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SUPPLEMENTAL CASH FLOW INFORMATION
 12 Months Ended
Dec. 31, 2017
Cash Flow Statement [Abstract]  
SUPPLEMENTAL CASH FLOW INFORMATION
SUPPLEMENTAL CASH FLOW INFORMATION
 
 
Year Ended December 31
(US$ MILLIONS)
 
2017
 
2016
 
2015
Interest paid
 
$
103

 
$
74

 
46

Income taxes paid
 
$
41

 
$
9

 
4


Amounts paid and received for interest were reflected as operating cash flows in the consolidated statements of cash flow.
Details of "Changes in non-cash working capital, net" on the consolidated statements of cash flow are as follows:
 
 
Year Ended December 31
(US$ MILLIONS)
 
2017
 
2016
 
2015
Accounts receivable
 
$
(520
)
 
$
(55
)
 
(516
)
Inventory
 
(259
)
 
60

 
52

Prepayments and other
 
185

 
(123
)
 
(122
)
Accounts payable and other
 
503

 
127

 
646

Changes in non-cash working capital, net
 
$
(91
)
 
$
9

 
$
60


The following table presents the change in the balance of liabilities arising from financing activities as at December 31, 2017:
(US$ MILLIONS)
 
Borrowings
Balance at January 1, 2017
 
$
1,551

Cash flows
 
349

Non-cash changes:
 
 
Acquisitions / (Disposition) of subsidiaries
 
1,386

Foreign currency translation
 
(7
)
Fair value
 
—

Other changes
 
(14
)
Balance at December 31, 2017
 
$
3,265