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Financial instruments and risk concentration (Tables)
 12 Months Ended
Dec. 31, 2014
Risks and Uncertainties [Abstract]  
Details on accounts receivable allowances
Details of these accounts receivable allowances are as follows:
 
 
2014
 
2013
 
2012
Balance, January 1
 
$
22

 
$
31

 
$
19

Additions charged (credited) to operating results
 
(9
)
 
(9
)
 
12

Recoveries and write-offs, net
 
(1
)
 
—

 
—

Balance, December 31
 
$
12

 
$
22

 
$
31