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INVENTORY
 12 Months Ended
Dec. 31, 2017
Inventories [Abstract]  
INVENTORY
INVENTORY
US$ MILLIONS
 
2017
 
2016
Current:
 
 
 
 
Natural gas inventory
 
$
84

 
$
82

Raw materials and consumables
 
24

 
19

Carrying amount of inventories
 
$
108

 
$
101


During the year ended December 31, 2017, Brookfield Infrastructure recognized $418 million (2016: $154 million, 2015: $nil) worth of inventories as an expense in the Consolidated Statements of Operating Results and $nil (2016: $nil, 2015: $nil) relating to impairments of inventory.