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INCOME TAXES - Deferred Income Tax Balances (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
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Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Deferred income tax assets, gross | $ 394 | $ 361 |
Deferred income tax liabilities, gross | (3,740) | (3,144) |
Deferred income tax assets | 75 | 66 |
Deferred income tax liabilities | (3,421) | (2,849) |
Net deferred income tax liabilities | (3,346) | (2,783) | $ (1,538)
Tax losses carried forward |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Deferred income tax assets, gross | 394 | 361 |
Net deferred income tax liabilities | 394 | 361 | $ 357
Property, plant and equipment and investment properties |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Deferred income tax liabilities, gross | (1,702) | (1,374) |
Intangible assets |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Deferred income tax liabilities, gross | (2,115) | (1,761) |
Financial instruments and other |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Deferred income tax liabilities, gross | $ 77 | $ (9) |

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- Definition The amounts of income taxes recoverable in future periods in respect of: (a) deductible temporary differences; (b) the carryforward of unused tax losses; and (c) the carryforward of unused tax credits. [Refer: Temporary differences [member]; Unused tax credits [member]; Unused tax losses [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2017-01-01 -Paragraph 81 -Subparagraph g -Clause i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=12&date=2017-03-01&anchor=para_81_g_i&doctype=Standard -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 54 -Subparagraph o -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_54_o&doctype=Standard -URIDate 2017-03-09 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 56 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_56&doctype=Standard -URIDate 2017-03-09 + Details
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