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INVENTORY (Tables)
 12 Months Ended
Dec. 31, 2019
Inventories [Abstract]  
Disclosure of inventories
US$ MILLIONS
 
2019
 
2018
Current:
 
 
 
 
Natural gas inventory
 
$
127

 
$
94

Raw materials and other
 
115

 
47

Carrying amount of inventories
 
$
242

 
$
141