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Allowance for Doubtful Accounts
 12 Months Ended
Dec. 31, 2014
Allowance for Doubtful Accounts [Abstract]  
ALLOWANCE FOR DOUBTFUL ACCOUNTS
16.
ALLOWANCE FOR DOUBTFUL ACCOUNTS
Accounts receivable are stated at estimated net realizable values. The allowances shown below as at the end of each period, are recorded as the amounts considered by management to be sufficient to meet probable future losses related to uncollectible accounts.
 
Balance at
beginning of year
 
Additions/
(releases)
charged to
costs and expenses
 
Deductions
/ Other movements
 
Foreign
exchange differences
 
Balance at
end of year
Description
 
 
 
 
 
 
 
 
 
 
(millions)
Year Ended December 31, 2014
 

 
 

 
 

 
 

 
 

Allowance for doubtful accounts
$
13

 
$
4

 
$
(6
)
 
$
1

 
$
12

Year Ended December 31, 2013
 

 
 

 
 

 
 

 
 

Allowance for doubtful accounts
$
14

 
$
3

 
$
(4
)
 
$
—

 
$
13

Year Ended December 31, 2012
 

 
 

 
 

 
 

 
 

Allowance for doubtful accounts
$
13

 
$
16

 
$
(15
)
 
$
—

 
$
14