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Unpaid losses and loss expenses (RF) (Details) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Unpaid Losses and Loss Expenses [Roll Forward]    
Gross unpaid losses and loss expenses – beginning of period $ 67,811 $ 62,690
Reinsurance recoverable on unpaid losses – beginning of period (1) (14,647) (14,181)
Net unpaid losses and loss expenses – beginning of period 53,164 48,509
Current Year Claims and Claims Adjustment Expense 10,546 11,111
Prior Year Claims and Claims Adjustment Expense [1] (487) (49)
Total, Incurred 10,059 11,062
Net loss and loss expenses paid, Current Year 2,355 2,263
Net loss and loss expenses paid, Prior Years 5,531 5,842
Total, Paid 7,886 8,105
Liability For Unpaid Claims And Claims Adjustment Expense Foreign Currency Revaluation And Other 231 (128)
Net unpaid losses and loss expenses – end of period 55,568 51,338
Reinsurance recoverable on unpaid losses (1) [2] 14,721 14,361
Gross unpaid losses and loss expenses – end of period 70,289 65,699
prior period development, net adjustments 27 $ 6
Liability for Unpaid Claims and Claims Adjustment Expense, Period Increase (Decrease), Gross 2,478  
Liability for Unpaid Claims and Claims Adjustment Expense, Period Increase (Decrease) $ 2,404  
[1] Relates to prior period loss reserve development only and excludes prior period development related to reinstatement premiums, expense adjustments and earned premiums totaling $27 million and $6 million for the six months ended June 30, 2021 and 2020, respectively.
[2] Net of valuation allowance for uncollectible reinsurance.