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Unpaid losses and loss expenses Unpaid losses and loss expenses (Tables)
 9 Months Ended
Sep. 30, 2019
Liability for Claims and Claims Adjustment Expense [Abstract]  
Schedule of Liability for Unpaid Claims and Claims Adjustment Expense [Table Text Block]

The following table presents a reconciliation of beginning and ending Unpaid losses and loss expenses:
 
Nine Months Ended September 30
 
(in millions of U.S. dollars)
2019

 
2018

Gross unpaid losses and loss expenses – beginning of period
$
62,960

 
$
63,179

Reinsurance recoverable on unpaid losses - beginning of period (1)
(14,689
)
 
(14,014
)
Net unpaid losses and loss expenses – beginning of period
48,271

 
49,165

Net losses and loss expenses incurred in respect of losses occurring in:
 
 
 
Current year
14,484

 
14,186

Prior years (2)
(619
)
 
(729
)
Total
13,865

 
13,457

Net losses and loss expenses paid in respect of losses occurring in:
 
 
 
Current year
4,920

 
4,522

Prior years
8,374

 
8,596

Total
13,294

 
13,118

Foreign currency revaluation and other
(162
)
 
(440
)
Net unpaid losses and loss expenses – end of period
48,680

 
49,064

Reinsurance recoverable on unpaid losses (1)
14,332

 
13,965

Gross unpaid losses and loss expenses – end of period
$
63,012

 
$
63,029

(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 $60 million and $86 million for the nine months ended September 30, 2019 and 2018, respectively.
Prior Period Development, by Segment [Table Text Block]
The following table summarizes (favorable) and adverse PPD by segment.
 
Three Months Ended September 30
 
 
Nine Months Ended September 30
 
(in millions of U.S. dollars)
Long-tail    

 
Short-tail

 
Total

 
Long-tail    

 
Short-tail

 
Total

2019
 
 
 
 
 
 
 
 
 
 
 
North America Commercial P&C Insurance
$
(197
)
 
$
88

 
$
(109
)
 
$
(468
)
 
$
43

 
$
(425
)
North America Personal P&C Insurance
—

 
(62
)
 
(62
)
 
—

 
(88
)
 
(88
)
North America Agricultural Insurance
—

 
18

 
18

 
—

 
(43
)
 
(43
)
Overseas General Insurance
(66
)
 
41

 
(25
)
 
(66
)
 
17

 
(49
)
Global Reinsurance
(25
)
 
—

 
(25
)
 
(59
)
 
26

 
(33
)
Corporate
36

 
—

 
36

 
79

 
—

 
79

Total
$
(252
)
 
$
85

 
$
(167
)
 
$
(514
)
 
$
(45
)
 
$
(559
)
2018
 
 
 
 
 
 
 
 
 
 
 
North America Commercial P&C Insurance
$
(170
)
 
$
(46
)
 
$
(216
)
 
$
(266
)
 
$
(206
)
 
$
(472
)
North America Personal P&C Insurance
—

 
58

 
58

 
—

 
59

 
59

North America Agricultural Insurance
—

 
(1
)
 
(1
)
 
—

 
(77
)
 
(77
)
Overseas General Insurance
(49
)
 
(23
)
 
(72
)
 
(51
)
 
(115
)
 
(166
)
Global Reinsurance
(39
)
 
15

 
(24
)
 
(69
)
 
15

 
(54
)
Corporate
12

 
—

 
12

 
67

 
—

 
67

Total
$
(246
)
 
$
3

 
$
(243
)
 
$
(319
)
 
$
(324
)
 
$
(643
)