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CASH AND CASH EQUIVALENTS (Tables)
 12 Months Ended
Dec. 31, 2017
Cash and cash equivalents [abstract]  
Disclosure of cash and cash equivalents
US$ MILLIONS
 
2017
 
2016
Cash
 
$
258

 
$
652

Restricted cash(1)
 
33

 
84

Cash equivalents(2)
 
83

 
50

Total cash and cash equivalents
 
$
374

 
$
786

 
(1)
Restricted cash primarily relates to our partnership’s financing arrangements, including debt service accounts.
(2)
Short-term, highly liquid investments that are readily convertible to known amounts of cash and which are subject to an insignificant risk of changes in value.