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Unpaid losses and loss expenses Unpaid losses and loss expenses (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Liability for Claims and Claims Adjustment Expense [Line Items]    
Net Prior Period Development $ (240) $ (192)
Long Tail [Member]    
Liability for Claims and Claims Adjustment Expense [Line Items]    
Net Prior Period Development (12) (37)
Short Tail [Member]    
Liability for Claims and Claims Adjustment Expense [Line Items]    
Net Prior Period Development (228) (155)
North America Commercial P&C Insurance [Member]    
Liability for Claims and Claims Adjustment Expense [Line Items]    
Net Prior Period Development (108) (127)
North America Commercial P&C Insurance [Member] | Long Tail [Member]    
Liability for Claims and Claims Adjustment Expense [Line Items]    
Net Prior Period Development (20) (46)
North America Commercial P&C Insurance [Member] | Short Tail [Member]    
Liability for Claims and Claims Adjustment Expense [Line Items]    
Net Prior Period Development (88) (81)
North America Commercial P&C Insurance [Member] | Accident years 2018 - 2019 [Member] | Surety Product Line [Member] | Short Tail [Member]    
Liability for Claims and Claims Adjustment Expense [Line Items]    
Net Prior Period Development   (49)
North America Commercial P&C Insurance [Member] | Short-Duration Insurance Contract, Accident Year 2020 | Surety Product Line [Member] | Short Tail [Member]    
Liability for Claims and Claims Adjustment Expense [Line Items]    
Net Prior Period Development (38)  
North America Commercial P&C Insurance [Member] | Short-Duration Insurance Contract, Accident Year 2020 | Property and Inland Marine [Member] | Short Tail [Member]    
Liability for Claims and Claims Adjustment Expense [Line Items]    
Net Prior Period Development   (25)
North America Commercial P&C Insurance [Member] | Accident Years 2019 - 2020 | First Party Cyber risk [Member] | Short Tail [Member]    
Liability for Claims and Claims Adjustment Expense [Line Items]    
Net Prior Period Development   41
North America Commercial P&C Insurance [Member] | Accident Years 2019 - 2020 | Accident and Health Insurance Product Line [Member] | Short Tail [Member]    
Liability for Claims and Claims Adjustment Expense [Line Items]    
Net Prior Period Development   (48)
North America Commercial P&C Insurance [Member] | Accident years 2017 and prior | Environmental lines [Member] | Long Tail [Member]    
Liability for Claims and Claims Adjustment Expense [Line Items]    
Net Prior Period Development   (35)
North America Commercial P&C Insurance [Member] | Accident years 2017 and prior | Workers' Compensation Insurance [Member] | Long Tail [Member]    
Liability for Claims and Claims Adjustment Expense [Line Items]    
Net Prior Period Development (38)  
North America Commercial P&C Insurance [Member] | Accident years 2019 and prior [Member] | Commercial Excess and Umbrella [Member] | Long Tail [Member]    
Liability for Claims and Claims Adjustment Expense [Line Items]    
Net Prior Period Development 60  
North America Commercial P&C Insurance [Member] | Accident years 2020 and 2021 [Member] | Accident and Health Insurance Product Line [Member] | Short Tail [Member]    
Liability for Claims and Claims Adjustment Expense [Line Items]    
Net Prior Period Development (76)  
North America Commercial P&C Insurance [Member] | Accident years 2020 and 2021 [Member] | Property and Casualty, Personal Insurance [Member] | Long Tail [Member]    
Liability for Claims and Claims Adjustment Expense [Line Items]    
Net Prior Period Development (38)  
North America Commercial P&C Insurance [Member] | Short-Duration Insurance Contract, Accident Year 2021 [Member] | Property, Liability and Casualty Insurance Product Line | Short Tail [Member]    
Liability for Claims and Claims Adjustment Expense [Line Items]    
Net Prior Period Development 21  
North America Commercial P&C Insurance [Member] | Accident years 2016 and 2017 | Professional Malpractice Liability Insurance [Member] | Long Tail [Member]    
Liability for Claims and Claims Adjustment Expense [Line Items]    
Net Prior Period Development   (51)
North America Commercial P&C Insurance [Member] | Accident years 2015 to 2019 [Member] | Commercial Excess and Umbrella [Member] | Long Tail [Member]    
Liability for Claims and Claims Adjustment Expense [Line Items]    
Net Prior Period Development   57
North America Agricultural Insurance [Member]    
Liability for Claims and Claims Adjustment Expense [Line Items]    
Net Prior Period Development (26) (2)
North America Agricultural Insurance [Member] | Long Tail [Member]    
Liability for Claims and Claims Adjustment Expense [Line Items]    
Net Prior Period Development 0 0
North America Agricultural Insurance [Member] | Short Tail [Member]    
Liability for Claims and Claims Adjustment Expense [Line Items]    
Net Prior Period Development (26) (2)
North America Agricultural Insurance [Member] | Short-Duration Insurance Contract, Accident Year 2021 [Member]    
Liability for Claims and Claims Adjustment Expense [Line Items]    
Net Prior Period Development (26)  
Corporate Segment [Member]    
Liability for Claims and Claims Adjustment Expense [Line Items]    
Net Prior Period Development 8 9
Corporate Segment [Member] | Long Tail [Member]    
Liability for Claims and Claims Adjustment Expense [Line Items]    
Net Prior Period Development 8 9
Corporate Segment [Member] | Short Tail [Member]    
Liability for Claims and Claims Adjustment Expense [Line Items]    
Net Prior Period Development 0 0
Overseas General Insurance [Member]    
Liability for Claims and Claims Adjustment Expense [Line Items]    
Net Prior Period Development (60) (25)
Overseas General Insurance [Member] | Long Tail [Member]    
Liability for Claims and Claims Adjustment Expense [Line Items]    
Net Prior Period Development 0 0
Overseas General Insurance [Member] | Short Tail [Member]    
Liability for Claims and Claims Adjustment Expense [Line Items]    
Net Prior Period Development (60) (25)
Overseas General Insurance [Member] | Short-Duration Insurance Contract, Accident Year 2020    
Liability for Claims and Claims Adjustment Expense [Line Items]    
Net Prior Period Development   (25)
Overseas General Insurance [Member] | Accident years 2020 and 2021 [Member] | Accident and Health Insurance Product Line [Member] | Short Tail [Member]    
Liability for Claims and Claims Adjustment Expense [Line Items]    
Net Prior Period Development (22)  
Overseas General Insurance [Member] | Accident years 2020 and 2021 [Member] | Property, Liability and Casualty Insurance Product Line | Short Tail [Member]    
Liability for Claims and Claims Adjustment Expense [Line Items]    
Net Prior Period Development (24)  
North America Personal P&C Insurance [Member]    
Liability for Claims and Claims Adjustment Expense [Line Items]    
Net Prior Period Development (51) (40)
North America Personal P&C Insurance [Member] | Long Tail [Member]    
Liability for Claims and Claims Adjustment Expense [Line Items]    
Net Prior Period Development 0 0
North America Personal P&C Insurance [Member] | Short Tail [Member]    
Liability for Claims and Claims Adjustment Expense [Line Items]    
Net Prior Period Development (51) (40)
North America Personal P&C Insurance [Member] | Short-Duration Insurance Contract, Accident Year 2020    
Liability for Claims and Claims Adjustment Expense [Line Items]    
Net Prior Period Development   (40)
North America Personal P&C Insurance [Member] | Short-Duration Insurance Contract, Accident Year 2021 [Member]    
Liability for Claims and Claims Adjustment Expense [Line Items]    
Net Prior Period Development (51)  
Global Reinsurance [Member]    
Liability for Claims and Claims Adjustment Expense [Line Items]    
Net Prior Period Development (3) (7)
Global Reinsurance [Member] | Long Tail [Member]    
Liability for Claims and Claims Adjustment Expense [Line Items]    
Net Prior Period Development 0 0
Global Reinsurance [Member] | Short Tail [Member]    
Liability for Claims and Claims Adjustment Expense [Line Items]    
Net Prior Period Development $ (3) $ (7)