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FINANCIAL ASSETS (Tables)
 12 Months Ended
Dec. 31, 2018
Financial Instruments [Abstract]  
Disclosure of financial assets [Table Text Block]
US$ MILLIONS
 
2018
 
2017
Current:
 
 
 
 
Marketable securities
 
$
173

 
$
85

Foreign currency forward contracts
 
123

 
10

Loans and receivables
 
61

 
43

Other
 
67

 
54

Total current
 
$
424

 
$
192

 
 
 
 
 
Non-current:
 
 
 
 
Foreign currency forward contracts
 
$
118

 
$
226

Cross currency interest rate swaps
 
594

 
243

Loans and receivables
 
145

 
210

Other
 
64

 
51

Total non-current
 
$
921

 
$
730