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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
 
 
For the Year Ended
December 31,
US$ MILLIONS
 
2017
 
2016
 
2015
Interest paid
 
$
451

 
$
366

 
$
332

Income taxes paid
 
$
132

 
$
33

 
$
22


Amounts paid and received for interest were reflected as operating cash flows in the Consolidated Statements of Cash Flows. Interest paid is net of debt related hedges.
Amounts paid for income taxes were reflected as either operating cash flows or investing cash flows in the Consolidated Statements of Cash Flows depending upon the nature of the underlying transaction.
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
)