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Unpaid losses and loss expenses Unpaid losses and loss expenses (PPD table) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Liability for Claims and Claims Adjustment Expense [Line Items]        
Net Prior Period Development $ (192) $ (200) $ (399) $ (396)
North America Commercial P&C Insurance [Member]        
Liability for Claims and Claims Adjustment Expense [Line Items]        
Net Prior Period Development (144) (146) (192) (218)
North America Personal P&C Insurance [Member]        
Liability for Claims and Claims Adjustment Expense [Line Items]        
Net Prior Period Development (64) (33) (116) (16)
North American Agriculture Insurance [Member]        
Liability for Claims and Claims Adjustment Expense [Line Items]        
Net Prior Period Development 0 (3) (28) (3)
Overseas General Insurance [Member]        
Liability for Claims and Claims Adjustment Expense [Line Items]        
Net Prior Period Development (61) (61) (150) (204)
Global Reinsurance [Member]        
Liability for Claims and Claims Adjustment Expense [Line Items]        
Net Prior Period Development (16) (17) (15) (25)
Corporate Segment [Member]        
Liability for Claims and Claims Adjustment Expense [Line Items]        
Net Prior Period Development 93 60 102 70
Short Tail [Member]        
Liability for Claims and Claims Adjustment Expense [Line Items]        
Net Prior Period Development (184) (128) (495) (343)
Short Tail [Member] | North America Commercial P&C Insurance [Member]        
Liability for Claims and Claims Adjustment Expense [Line Items]        
Net Prior Period Development (2) (7) (146) (88)
Short Tail [Member] | North America Personal P&C Insurance [Member]        
Liability for Claims and Claims Adjustment Expense [Line Items]        
Net Prior Period Development (64) (33) (116) (16)
Short Tail [Member] | North American Agriculture Insurance [Member]        
Liability for Claims and Claims Adjustment Expense [Line Items]        
Net Prior Period Development 0 (3) (28) (3)
Short Tail [Member] | Overseas General Insurance [Member]        
Liability for Claims and Claims Adjustment Expense [Line Items]        
Net Prior Period Development (97) (61) (185) (204)
Short Tail [Member] | Global Reinsurance [Member]        
Liability for Claims and Claims Adjustment Expense [Line Items]        
Net Prior Period Development (21) (24) (20) (32)
Short Tail [Member] | Corporate Segment [Member]        
Liability for Claims and Claims Adjustment Expense [Line Items]        
Net Prior Period Development 0 0 0 0
Long Tail [Member]        
Liability for Claims and Claims Adjustment Expense [Line Items]        
Net Prior Period Development (8) (72) 96 (53)
Long Tail [Member] | North America Commercial P&C Insurance [Member]        
Liability for Claims and Claims Adjustment Expense [Line Items]        
Net Prior Period Development (142) (139) (46) (130)
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 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 0 0
Long Tail [Member] | Overseas General Insurance [Member]        
Liability for Claims and Claims Adjustment Expense [Line Items]        
Net Prior Period Development 36 0 35 0
Long Tail [Member] | Global Reinsurance [Member]        
Liability for Claims and Claims Adjustment Expense [Line Items]        
Net Prior Period Development 5 7 5 7
Long Tail [Member] | Corporate Segment [Member]        
Liability for Claims and Claims Adjustment Expense [Line Items]        
Net Prior Period Development $ 93 $ 60 $ 102 $ 70