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Reserve for Unpaid Losses and Loss Adjustment Expenses - Discounted Reserves, P&C (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Weighted Average Discount Rate [Line Items]      
Short-Duration Insurance Contract, Discounted Liability, Interest Accretion, Statement of Financial Position [Extensible Enumeration] Benefits, losses and loss adjustment expenses Benefits, losses and loss adjustment expenses Benefits, losses and loss adjustment expenses
Property and Casualty Insurance Products      
Weighted Average Discount Rate [Line Items]      
Liability for unpaid losses and loss adjustment expenses, at undiscounted amounts $ 1,184 $ 1,255 $ 1,343
Amount of discount 333 339 347
Carrying value of liability for unpaid losses and loss adjustment expenses 851 916 996
Discount accretion included in losses and loss adjustment expenses $ 44 $ 42 $ 36
Property and Casualty Insurance Products | Minimum      
Weighted Average Discount Rate [Line Items]      
Discount Rate 0.83% 0.83% 0.83%
Property and Casualty Insurance Products | Maximum      
Weighted Average Discount Rate [Line Items]      
Discount Rate 14.03% 14.03% 14.03%
Property and Casualty Insurance Products | Weighted Average Expected Life      
Weighted Average Discount Rate [Line Items]      
Discount Rate 2.80% 2.74% 2.71%