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Related party transaction Related Party Transactions (Tables)
 12 Months Ended
Dec. 31, 2017
Related Party Transactions [Abstract]  
Schedule of Related Party Transactions [Table Text Block]
Transactions generated under these agreements were as follows:
 
Year Ended December 31
 
(in millions of U.S. dollars)
2017

 
2016

 
2015

Gross premiums written
$
464

 
$
658

 
$
305

Ceded premiums written
$
175

 
$
208

 
$
78

Commissions paid
$
101

 
$
145

 
$
60

Commissions received
$
37

 
$
56

 
$
19

Losses and loss expenses incurred
$
438

 
$
313

 
$
137