XML 68 R57.htm IDEA: XBRL DOCUMENT v3.20.2
Unpaid losses and loss expenses Unpaid losses and loss expenses (PPD table) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Liability for Claims and Claims Adjustment Expense [Line Items]        
Net Prior Period Development $ 75 $ (188) $ (43) $ (392)
North America Commercial P&C Insurance [Member]        
Liability for Claims and Claims Adjustment Expense [Line Items]        
Net Prior Period Development (146) (185) (251) (316)
North America Personal P&C Insurance [Member]        
Liability for Claims and Claims Adjustment Expense [Line Items]        
Net Prior Period Development (1) (16) 0 (26)
North American Agriculture Insurance [Member]        
Liability for Claims and Claims Adjustment Expense [Line Items]        
Net Prior Period Development 0 0 (14) (61)
Overseas General Insurance [Member]        
Liability for Claims and Claims Adjustment Expense [Line Items]        
Net Prior Period Development (36) (20) (40) (24)
Global Reinsurance [Member]        
Liability for Claims and Claims Adjustment Expense [Line Items]        
Net Prior Period Development (16) 0 (23) (8)
Corporate Segment [Member]        
Liability for Claims and Claims Adjustment Expense [Line Items]        
Net Prior Period Development 274 33 285 43
Short Tail [Member]        
Liability for Claims and Claims Adjustment Expense [Line Items]        
Net Prior Period Development (38) 18 (124) (130)
Short Tail [Member] | North America Commercial P&C Insurance [Member]        
Liability for Claims and Claims Adjustment Expense [Line Items]        
Net Prior Period Development (5) 21 (67) (45)
Short Tail [Member] | North America Personal P&C Insurance [Member]        
Liability for Claims and Claims Adjustment Expense [Line Items]        
Net Prior Period Development (1) (16) 0 (26)
Short Tail [Member] | North American Agriculture Insurance [Member]        
Liability for Claims and Claims Adjustment Expense [Line Items]        
Net Prior Period Development 0 0 (14) (61)
Short Tail [Member] | Overseas General Insurance [Member]        
Liability for Claims and Claims Adjustment Expense [Line Items]        
Net Prior Period Development (35) (20) (39) (24)
Short Tail [Member] | Global Reinsurance [Member]        
Liability for Claims and Claims Adjustment Expense [Line Items]        
Net Prior Period Development 3 33 (4) 26
Short Tail [Member] | Corporate Segment [Member]        
Liability for Claims and Claims Adjustment Expense [Line Items]        
Net Prior Period Development 0 0 0 0
Long Tail [Member]        
Liability for Claims and Claims Adjustment Expense [Line Items]        
Net Prior Period Development 113 (206) 81 (262)
Long Tail [Member] | North America Commercial P&C Insurance [Member]        
Liability for Claims and Claims Adjustment Expense [Line Items]        
Net Prior Period Development (141) (206) (184) (271)
Long Tail [Member] | North America Personal P&C Insurance [Member]        
Liability for Claims and Claims Adjustment Expense [Line Items]        
Net Prior Period Development 0 0 0 0
Long Tail [Member] | North American Agriculture Insurance [Member]        
Liability for Claims and Claims Adjustment Expense [Line Items]        
Net Prior Period Development 0 0 0 0
Long Tail [Member] | Overseas General Insurance [Member]        
Liability for Claims and Claims Adjustment Expense [Line Items]        
Net Prior Period Development (1) 0 (1) 0
Long Tail [Member] | Global Reinsurance [Member]        
Liability for Claims and Claims Adjustment Expense [Line Items]        
Net Prior Period Development (19) (33) (19) (34)
Long Tail [Member] | Corporate Segment [Member]        
Liability for Claims and Claims Adjustment Expense [Line Items]        
Net Prior Period Development $ 274 $ 33 $ 285 $ 43