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FINANCIAL RISK MANAGEMENT - Expected Maturity of Financial Assets and Liablities (Details) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | --- | ---
Disclosure of detailed information about financial instruments [line items] |  |  |
Cash and equivalents | $ 2,234 | $ 2,389 | $ 2,455
Accounts receivable | 239 | 249 |
Liquidity risk |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Cash and equivalents | 2,234 | 2,389 |
Accounts receivable | 239 | 249 |
Derivative assets | 3 | 2 |
Trade and other payables | 1,059 | 1,084 |
Debt | 6,456 | 7,989 |
Derivative liabilities | 32 | 78 |
Other liabilities | 511 | 216 |
Liquidity risk | Less than 1 year |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Cash and equivalents | 2,234 | 2,389 |
Accounts receivable | 239 | 249 |
Derivative assets | 2 | 1 |
Trade and other payables | 1,059 | 1,084 |
Debt | 59 | 143 |
Derivative liabilities | 30 | 51 |
Other liabilities | 30 | 42 |
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 | 1 | 1 |
Trade and other payables | 0 | 0 |
Debt | 311 | 533 |
Derivative liabilities | 2 | 27 |
Other liabilities | 231 | 51 |
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 | 975 | 997 |
Derivative liabilities | 0 | 0 |
Other liabilities | 64 | 3 |
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 | 5,111 | 6,316 |
Derivative liabilities | 0 | 0 |
Other liabilities | $ 186 | $ 120 |

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