the three months ended December 31, 2024, also included $62 of adverse development on A&E reserves in excess of ceded premium paid.