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FINANCIAL INSTRUMENTS - Cash Flow Hedge Gains (Losses) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
Other current assets |  |
Effective portion of change in fair value of hedging instruments | $ (16) | $ 16
Amount of gain (loss) transferred from OCI into income (effective portion) | (23) | (64)
Cash flow hedge |  |
Other current assets |  |
Effective portion of change in fair value of hedging instruments | (19) | 25
Amount of gain (loss) transferred from OCI into income (effective portion) | (27) | (72)
Amount of gain (loss) recognized in income (ineffective portion and amount excluded from effectiveness testing) | 5 | 0
Cash flow hedge | Interest rate contracts |  |
Other current assets |  |
Effective portion of change in fair value of hedging instruments | (1) | 0
Cash flow hedge | Interest rate contracts | Finance income/ finance costs |  |
Other current assets |  |
Amount of gain (loss) transferred from OCI into income (effective portion) | (3) | (2)
Cash flow hedge | Foreign exchange contracts |  |
Other current assets |  |
Effective portion of change in fair value of hedging instruments | 0 | 2
Cash flow hedge | Foreign exchange contracts | Cost of sales/general and administrative costs/PP&E |  |
Other current assets |  |
Amount of gain (loss) transferred from OCI into income (effective portion) | 0 | (28)
Cash flow hedge | Commodity contracts |  |
Other current assets |  |
Effective portion of change in fair value of hedging instruments | (18) | 23
Cash flow hedge | Commodity contracts | Revenue/cost of sales |  |
Other current assets |  |
Amount of gain (loss) transferred from OCI into income (effective portion) | (24) | (42)
Derivative Instruments Not Designated as Hedging |  |
Other current assets |  |
Amount of gain (loss) recognized in income (ineffective portion and amount excluded from effectiveness testing) | (5) | 0
Derivative Instruments Not Designated as Hedging | Interest rate contracts |  |
Other current assets |  |
Amount of gain (loss) recognized in income (ineffective portion and amount excluded from effectiveness testing) | 0 | 0
Derivative Instruments Not Designated as Hedging | Foreign exchange contracts |  |
Other current assets |  |
Amount of gain (loss) recognized in income (ineffective portion and amount excluded from effectiveness testing) | 0 | 0
Derivative Instruments Not Designated as Hedging | Commodity contracts |  |
Other current assets |  |
Amount of gain (loss) recognized in income (ineffective portion and amount excluded from effectiveness testing) | $ (5) | $ 0

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- Definition The gains (losses) recognised in other comprehensive income on cash flow hedges, net of tax. [Refer: Cash flow hedges [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Note Expiry date 2018-01-01 -Name IFRS -Number 7 -IssueDate 2017-01-01 -Paragraph 23 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-02&anchor=para_23_c&doctype=Standard&book=B -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 91 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_91_a&doctype=Standard -URIDate 2017-03-09 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2018-01-01 -Name IFRS -Number 7 -IssueDate 2017-01-01 -Paragraph 24C -Subparagraph b -Clause i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-01&anchor=para_24C_b_i&doctype=Standard -URIDate 2017-03-09 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2018-01-01 -Name IFRS -Number 7 -IssueDate 2017-01-01 -Paragraph 24E -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-01&anchor=para_24E_a&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The gains (losses) on the ineffective portion of cash flow hedges recognised in profit or loss. [Refer: Cash flow hedges [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Note Expiry date 2018-01-01 -Name IFRS -Number 7 -IssueDate 2017-01-01 -Paragraph 24 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-02&anchor=para_24_b&doctype=Standard&book=B -URIDate 2017-03-09 + Details
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