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Reserve for Losses and Loss Adjustment Expenses - Prior years reserve development (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]      
Prior year reserve development (favorable) adverse $ (600) $ (507) $ (538)
Operating segments      
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]      
Prior year reserve development (favorable) adverse (600) (507) (538)
Operating segments | Short-tailed lines      
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]      
Prior year reserve development (favorable) adverse (682) (567) (631)
Operating segments | Long-tailed lines      
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]      
Prior year reserve development (favorable) adverse 82 60 93
Operating segments | Insurance      
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]      
Prior year reserve development (favorable) adverse (43) (37) (42)
Operating segments | Insurance | Short-tailed lines      
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]      
Prior year reserve development (favorable) adverse (61) (53) (85)
Operating segments | Insurance | Short-tailed lines | Travel and accident      
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]      
Prior year reserve development (favorable) adverse (26) (32) (15)
Operating segments | Insurance | Short-tailed lines | Property, energy, marine and aviation      
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]      
Prior year reserve development (favorable) adverse (21)   (43)
Operating segments | Insurance | Short-tailed lines | Surety      
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]      
Prior year reserve development (favorable) adverse   (31)  
Operating segments | Insurance | Short-tailed lines | Warranty and lenders solutions      
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]      
Prior year reserve development (favorable) adverse     (22)
Operating segments | Insurance | Long-tailed lines      
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]      
Prior year reserve development (favorable) adverse 18 16 43
Operating segments | Insurance | Long-tailed lines | Professional liability      
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]      
Prior year reserve development (favorable) adverse     50
Operating segments | Reinsurance      
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]      
Prior year reserve development (favorable) adverse (322) (188) (152)
Operating segments | Reinsurance | Short-tailed lines      
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]      
Prior year reserve development (favorable) adverse (386) (232) (202)
Operating segments | Reinsurance | Short-tailed lines | Property excluding property catastrophe      
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]      
Prior year reserve development (favorable) adverse (178) (99) (93)
Operating segments | Reinsurance | Short-tailed lines | Other specialty lines      
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]      
Prior year reserve development (favorable) adverse   (74) (35)
Operating segments | Reinsurance | Short-tailed lines | Property catastrophe      
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]      
Prior year reserve development (favorable) adverse (141) (64) (51)
Operating segments | Reinsurance | Long-tailed lines      
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]      
Prior year reserve development (favorable) adverse 64 44 50
Operating segments | Reinsurance | Long-tailed lines | Casualty      
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]      
Prior year reserve development (favorable) adverse 64 44 45
Operating segments | Mortgage      
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]      
Prior year reserve development (favorable) adverse (235) (282) (344)
Operating segments | Mortgage | Short-tailed lines      
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]      
Prior year reserve development (favorable) adverse (235) (282) (344)
Operating segments | Mortgage | Long-tailed lines      
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]      
Prior year reserve development (favorable) adverse $ 0 $ 0 $ 0