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Unpaid losses and loss expenses (RF) (Detail) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Unpaid Losses and Loss Expenses [Roll Forward]    
Gross unpaid losses and loss expenses – beginning of period $ 62,960 $ 63,179
Reinsurance recoverable on unpaid losses - beginning of period (1) [1] (14,689) (14,014)
Net unpaid losses and loss expenses – beginning of period 48,271 49,165
Current Year Claims and Claims Adjustment Expense 4,326 4,358
Prior Year Claims and Claims Adjustment Expense [2] (228) (256)
Total, Incurred 4,098 4,102
Net loss and loss expenses paid, Current Year 785 809
Net loss and loss expenses paid, Prior Years 3,234 3,433
Total, Paid 4,019 4,242
Liability For Unpaid Claims And Claims Adjustment Expense Foreign Currency Revaluation And Other 86 292
Net unpaid losses and loss expenses – end of period 48,436 49,317
Reinsurance recoverable on unpaid losses (1) [1] 14,707 13,822
Gross unpaid losses and loss expenses – end of period 63,143 63,139
prior period development, net adjustments $ 24 $ 47
[1] Net of provision for uncollectible reinsurance.
[2] Relates to prior period loss reserve development only and excludes prior period development related to reinstatement premiums, expense adjustments and earned premiums totaling $24 million and $47 million for the three months ended March 31, 2019 and 2018, respectively.