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SUPPLEMENTAL CASH FLOW INFORMATION (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Cash Flow Statement [Abstract] |  |  |
Interest paid | $ 507 | $ 451 | $ 366
Income taxes paid | 427 | 132 | 33
Changes in non-cash working capital |  |  |
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

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- Definition Adjustments for decrease (increase) in trade accounts receivable to reconcile profit (loss) to net cash flow from (used in) operating activities. [Refer: Profit (loss)] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 7 -IssueDate 2017-01-01 -Paragraph 20 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=7&date=2017-03-01&anchor=para_20_a&doctype=Standard -URIDate 2017-03-09 + Details
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