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SUPPLEMENTAL CASH FLOW INFORMATION (Tables)
 12 Months Ended
Dec. 31, 2018
Cash Flow Statement [Abstract]  
Disclosure of interest and income taxes paid
 
 
For the year ended
December 31,
US$ MILLIONS
 
2018
 
2017
 
2016
Interest paid
 
$
507

 
$
451

 
$
366

Income taxes paid
 
$
427

 
$
132

 
$
33
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
 
2018
 
2017
 
2016
Accounts receivable
 
$
176

 
$
(31
)
 
$
31

Prepayments and other
 
5

 
4

 
3

Accounts payable and other
 
(305
)
 
158

 
11

Changes in non-cash working capital, net
 
$
(124
)
 
$
131

 
$
45