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DERIVATIVE FINANCIAL INSTRUMENTS - Notional Amount of Foreign Exchange Derivative Instruments (Details) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
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Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items] |  |
Notional Amount (U.S. Dollars) | $ 8,829 | $ 8,904
Foreign exchange contracts |  |
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items] |  |
Notional Amount (U.S. Dollars) | 3,816 | 4,488
Foreign exchange contracts | Australian dollars |  |
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items] |  |
Notional Amount (U.S. Dollars) | $ 1,214 | $ 2,133
Average Exchange Rate | 74.00% | 73.00%
Foreign exchange contracts | British pounds |  |
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items] |  |
Notional Amount (U.S. Dollars) | $ 2,069 | $ 1,810
Average Exchange Rate | 130.00% | 130.00%
Foreign exchange contracts | European Union euros |  |
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items] |  |
Notional Amount (U.S. Dollars) | $ 491 | $ 374
Average Exchange Rate | 117.00% | 114.00%
Foreign exchange contracts | Brazilian reais |  |
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items] |  |
Notional Amount (U.S. Dollars) | $ 0 | $ 144
Average Exchange Rate | 0.00% | 337.00%
Foreign exchange contracts | Canadian dollars |  |
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items] |  |
Notional Amount (U.S. Dollars) | $ 42 | $ 27
Average Exchange Rate | 77.00% | 76.00%

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- Definition The average rate of a hedging instrument. [Refer: Hedging instruments [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 23B -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-01&anchor=para_23B_b&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table. + References No definition available. + Details
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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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