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SUPPLEMENTAL CASH FLOW INFORMATION (Tables)
 6 Months Ended
Jun. 30, 2018
Cash Flow Statement [Abstract]  
Disclosure of interest and income taxes paid
 
 
Six Months Ended
(US$ MILLIONS)
 
June 30, 2018
 
June 30, 2017
Interest paid
 
$
94

 
$
41

Income taxes paid
 
$
30

 
$
20
Disclosure of changes in non-cash working capital
Details of "Changes in non-cash working capital, net" on the unaudited interim condensed consolidated statements of cash flow are as follows:
 
 
Six Months Ended
(US$ MILLIONS)
 
June 30, 2018
 
June 30, 2017
Accounts receivable
 
$
(324
)
 
$
10

Inventory
 
(73
)
 
(32
)
Prepayments and other
 
(79
)
 
22

Accounts payable and other
 
(38
)
 
(370
)
Changes in non-cash working capital, net
 
$
(514
)
 
$
(370
)