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FAIR VALUE MEASUREMENTS - Assets and Liabilities Measured on Recurring Basis (Details) - USD ($) $ in Millions | Jun. 30, 2019 | Dec. 31, 2018
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Level 1 of fair value hierarchy [member] | Estimated fair value | Derivatives |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities1 [Line Items] |  |
Total liabilities | $ 0 |
Total liabilities | 14,135 | $ 13,246
Carrying amount |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities1 [Line Items] |  |
Financial assets | 747 | 771
Financial liabilities | 6,326 | 6,038
Carrying amount | Debt |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities1 [Line Items] |  |
Financial liabilities | 5,807 | 5,738
Carrying amount | Derivatives |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities1 [Line Items] |  |
Financial liabilities | 0 | 3
Carrying amount | Other liabilities |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities1 [Line Items] |  |
Financial liabilities | 519 | 297
Carrying amount | Other assets |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities1 [Line Items] |  |
Financial assets | 524 | 559
Carrying amount | Other investments |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities1 [Line Items] |  |
Financial assets | 221 | 209
Carrying amount | Derivatives |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities1 [Line Items] |  |
Financial assets | 2 | 3
Estimated fair value |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities1 [Line Items] |  |
Financial assets | 747 | 771
Financial liabilities | 7,444 | 6,483
Estimated fair value | Debt |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities1 [Line Items] |  |
Financial liabilities | 6,925 | 6,183
Estimated fair value | Derivatives |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities1 [Line Items] |  |
Total liabilities | (2) |
Financial liabilities | 0 | 3
Estimated fair value | Other liabilities |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities1 [Line Items] |  |
Financial liabilities | 519 | 297
Estimated fair value | Other assets |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities1 [Line Items] |  |
Financial assets | 524 | 559
Estimated fair value | Other investments |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities1 [Line Items] |  |
Financial assets | 221 | 209
Estimated fair value | Derivatives |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities1 [Line Items] |  |
Financial assets | $ 2 | $ 3

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- Definition The amount of assets that are: (a) cash; (b) an equity instrument of another entity; (c) a contractual right: (i) to receive cash or another financial asset from another entity; or (ii) to exchange financial assets or financial liabilities with another entity under conditions that are potentially favourable to the entity; or (d) a contract that will, or may be, settled in the entity’s own equity instruments and is: (i) a non-derivative for which the entity is, or may be, obliged to receive a variable number of the entity’s own equity instruments; or (ii) a derivative that will, or may be, settled other than by the exchange of a fixed amount of cash or another financial asset for a fixed number of the entity’s own equity instruments. For this purpose the entity’s own equity instruments do not include puttable financial instruments classified as equity instruments in accordance with paragraphs 16A-16B of IAS 32, instruments that impose on the entity an obligation to deliver to another party a pro rata share of the net assets of the entity only on liquidation and are classified as equity instruments in accordance with paragraphs 16C-16D of IAS 32, or instruments that are contracts for the future receipt or delivery of the entity’s own equity instruments. [Refer: Financial instruments, class [member]; Financial liabilities] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2018-01-01 -Paragraph 25 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2018-03-01&anchor=para_25&doctype=Standard -URIDate 2018-03-16 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2018-01-01 -Paragraph 35H -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2018-03-01&anchor=para_35H&doctype=Standard -URIDate 2018-03-16 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2018-01-01 -Paragraph 35I -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2018-03-01&anchor=para_35I&doctype=Standard -URIDate 2018-03-16 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2018-01-01 -Paragraph 35M -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2018-03-01&anchor=para_35M&doctype=Standard -URIDate 2018-03-16 Reference 5: http://www.xbrl.org/2003/role/exampleRef -Name IFRS -Number 7 -IssueDate 2018-01-01 -Paragraph 35N -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2018-03-01&anchor=para_35N&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The amount of liabilities that are: (a) a contractual obligation: (i) to deliver cash or another financial asset to another entity; or (ii) to exchange financial assets or financial liabilities with another entity under conditions that are potentially unfavourable to the entity; or (b) a contract that will, or may be, settled in the entity’s own equity instruments and is: (i) a non-derivative for which the entity is, or may be, obliged to deliver a variable number of the entity’s own equity instruments; or (ii) a derivative that will, or may be, settled other than by the exchange of a fixed amount of cash or another financial asset for a fixed number of the entity’s own equity instruments. For this purpose, rights, options or warrants to acquire a fixed number of the entity’s own equity instruments for a fixed amount of any currency are equity instruments if the entity offers the rights, options or warrants pro rata to all of its existing owners of the same class of its own non-derivative equity instruments. Also, for those purposes the entity’s own equity instruments do not include puttable financial instruments that are classified as equity instruments in accordance with paragraphs 16A-16B of IAS 32, instruments that impose on the entity an obligation to deliver to another party a pro rata share of the net assets of the entity only on liquidation and are classified as equity instruments in accordance with paragraphs 16C-16D of IAS 32, or instruments that are contracts for the future receipt or delivery of the entity’s own equity instruments. As an exception, an instrument that meets the definition of a financial liability is classified as an equity instrument if it has all the features and meets the conditions in paragraphs 16A-16B or paragraphs 16C-16D of IAS 32. [Refer: Financial instruments, class [member]; Financial assets; Derivatives [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2018-01-01 -Paragraph 25 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2018-03-01&anchor=para_25&doctype=Standard -URIDate 2018-03-16 + Details
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