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DERIVATIVE FINANCIAL INSTRUMENTS - Notional Amount of Foreign Exchange Derivative Instruments (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
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Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items] |  |
Notional Amount (U.S. Dollars) | $ 14,743 | $ 15,855
Foreign exchange contracts |  |
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items] |  |
Notional Amount (U.S. Dollars) | 3,274 | 4,626
Foreign exchange contracts | British pounds |  |
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items] |  |
Notional Amount (U.S. Dollars) | $ 1,404 | $ 2,882
Average Exchange Rate | 131.00% | 131.00%
Foreign exchange contracts | Canadian dollars |  |
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items] |  |
Notional Amount (U.S. Dollars) | $ 612 | $ 4
Average Exchange Rate | 75.00% | 76.00%
Foreign exchange contracts | Australian dollars |  |
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items] |  |
Notional Amount (U.S. Dollars) | $ 609 | $ 1,102
Average Exchange Rate | 69.00% | 73.00%
Foreign exchange contracts | Indian rupees |  |
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items] |  |
Notional Amount (U.S. Dollars) | $ 308 | $ 0
Average Exchange Rate | 1.30% | 0.00%
Foreign exchange contracts | European Union euros |  |
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items] |  |
Notional Amount (U.S. Dollars) | $ 239 | $ 365
Average Exchange Rate | 121.00% | 125.00%
Foreign exchange contracts | Chilean pesos |  |
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items] |  |
Notional Amount (U.S. Dollars) | $ 34 | $ 242
Average Exchange Rate | 0.13% | 0.15%
Foreign exchange contracts | COP |  |
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items] |  |
Notional Amount (U.S. Dollars) | $ 28 | $ 19
Average Exchange Rate | 0.03% | 0.03%
Foreign exchange contracts | Peruvian soles |  |
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items] |  |
Notional Amount (U.S. Dollars) | $ 12 | $ 12
Average Exchange Rate | 28.00% | 29.00%
Foreign exchange contracts | Other |  |
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items] |  |
Notional Amount (U.S. Dollars) | $ 28 | $ 0
Average Exchange Rate | 0.00% | 0.00%

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- Definition The average rate of a hedging instrument. [Refer: Hedging instruments [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2020-01-01 -Paragraph 23B -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2020-en-r&anchor=para_23B_b&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The nominal or face amount of a financial instrument, used to calculate payments made on that instrument. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_112_c&doctype=Standard -URIDate 2020-01-01 + Details
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