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SUPPLEMENTAL CASH FLOW INFORMATION
 6 Months Ended
Jun. 30, 2019
Cash Flow Statement [Abstract]  
SUPPLEMENTAL CASH FLOW INFORMATION
 SUPPLEMENTAL CASH FLOW INFORMATION
 
 
Six Months Ended
(US$ MILLIONS)
 
June 30, 2019
 
June 30, 2018
Interest paid
 
$
417

 
$
94

Income taxes paid
 
$
118

 
$
30


Amounts paid and received for interest were reflected as operating cash flows in the unaudited interim condensed consolidated statements of cash flow.
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, 2019
 
June 30, 2018
Accounts receivable
 
$
(147
)
 
$
(324
)
Inventory
 
80

 
(73
)
Prepayments and other
 
(12
)
 
(79
)
Accounts payable and other
 
557

 
(38
)
Changes in non-cash working capital, net
 
$
478

 
$
(514
)