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FINANCIAL RISK MANAGEMENT - Maximum Exposure Credit Risk (Details) - Credit risk - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
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Disclosure of detailed information about financial instruments [line items] |  |
Maximum exposure to credit risk | $ 2,475 | $ 2,639
Cash and equivalents |  |
Disclosure of detailed information about financial instruments [line items] |  |
Maximum exposure to credit risk | 2,234 | 2,389
Accounts receivable |  |
Disclosure of detailed information about financial instruments [line items] |  |
Maximum exposure to credit risk | 239 | 249
Derivatives |  |
Disclosure of detailed information about financial instruments [line items] |  |
Maximum exposure to credit risk | $ 2 | $ 1

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- Definition The amount that best represents the maximum exposure to credit risk without taking into account any collateral held or other credit enhancements (for example, netting agreements that do not qualify for offset in accordance with IAS 32). [Refer: Credit risk [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2018-01-01 -Name IFRS -Number 7 -IssueDate 2017-01-01 -Paragraph 35K -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-01&anchor=para_35K_a&doctype=Standard -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Note Expiry date 2018-01-01 -Name IFRS -Number 7 -IssueDate 2017-01-01 -Paragraph 36 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-02&anchor=para_36_a&doctype=Standard&book=B -URIDate 2017-03-09 + Details
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