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Reserve for Losses and Loss Adjustment Expenses - Prior years reserve development (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]      
Prior year reserve development (favorable) adverse $ (507) $ (538) $ (769)
Operating segments      
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]      
Prior year reserve development (favorable) adverse (507) (538) (769)
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 (567) (631) (814)
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 60 93 45
Operating segments | Insurance      
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]      
Prior year reserve development (favorable) adverse (37) (42) (25)
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 (53) (85) (65)
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 (32) (15) (15)
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 | Property and marine      
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]      
Prior year reserve development (favorable) adverse   (43)  
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) (37)
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 16 43 40
Operating segments | Insurance | 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     18
Operating segments | Insurance | Long-tailed lines | Professional Liability Insurance      
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]      
Prior year reserve development (favorable) adverse   50 25
Operating segments | Reinsurance      
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]      
Prior year reserve development (favorable) adverse (188) (152) (190)
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 (232) (202) (195)
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 (99) (93) (109)
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) (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 (64) (51) (24)
Operating segments | Reinsurance | Short-tailed lines | Marine and aviation      
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]      
Prior year reserve development (favorable) adverse     (28)
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 44 50 5
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 44 45 5
Operating segments | Mortgage      
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]      
Prior year reserve development (favorable) adverse (282) (344) (554)
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 (282) (344) (554)
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