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Unpaid losses and loss expenses Unpaid losses and loss expenses (PPD table) (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Liability for Claims and Claims Adjustment Expense [Line Items]    
Net Prior Period Development $ (255) $ (207)
North America Commercial P&C Insurance [Member]    
Liability for Claims and Claims Adjustment Expense [Line Items]    
Net Prior Period Development (114) (48)
North America Personal P&C Insurance [Member]    
Liability for Claims and Claims Adjustment Expense [Line Items]    
Net Prior Period Development 0 (52)
North American Agriculture Insurance [Member]    
Liability for Claims and Claims Adjustment Expense [Line Items]    
Net Prior Period Development (33) (28)
Overseas General Insurance [Member]    
Liability for Claims and Claims Adjustment Expense [Line Items]    
Net Prior Period Development (121) (89)
Global Reinsurance [Member]    
Liability for Claims and Claims Adjustment Expense [Line Items]    
Net Prior Period Development 0 1
Corporate Segment [Member]    
Liability for Claims and Claims Adjustment Expense [Line Items]    
Net Prior Period Development 13 9
Short Tail [Member]    
Liability for Claims and Claims Adjustment Expense [Line Items]    
Net Prior Period Development (313) (311)
Short Tail [Member] | North America Commercial P&C Insurance [Member]    
Liability for Claims and Claims Adjustment Expense [Line Items]    
Net Prior Period Development (163) (144)
Short Tail [Member] | North America Personal P&C Insurance [Member]    
Liability for Claims and Claims Adjustment Expense [Line Items]    
Net Prior Period Development 0 (52)
Short Tail [Member] | North American Agriculture Insurance [Member]    
Liability for Claims and Claims Adjustment Expense [Line Items]    
Net Prior Period Development (33) (28)
Short Tail [Member] | Overseas General Insurance [Member]    
Liability for Claims and Claims Adjustment Expense [Line Items]    
Net Prior Period Development (122) (88)
Short Tail [Member] | Global Reinsurance [Member]    
Liability for Claims and Claims Adjustment Expense [Line Items]    
Net Prior Period Development 5 1
Short Tail [Member] | Corporate Segment [Member]    
Liability for Claims and Claims Adjustment Expense [Line Items]    
Net Prior Period Development 0 0
Long Tail [Member]    
Liability for Claims and Claims Adjustment Expense [Line Items]    
Net Prior Period Development 58 104
Long Tail [Member] | North America Commercial P&C Insurance [Member]    
Liability for Claims and Claims Adjustment Expense [Line Items]    
Net Prior Period Development 49 96
Long Tail [Member] | North America Personal P&C Insurance [Member]    
Liability for Claims and Claims Adjustment Expense [Line Items]    
Net Prior Period Development 0 0
Long Tail [Member] | North American Agriculture Insurance [Member]    
Liability for Claims and Claims Adjustment Expense [Line Items]    
Net Prior Period Development 0 0
Long Tail [Member] | Overseas General Insurance [Member]    
Liability for Claims and Claims Adjustment Expense [Line Items]    
Net Prior Period Development 1 (1)
Long Tail [Member] | Global Reinsurance [Member]    
Liability for Claims and Claims Adjustment Expense [Line Items]    
Net Prior Period Development (5) 0
Long Tail [Member] | Corporate Segment [Member]    
Liability for Claims and Claims Adjustment Expense [Line Items]    
Net Prior Period Development $ 13 $ 9