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DEFERRED INCOME TAXES - Deferred Tax Assets Not Recognized (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
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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 | $ 1,092 | $ 1,082
No expiry date | 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 | 323 | 331
No expiry date | Other |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Deductible temporary differences for which no deferred tax asset is recognised | $ 1,638 | $ 1,748

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