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FINANCIAL INSTRUMENTS - Foreign currency exchange rate risk management (Details) - Foreign currency exchange rate risk | 12 Months Ended
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Dec. 31, 2017 USD ($) $ / $
Cash flow hedges | Forward contracts |
Disclosure of detailed information about hedging instruments [line items] |
Notional amount | $ 2,339,000,000
Cross currency swaps | Cash flow hedges | Currency swap contract, term through November 2021 |
Disclosure of detailed information about hedging instruments [line items] |
Amount | 500
Exchange rate (US$/C$) | $ / $ | 1.022
Cross currency swaps | Cash flow hedges | Currency swap contract, term through March 2038 |
Disclosure of detailed information about hedging instruments [line items] |
Amount | 550
Exchange rate (US$/C$) | $ / $ | 1.170
Cross currency swaps | US | Cash flow hedges | Currency swap contract, term through November 2021 |
Disclosure of detailed information about hedging instruments [line items] |
Interest rate | 3.45%
Cross currency swaps | US | Cash flow hedges | Currency swap contract, term through March 2038 |
Disclosure of detailed information about hedging instruments [line items] |
Interest rate | 6.25%
Cross currency swaps | CAD | Cash flow hedges | Currency swap contract, term through November 2021 |
Disclosure of detailed information about hedging instruments [line items] |
Interest rate | 3.96%
Cross currency swaps | CAD | Cash flow hedges | Currency swap contract, term through March 2038 |
Disclosure of detailed information about hedging instruments [line items] |
Interest rate | 5.76%
Forward contracts |
Disclosure of detailed information about hedging instruments [line items] |
Notional amount | $ 3,705,000,000
Derivative, term of contract | 90 days

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