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FINANCIAL RISK MANAGEMENT - Expected Maturity of Financial Assets and Liablities (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Disclosure of detailed information about financial instruments [line items] |  |  |
Cash and equivalents | $ 5,188 | $ 3,314 | $ 1,571
Accounts receivable | 558 | 363 |
Liquidity risk |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Cash and equivalents | 5,188 | 3,314 |
Accounts receivable | 558 | 363 |
Derivative assets | 40 | 0 |
Trade and other payables | 1,458 | 1,155 |
Debt | 5,181 | 5,564 |
Derivative liabilities | 0 | 0 |
Other liabilities | 382 | 209 |
Liquidity risk | Less than 1 year |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Cash and equivalents | 5,188 | 3,314 |
Accounts receivable | 558 | 363 |
Derivative assets | 0 | 0 |
Trade and other payables | 1,458 | 1,155 |
Debt | 20 | 39 |
Derivative liabilities | 0 | 0 |
Other liabilities | 31 | 55 |
Liquidity risk | 1 to 3 years |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Cash and equivalents | 0 | 0 |
Accounts receivable | 0 | 0 |
Derivative assets | 40 | 0 |
Trade and other payables | 0 | 0 |
Debt | 16 | 371 |
Derivative liabilities | 0 | 0 |
Other liabilities | 72 | 52 |
Liquidity risk | 3 to 5 years |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Cash and equivalents | 0 | 0 |
Accounts receivable | 0 | 0 |
Derivative assets | 0 | 0 |
Trade and other payables | 0 | 0 |
Debt | 20 | 13 |
Derivative liabilities | 0 | 0 |
Other liabilities | 36 | 9 |
Liquidity risk | Over 5 years |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Cash and equivalents | 0 | 0 |
Accounts receivable | 0 | 0 |
Derivative assets | 0 | 0 |
Trade and other payables | 0 | 0 |
Debt | 5,125 | 5,141 |
Derivative liabilities | 0 | 0 |
Other liabilities | $ 243 | $ 93 |

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