Liability for Unpaid Losses and Loss Adjustment Expense - Short-duration Insurance Contracts, Schedule of Historical Claims Duration (Details) - Property and Casualty, Personal Insurance Product Line	Dec. 31, 2025
Short-Duration Insurance Contracts, Historical Claims Duration [Line Items]
Short-duration Insurance Contracts, Historical Claims Duration, Year One	50.70%
Short-duration Insurance Contracts, Historical Claims Duration, Year Two	23.30%
Short-duration Insurance Contracts, Historical Claims Duration, Year Three	11.70%
Short-duration Insurance Contracts, Historical Claims Duration, Year Four	7.50%
Short-duration Insurance Contracts, Historical Claims Duration, Year Five	3.80%
Short-duration Insurance Contracts, Historical Claims Duration, Year Six	1.50%
Short-duration Insurance Contracts, Historical Claims Duration, Year Seven	1.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Eight	0.30%
Short-duration Insurance Contracts, Historical Claims Duration, Year Nine	0.20%
Short-duration Insurance Contracts, Historical Claims Duration, Year Ten	0.00%