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Reserve for Losses and Loss Adjustment Expenses - Prior year development (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]        
Prior year development favorable (unfavorable) $ 146 $ 180 $ 403 $ 492
Operating segments | Insurance        
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]        
Prior year development favorable (unfavorable) $ 10 $ 5 $ 34 $ 19
Percentage of prior year development 0.70% 0.50% 0.80% 0.60%
Operating segments | Insurance | Medium tailed lines        
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]        
Prior year development favorable (unfavorable) $ (20)   $ (52)  
Operating segments | Insurance | Medium tailed lines | Professional liability        
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]        
Prior year development favorable (unfavorable) (25) $ (11) (48) $ (25)
Operating segments | Insurance | Medium tailed lines | Contract binding        
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]        
Prior year development favorable (unfavorable)     (11) (6)
Operating segments | Insurance | Medium tailed lines | Marine        
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]        
Prior year development favorable (unfavorable)   6 11 11
Operating segments | Insurance | Long tailed lines | Casualty        
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]        
Prior year development favorable (unfavorable)   (12)   (18)
Operating segments | Insurance | Long tailed lines | Executive assurance        
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]        
Prior year development favorable (unfavorable) 7   24  
Operating segments | Insurance | Long tailed lines | Other lines        
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]        
Prior year development favorable (unfavorable)       17
Operating segments | Insurance | Long tailed lines | Alternative markets        
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]        
Prior year development favorable (unfavorable) 7   13  
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 (unfavorable)   16   49
Operating segments | Insurance | Short tailed lines | Property excluding marine        
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]        
Prior year development favorable (unfavorable) 8 9 33  
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 development favorable (unfavorable) 6 6 20 37
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 (unfavorable) 6   11 14
Operating segments | Insurance | Medium tailed and long tailed lines        
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]        
Prior year development favorable (unfavorable)   (11)   (30)
Operating segments | Insurance | Short tailed and long tailed lines        
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]        
Prior year development favorable (unfavorable) 30   86  
Operating segments | Reinsurance        
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]        
Prior year development favorable (unfavorable) $ 44 $ 49 $ 126 $ 127
Percentage of prior year development 2.80% 4.90% 3.00% 4.70%
Operating segments | Reinsurance | Medium tailed lines | Marine and aviation        
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]        
Prior year development favorable (unfavorable) $ (4) $ 8 $ 5 $ 23
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 (unfavorable)   (9) (42) (20)
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 (unfavorable) (21) (10) (39) (19)
Operating segments | Reinsurance | Short tailed and medium tailed lines        
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]        
Prior year development favorable (unfavorable)   58 168 148
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 (unfavorable) 69      
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 (unfavorable) 22 13 29 22
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 (unfavorable) 29 36 75 83
Operating segments | Reinsurance | Short tailed lines | Other specialty lines and other lines        
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]        
Prior year development favorable (unfavorable) 19      
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 (unfavorable)     46 20
Operating segments | Reinsurance | Short tailed lines | Other lines        
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]        
Prior year development favorable (unfavorable)     12  
Operating segments | Reinsurance | Medium tailed and long tailed lines        
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]        
Prior year development favorable (unfavorable) (25)      
Operating segments | Mortgage        
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]        
Prior year development favorable (unfavorable) $ 92 $ 126 $ 243 $ 346
Percentage of prior year development 31.40% 44.70% 27.50% 39.90%