XML 72 R50.htm IDEA: XBRL DOCUMENT v3.10.0.1
CASH AND CASH EQUIVALENTS (Tables)
 12 Months Ended
Dec. 31, 2018
Cash and cash equivalents [abstract]  
Disclosure of cash and cash equivalents
US$ MILLIONS
 
2018
 
2017
Cash
 
$
294

 
$
258

Cash equivalents(1)
 
150

 
83

Restricted cash(2)
 
96

 
33

Total cash and cash equivalents
 
$
540

 
$
374

 
(1)
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.