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ACCOUNTS RECEIVABLE AND OTHER
 12 Months Ended
Dec. 31, 2017
Subclassifications of assets, liabilities and equities [abstract]  
ACCOUNTS RECEIVABLE AND OTHER
ACCOUNTS RECEIVABLE AND OTHER
US$ MILLIONS
 
2017
 
2016
Current:
 
 
 
 
Accounts receivable
 
$
738

 
$
395

Prepayments & other assets
 
100

 
109

Total current
 
$
838

 
$
504

 
 
 
 
 
Non-current:
 
 
 
 
Tax recovery receivables
 
$
52

 
$
55

Other assets
 
221

 
110

Total non-current
 
$
273

 
$
165