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ACCOUNTS RECEIVABLE AND OTHER
 12 Months Ended
Dec. 31, 2018
Subclassifications of assets, liabilities and equities [abstract]  
ACCOUNTS RECEIVABLE AND OTHER
ACCOUNTS RECEIVABLE AND OTHER
US$ MILLIONS
 
2018
 
2017
Current:
 
 
 
 
Accounts receivable
 
$
1,044

 
$
738

Prepayments & other assets
 
127

 
100

Total current
 
$
1,171

 
$
838

 
 
 
 
 
Non-current:
 
 
 
 
Tax recovery receivables
 
$
39

 
$
52

Other assets
 
180

 
221

Total non-current
 
$
219

 
$
273