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INCOME TAXES - Deferred Income Tax Balances (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
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Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Deferred income tax assets, gross | $ 1,410 | $ 761 |
Deferred income tax liabilities, gross | (5,898) | (5,269) |
Deferred income tax assets | 124 | 112 |
Deferred income tax liabilities | (4,612) | (4,620) |
Net deferred income tax liabilities | (4,488) | (4,508) | $ (3,346)
Tax losses carried forward |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Deferred income tax assets, gross | 1,002 | 397 |
Net deferred income tax liabilities | 999 | 397 | $ 394
Deferred tax assets recognized based on future projected profits | 80 | 67 |
Financial instruments and other |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Deferred income tax assets, gross | 408 | 364 |
Property, plant and equipment |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Deferred income tax liabilities, gross | (3,367) | (2,541) |
Intangible assets |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Deferred income tax liabilities, gross | (2,458) | (2,714) |
Investment in associates and investment properties |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Deferred income tax liabilities, gross | $ (73) | $ (14) |

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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 2020-01-01 -Paragraph 81 -Subparagraph g -Clause i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=12&code=ifrs-tx-2020-en-r&anchor=para_81_g_i&doctype=Standard -URIDate 2020-01-01 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 54 -Subparagraph o -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_54_o&doctype=Standard -URIDate 2020-01-01 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 56 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_56&doctype=Standard -URIDate 2020-01-01 + Details
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