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Unpaid losses and loss expenses Unpaid losses and loss expenses (PPD table) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]      
Net Prior Period Development $ (856) $ (773) $ (876)
Prior Period Development Percentage Opening Net Unpaid Reserves [1] 1.40% 1.30% 1.60%
Long Tail [Member]      
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]      
Net Prior Period Development $ 288 $ 148 $ 58
Short Tail [Member]      
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]      
Net Prior Period Development (1,144) (921) (934)
North America Commercial P&C Insurance [Member]      
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]      
Net Prior Period Development $ (428) $ (494) $ (562)
Prior Period Development Percentage Opening Net Unpaid Reserves [1] 0.70% 0.80% 1.00%
North America Commercial P&C Insurance [Member] | Long Tail [Member]      
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]      
Net Prior Period Development $ 18 $ (86) $ (229)
North America Commercial P&C Insurance [Member] | Short Tail [Member]      
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]      
Net Prior Period Development (446) (408) (333)
North America Personal P&C Insurance [Member]      
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]      
Net Prior Period Development $ (305) $ (134) $ (186)
Prior Period Development Percentage Opening Net Unpaid Reserves [1] 0.50% 0.20% 0.30%
North America Personal P&C Insurance [Member] | Long Tail [Member]      
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]      
Net Prior Period Development $ 0 $ 0 $ 0
North America Personal P&C Insurance [Member] | Short Tail [Member]      
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]      
Net Prior Period Development (305) (134) (186)
North America Agricultural Insurance [Member]      
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]      
Net Prior Period Development $ (104) $ (18) $ (61)
Prior Period Development Percentage Opening Net Unpaid Reserves [1] 0.20% 0.00% 0.10%
North America Agricultural Insurance [Member] | Long Tail [Member]      
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]      
Net Prior Period Development $ 0 $ 0 $ 0
North America Agricultural Insurance [Member] | Short Tail [Member]      
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]      
Net Prior Period Development (104) (18) (61)
Overseas General Insurance [Member]      
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]      
Net Prior Period Development $ (290) $ (376) $ (448)
Prior Period Development Percentage Opening Net Unpaid Reserves [1] 0.50% 0.60% 0.80%
Overseas General Insurance [Member] | Long Tail [Member]      
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]      
Net Prior Period Development $ (26) $ (50) $ (65)
Overseas General Insurance [Member] | Short Tail [Member]      
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]      
Net Prior Period Development (264) (326) (383)
Global Reinsurance [Member]      
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]      
Net Prior Period Development $ (25) $ (28) $ 22
Prior Period Development Percentage Opening Net Unpaid Reserves [1] 0.00% 0.00% 0.00%
Global Reinsurance [Member] | Long Tail [Member]      
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]      
Net Prior Period Development $ 0 $ 7 $ (7)
Global Reinsurance [Member] | Short Tail [Member]      
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]      
Net Prior Period Development (25) (35) 29
Corporate Segment [Member]      
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]      
Net Prior Period Development $ 296 $ 277 $ 359
Prior Period Development Percentage Opening Net Unpaid Reserves [1] 0.50% 0.50% 0.60%
Corporate Segment [Member] | Long Tail [Member]      
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]      
Net Prior Period Development $ 296 $ 277 $ 359
Corporate Segment [Member] | Short Tail [Member]      
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]      
Net Prior Period Development $ 0 $ 0 $ 0
[1] Calculated based on the beginning of period consolidated net unpaid losses and loss expenses.