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SUPPLEMENTAL CASH FLOW INFORMATION (Tables)
 12 Months Ended
Dec. 31, 2017
Cash Flow Statement [Abstract]  
Disclosure of interest and income taxes paid
 
 
For the Year Ended
December 31,
US$ MILLIONS
 
2017
 
2016
 
2015
Interest paid
 
$
451

 
$
366

 
$
332

Income taxes paid
 
$
132

 
$
33

 
$
22
Disclosure of changes in non-cash working capital
Details of “Changes in non-cash working capital, net” on the Consolidated Statements of Cash Flows are as follows:
 
 
For the Year Ended
December 31,
US$ MILLIONS
 
2017
 
2016
 
2015
Accounts receivable
 
$
(31
)
 
$
31

 
$
27

Prepayments and other
 
4

 
3

 
1

Accounts payable and other
 
158

 
11

 
(110
)
Changes in non-cash working capital, net
 
$
131

 
$
45

 
$
(82
)