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FINANCIAL INSTRUMENTS - Fair Values of Derivative Instruments (Details) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
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Disclosure of detailed information about financial instruments [line items] |  |
Asset Derivatives | $ 3 | $ 2
Liability Derivatives | 32 | 78
Total derivatives not designated as hedging instruments |  |
Disclosure of detailed information about financial instruments [line items] |  |
Asset Derivatives | 2 | 1
Liability Derivatives | 7 | 7
Commodity contracts | Other assets |  |
Disclosure of detailed information about financial instruments [line items] |  |
Asset Derivatives | 2 | 1
Commodity contracts | Other liabilities |  |
Disclosure of detailed information about financial instruments [line items] |  |
Liability Derivatives | 7 | 7
Total derivatives classified as hedging instruments |  |
Disclosure of detailed information about financial instruments [line items] |  |
Asset Derivatives | 1 | 1
Liability Derivatives | 25 | 71
Interest rate contracts | Other assets |  |
Disclosure of detailed information about financial instruments [line items] |  |
Asset Derivatives | 1 | 1
Interest rate contracts | Other liabilities |  |
Disclosure of detailed information about financial instruments [line items] |  |
Liability Derivatives | 0 | 0
Commodity contracts | Other assets |  |
Disclosure of detailed information about financial instruments [line items] |  |
Asset Derivatives | 0 | 0
Commodity contracts | Other liabilities |  |
Disclosure of detailed information about financial instruments [line items] |  |
Liability Derivatives | $ 25 | $ 71

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- Definition The amount of financial assets classified as derivative instruments. [Refer: Financial assets; Derivatives [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_55&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The amount of financial liabilities classified as derivative instruments. [Refer: Financial assets; Derivatives [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_55&doctype=Standard -URIDate 2017-03-09 + Details
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