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INCOME TAX EXPENSE - Reconciliation to Canadian Statutory Rate (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Income Tax [Abstract] |  |
Tax expense (income) at applicable tax rate | $ 1,311 | $ 1,684
Increase (decrease) due to: |  |
Allowances and special tax deductions | (151) | (129)
Impact of foreign tax rates | (32) | (264)
Expenses not tax deductible | 154 | 78
Impairment charges not recognized in deferred tax assets | 0 | 45
Net currency translation (gains) losses on deferred tax balances | (19) | 43
Tax impact from pass-through entities and equity accounted investments | (309) | (140)
Current year tax (gains) losses not recognized | (9) | 8
Sale of 50% interest in Kalgoorlie | 0 | (12)
Tax Effect from De-recognition in Deferred Tax Assets | (61) | 4
Adjustments in respect of prior years | (53) | (13)
Increase to income tax related contingent liabilities | 42 | 21
Impact of tax rate changes | 1 | (35)
Withholding taxes | 100 | 54
Mining taxes | 383 | 412
Tax impact of amounts recognized within accumulated OCI | (21) | 0
Other items | (4) | 3
Income tax expense | $ 1,332 | $ 1,783

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