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INCOME TAX EXPENSE Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended | 24 Months Ended
--- | --- | --- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2020 | Dec. 31, 2017 | Dec. 31, 2019
Disclosure Of Major Components Of Tax Expense (Income) [Line Items] |  |  |  |  |  |  |
Income tax expense (recovery) | $ 41 | $ 116 | $ 208 | $ 317 |  |  |
Average effective tax rate |  |  | 43.00% |  |  |  |
Applicable tax rate |  |  | (36.00%) |  |  |  |
Argentina |  |  |  |  |  |  |
Disclosure Of Major Components Of Tax Expense (Income) [Line Items] |  |  |  |  |  |  |
Applicable tax rate |  |  |  |  | 25.00% | 35.00% | 30.00%
Net currency translation losses on deferred tax balances |  |  |  | $ 19 |  |  |
Dividend distribution tax |  |  |  |  | 13.00% |  | 7.00%
Deferred tax recovery due to inflation |  |  | $ 70 |  |  |  |

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