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FINANCIAL RISK MANAGEMENT - Sensitivity Analysis For Foreign Currency Risk (Details) - Foreign currency risk - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
GBP |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |
Impact of 10% decrease on net income (loss) | $ (5) | $ 10 | $ 10
Impact of 10% increase on net income (loss) | 5 | (10) | (10)
Impact of 10% decrease on parent equity | (150) | 131 | 103
Impact of 10% increase on parent equity | 150 | (131) | (103)
BRL |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |
Impact of 10% decrease on net income (loss) | (12) | 13 | 14
Impact of 10% increase on net income (loss) | 12 | (13) | (14)
Impact of 10% decrease on parent equity | (14) | 34 | 43
Impact of 10% increase on parent equity | $ 14 | $ (34) | $ (43)

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