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DEFERRED INCOME TAXES - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Undistributed profits of foreign subsidiaries | $ 5,861 |
Deferred tax assets | 259 | $ 1,069
Deferred tax assets expected to be realized in more than one year | 242 |
Deferred tax liabilities | 1,236 | 1,245
Deferred tax liabilities expected to be realized in more than one year | 1,211 |
Unused tax losses, net | 8,327 |
Deductible temporary differences for which no deferred tax asset is recognised | 3,043 | 2,449
Canada |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Deductible temporary differences for which no deferred tax asset is recognised | 1,087 | 388
2019 |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax losses, net | 1,843 |
2020 |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax losses, net | 435 |
2021 |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax losses, net | 107 |
2022 |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax losses, net | 590 |
After 2023 |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax losses, net | 3,483 |
No expiry date |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax losses, net | 1,869 |
Subsidiaries |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Tax on undistributed earnings | 211 |
Deferred tax liability on undistributed earnings | 47 |
Subsidiaries | Foreign countries [member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Deferred tax assets | 83 | 98
Non-capital tax losses |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Deductible temporary differences for which no deferred tax asset is recognised | 1,134 | 690
Capital tax losses | No expiry date |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Deductible temporary differences for which no deferred tax asset is recognised | 447 | 452
Alternative minimum tax (“AMT”) credits |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Deferred tax assets | 37 | 0
Other |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Deferred tax assets | 12 | 21
Deductible temporary differences for which no deferred tax asset is recognised | $ 1,462 | $ 0

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