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DEFERRED INCOME TAXES - Expiry Dates of Tax Losses and AMT (Details) - Non-capital tax losses
$ in Millions
Dec. 31, 2017
USD ($)
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Unused tax losses for which no deferred tax asset recognised $ 12,892
Canada  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Unused tax losses for which no deferred tax asset recognised 2,093
Argentina  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Unused tax losses for which no deferred tax asset recognised 271
Barbados  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Unused tax losses for which no deferred tax asset recognised 6,614
Chile  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Unused tax losses for which no deferred tax asset recognised 1,052
Tanzania  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Unused tax losses for which no deferred tax asset recognised 1,756
Zambia  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Unused tax losses for which no deferred tax asset recognised 531
Other  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Unused tax losses for which no deferred tax asset recognised 575
2018  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Unused tax losses for which no deferred tax asset recognised 4,849
2018 | Canada  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Unused tax losses for which no deferred tax asset recognised 0
2018 | Argentina  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Unused tax losses for which no deferred tax asset recognised 0
2018 | Barbados  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Unused tax losses for which no deferred tax asset recognised 4,727
2018 | Chile  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Unused tax losses for which no deferred tax asset recognised 0
2018 | Tanzania  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Unused tax losses for which no deferred tax asset recognised 0
2018 | Zambia  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Unused tax losses for which no deferred tax asset recognised 115
2018 | Other  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Unused tax losses for which no deferred tax asset recognised 7
2019  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Unused tax losses for which no deferred tax asset recognised 922
2019 | Canada  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Unused tax losses for which no deferred tax asset recognised 0
2019 | Argentina  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Unused tax losses for which no deferred tax asset recognised 0
2019 | Barbados  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Unused tax losses for which no deferred tax asset recognised 922
2019 | Chile  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Unused tax losses for which no deferred tax asset recognised 0
2019 | Tanzania  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Unused tax losses for which no deferred tax asset recognised 0
2019 | Zambia  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Unused tax losses for which no deferred tax asset recognised 0
2019 | Other  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Unused tax losses for which no deferred tax asset recognised 0
2020  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Unused tax losses for which no deferred tax asset recognised 217
2020 | Canada  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Unused tax losses for which no deferred tax asset recognised 0
2020 | Argentina  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Unused tax losses for which no deferred tax asset recognised 0
2020 | Barbados  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Unused tax losses for which no deferred tax asset recognised 217
2020 | Chile  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Unused tax losses for which no deferred tax asset recognised 0
2020 | Tanzania  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Unused tax losses for which no deferred tax asset recognised 0
2020 | Zambia  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Unused tax losses for which no deferred tax asset recognised 0
2020 | Other  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Unused tax losses for which no deferred tax asset recognised 0
2021  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Unused tax losses for which no deferred tax asset recognised 296
2021 | Canada  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Unused tax losses for which no deferred tax asset recognised 0
2021 | Argentina  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Unused tax losses for which no deferred tax asset recognised 271
2021 | Barbados  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Unused tax losses for which no deferred tax asset recognised 13
2021 | Chile  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Unused tax losses for which no deferred tax asset recognised 0
2021 | Tanzania  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Unused tax losses for which no deferred tax asset recognised 0
2021 | Zambia  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Unused tax losses for which no deferred tax asset recognised 12
2021 | Other  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Unused tax losses for which no deferred tax asset recognised 0
After 2021  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Unused tax losses for which no deferred tax asset recognised 3,232
After 2021 | Canada  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Unused tax losses for which no deferred tax asset recognised 2,093
After 2021 | Argentina  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Unused tax losses for which no deferred tax asset recognised 0
After 2021 | Barbados  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Unused tax losses for which no deferred tax asset recognised 735
After 2021 | Chile  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Unused tax losses for which no deferred tax asset recognised 0
After 2021 | Tanzania  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Unused tax losses for which no deferred tax asset recognised 0
After 2021 | Zambia  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Unused tax losses for which no deferred tax asset recognised 404
After 2021 | Other  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Unused tax losses for which no deferred tax asset recognised 0
No expiry date  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Unused tax losses for which no deferred tax asset recognised 3,376
No expiry date | Canada  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Unused tax losses for which no deferred tax asset recognised 0
No expiry date | Argentina  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Unused tax losses for which no deferred tax asset recognised 0
No expiry date | Barbados  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Unused tax losses for which no deferred tax asset recognised 0
No expiry date | Chile  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Unused tax losses for which no deferred tax asset recognised 1,052
No expiry date | Tanzania  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Unused tax losses for which no deferred tax asset recognised 1,756
No expiry date | Zambia  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Unused tax losses for which no deferred tax asset recognised 0
No expiry date | Other  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Unused tax losses for which no deferred tax asset recognised $ 568