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Reserve for Losses and Loss Adjustment Expenses - Prior year development (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]        
Prior year development (favorable) adverse $ (153) $ (121) $ (350) $ (245)
Operating segments        
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]        
Prior year development (favorable) adverse (153) (121) (350) (245)
Operating segments | Short tailed lines        
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]        
Prior year development (favorable) adverse (152) (143) (355) (277)
Operating segments | Long tailed lines        
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]        
Prior year development (favorable) adverse (1) 22 5 32
Operating segments | Insurance        
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]        
Prior year development (favorable) adverse (8) (5) (25) (15)
Operating segments | Insurance | Short tailed lines        
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]        
Prior year development (favorable) adverse (13) (13) (28) (30)
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 development (favorable) adverse (7)   (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 development (favorable) adverse   15 (11)  
Operating segments | Insurance | Short tailed lines | Surety Product Line        
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]        
Prior year development (favorable) adverse   (20)   (25)
Operating segments | Insurance | Long tailed lines        
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]        
Prior year development (favorable) adverse 5 8 3 15
Operating segments | Insurance | Long tailed lines | Programs business        
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]        
Prior year development (favorable) adverse 14 9   17
Operating segments | Reinsurance        
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]        
Prior year development (favorable) adverse (81) (34) (200) (74)
Operating segments | Reinsurance | Short tailed lines        
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]        
Prior year development (favorable) adverse (75) (48) (202) (91)
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 development (favorable) adverse     (86)  
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 development (favorable) adverse       (37)
Operating segments | Reinsurance | Short tailed lines | Property other than property catastrophe        
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]        
Prior year development (favorable) adverse (60) (30) (89) (51)
Operating segments | Reinsurance | Long tailed lines        
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]        
Prior year development (favorable) adverse (6) 14 2 17
Operating segments | Reinsurance | Long tailed lines | Casualty        
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]        
Prior year development (favorable) adverse   14   17
Operating segments | Mortgage        
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]        
Prior year development (favorable) adverse (64) (82) (125) (156)
Operating segments | Mortgage | Short tailed lines        
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]        
Prior year development (favorable) adverse (64) (82) (125) (156)
Operating segments | Mortgage | Long tailed lines        
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]        
Prior year development (favorable) adverse $ 0 $ 0 $ 0 $ 0