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Reserve for Losses and Loss Adjustment Expenses - Prior year development (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]    
Prior year development (favorable) adverse $ (197) $ (124)
Operating segments    
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]    
Prior year development (favorable) adverse (197) (124)
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 (203) (133)
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 6 9
Operating segments | Insurance    
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]    
Prior year development (favorable) adverse (17) (10)
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 (15) (17)
Operating segments | Insurance | Short tailed lines | Property And Marine Product Line    
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]    
Prior year development (favorable) adverse (8)  
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 (8) (9)
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 (2) 7
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   8
Operating segments | Reinsurance    
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]    
Prior year development (favorable) adverse (119) (40)
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 (127) (42)
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 (64)  
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 (35) (33)
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 8 2
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 8  
Operating segments | Mortgage    
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]    
Prior year development (favorable) adverse (61) (74)
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 (61) (74)
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