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Unpaid losses and loss expenses Unpaid losses and loss expenses (PPD table) (Detail) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]        
Prior Year Claims and Claims Adjustment Expense $ (243) $ (270) $ (643) $ (671)
North America Commercial P&C Insurance [Member]        
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]        
Prior Year Claims and Claims Adjustment Expense (216) (236) (472) (546)
North America Personal P&C Insurance [Member]        
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]        
Prior Year Claims and Claims Adjustment Expense 58 32 59 66
North American Agriculture Insurance [Member]        
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]        
Prior Year Claims and Claims Adjustment Expense (1) (4) (77) (83)
Overseas General Insurance [Member]        
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]        
Prior Year Claims and Claims Adjustment Expense (72) (108) (166) (184)
Global Reinsurance [Member]        
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]        
Prior Year Claims and Claims Adjustment Expense (24) (41) (54) (64)
Corporate Segment [Member]        
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]        
Prior Year Claims and Claims Adjustment Expense 12 87 67 140
Short Tail [Member]        
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]        
Prior Year Claims and Claims Adjustment Expense 3 20 (324) (261)
Short Tail [Member] | North America Commercial P&C Insurance [Member]        
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]        
Prior Year Claims and Claims Adjustment Expense (46) (6) (206) (139)
Short Tail [Member] | North America Personal P&C Insurance [Member]        
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]        
Prior Year Claims and Claims Adjustment Expense 58 32 59 66
Short Tail [Member] | North American Agriculture Insurance [Member]        
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]        
Prior Year Claims and Claims Adjustment Expense (1) (4) (77) (83)
Short Tail [Member] | Overseas General Insurance [Member]        
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]        
Prior Year Claims and Claims Adjustment Expense (23) (2) (115) (110)
Short Tail [Member] | Global Reinsurance [Member]        
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]        
Prior Year Claims and Claims Adjustment Expense 15 0 15 5
Short Tail [Member] | Corporate Segment [Member]        
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]        
Prior Year Claims and Claims Adjustment Expense 0 0 0 0
Long Tail [Member]        
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]        
Prior Year Claims and Claims Adjustment Expense (246) (290) (319) (410)
Long Tail [Member] | North America Commercial P&C Insurance [Member]        
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]        
Prior Year Claims and Claims Adjustment Expense (170) (230) (266) (407)
Long Tail [Member] | North America Personal P&C Insurance [Member]        
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]        
Prior Year Claims and Claims Adjustment Expense 0 0 0 0
Long Tail [Member] | North American Agriculture Insurance [Member]        
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]        
Prior Year Claims and Claims Adjustment Expense 0 0 0 0
Long Tail [Member] | Overseas General Insurance [Member]        
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]        
Prior Year Claims and Claims Adjustment Expense (49) (106) (51) (74)
Long Tail [Member] | Global Reinsurance [Member]        
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]        
Prior Year Claims and Claims Adjustment Expense (39) (41) (69) (69)
Long Tail [Member] | Corporate Segment [Member]        
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]        
Prior Year Claims and Claims Adjustment Expense $ 12 $ 87 $ 67 $ 140