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FINANCIAL RISK MANAGEMENT AND FINANCIAL INSTRUMENTS - Liquidity Risk (Details) - CAD CAD in Millions | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | --- | ---
Disclosure Of Maturity Analysis For Derivative And Non-derivative Financial Liabilities [Line Items] |  |  |
Bank advances | CAD 6 | CAD 71 |
Short-term borrowings | 1,585 | 800 |
Accounts payable and accrued liabilities | 2,931 | 2,783 |
Long-term debt | 14,448 | 16,080 | CAD 16,870
Less than 1 year |  |  |
Disclosure Of Maturity Analysis For Derivative And Non-derivative Financial Liabilities [Line Items] |  |  |
Interest payable | 712 | 727 |
1-3 Years |  |  |
Disclosure Of Maturity Analysis For Derivative And Non-derivative Financial Liabilities [Line Items] |  |  |
Interest payable | 1,160 | 1,294 |
4-5 years |  |  |
Disclosure Of Maturity Analysis For Derivative And Non-derivative Financial Liabilities [Line Items] |  |  |
Interest payable | 908 | 1,033 |
After five years |  |  |
Disclosure Of Maturity Analysis For Derivative And Non-derivative Financial Liabilities [Line Items] |  |  |
Interest payable | 5,409 | 5,832 |
Expenditure derivatives | Cash flow hedges |  |  |
Disclosure Of Maturity Analysis For Derivative And Non-derivative Financial Liabilities [Line Items] |  |  |
Derivative financial liabilities | 39 |  |
Derivative financial liabilities | 44 | 21 |
Debt derivatives |  |  |
Disclosure Of Maturity Analysis For Derivative And Non-derivative Financial Liabilities [Line Items] |  |  |
Derivative financial liabilities | 23 | 0 | 0
Derivative financial liabilities | 23 | 0 |
Debt derivatives | Cash flow hedges |  |  |
Disclosure Of Maturity Analysis For Derivative And Non-derivative Financial Liabilities [Line Items] |  |  |
Derivative financial liabilities | 149 | 68 |
Bond forward | Cash flow hedges |  |  |
Disclosure Of Maturity Analysis For Derivative And Non-derivative Financial Liabilities [Line Items] |  |  |
Derivative financial liabilities | 64 | 51 | CAD 91
Derivative financial liabilities | 64 | 51 |
Liquidity risk |  |  |
Disclosure Of Maturity Analysis For Derivative And Non-derivative Financial Liabilities [Line Items] |  |  |
Bank advances | 6 | 71 |
Bank borrowings, undiscounted cash flows | 6 | 71 |
Short-term borrowings | 1,585 | 800 |
Short-term borrowings, undiscounted cash flows | 1,585 | 800 |
Accounts payable and accrued liabilities | 2,931 | 2,783 |
Accounts payable and accrued liabilities, undiscounted cash flows | 2,931 | 2,783 |
Long-term debt, undiscounted cash flows | 14,555 | 16,197 |
Other long-term financial liabilities | 9 | 18 |
Other long-term debt, undiscounted cash flows | 9 | 18 |
Net carrying amount of derivatives (asset) | (1,094) | (1,659) |
Financial liabilities | 17,885 | 18,093 |
Financial liabilities, undiscounted cash flows | 18,148 | 18,309 |
Liquidity risk | Less than 1 year |  |  |
Disclosure Of Maturity Analysis For Derivative And Non-derivative Financial Liabilities [Line Items] |  |  |
Bank borrowings, undiscounted cash flows | 6 | 71 |
Short-term borrowings, undiscounted cash flows | 1,585 | 800 |
Accounts payable and accrued liabilities, undiscounted cash flows | 2,931 | 2,783 |
Long-term debt, undiscounted cash flows | 1,756 | 750 |
Other long-term debt, undiscounted cash flows | 2 | 0 |
Financial liabilities | 6,016 |  |
Financial liabilities, undiscounted cash flows |  | 4,387 |
Liquidity risk | 1-3 Years |  |  |
Disclosure Of Maturity Analysis For Derivative And Non-derivative Financial Liabilities [Line Items] |  |  |
Bank borrowings, undiscounted cash flows | 0 | 0 |
Short-term borrowings, undiscounted cash flows | 0 | 0 |
Accounts payable and accrued liabilities, undiscounted cash flows | 0 | 0 |
Long-term debt, undiscounted cash flows | 1,800 | 3,081 |
Other long-term debt, undiscounted cash flows | 3 | 12 |
Financial liabilities | 1,796 |  |
Financial liabilities, undiscounted cash flows |  | 2,684 |
Liquidity risk | 4-5 years |  |  |
Disclosure Of Maturity Analysis For Derivative And Non-derivative Financial Liabilities [Line Items] |  |  |
Bank borrowings, undiscounted cash flows | 0 | 0 |
Short-term borrowings, undiscounted cash flows | 0 | 0 |
Accounts payable and accrued liabilities, undiscounted cash flows | 0 | 0 |
Long-term debt, undiscounted cash flows | 2,050 | 2,350 |
Other long-term debt, undiscounted cash flows | 2 | 3 |
Financial liabilities | 2,052 |  |
Financial liabilities, undiscounted cash flows |  | 2,353 |
Liquidity risk | After five years |  |  |
Disclosure Of Maturity Analysis For Derivative And Non-derivative Financial Liabilities [Line Items] |  |  |
Bank borrowings, undiscounted cash flows | 0 | 0 |
Short-term borrowings, undiscounted cash flows | 0 | 0 |
Accounts payable and accrued liabilities, undiscounted cash flows | 0 | 0 |
Long-term debt, undiscounted cash flows | 8,949 | 10,016 |
Other long-term debt, undiscounted cash flows | 2 | 3 |
Financial liabilities | 8,284 |  |
Financial liabilities, undiscounted cash flows |  | 8,885 |
Liquidity risk | Expenditure derivatives |  |  |
Disclosure Of Maturity Analysis For Derivative And Non-derivative Financial Liabilities [Line Items] |  |  |
Derivative financial liabilities | 0 | 0 |
Derivative financial liabilities | 1,538 | 1,708 |
Net carrying amount of derivatives (asset) | (1,506) | (1,732) |
Liquidity risk | Expenditure derivatives | Less than 1 year |  |  |
Disclosure Of Maturity Analysis For Derivative And Non-derivative Financial Liabilities [Line Items] |  |  |
Derivative financial liabilities | 1,093 | 1,240 |
Net carrying amount of derivatives (asset) | (1,054) | (1,249) |
Liquidity risk | Expenditure derivatives | 1-3 Years |  |  |
Disclosure Of Maturity Analysis For Derivative And Non-derivative Financial Liabilities [Line Items] |  |  |
Derivative financial liabilities | 445 | 468 |
Net carrying amount of derivatives (asset) | (452) | (483) |
Liquidity risk | Expenditure derivatives | 4-5 years |  |  |
Disclosure Of Maturity Analysis For Derivative And Non-derivative Financial Liabilities [Line Items] |  |  |
Derivative financial liabilities | 0 | 0 |
Net carrying amount of derivatives (asset) | 0 | 0 |
Liquidity risk | Expenditure derivatives | After five years |  |  |
Disclosure Of Maturity Analysis For Derivative And Non-derivative Financial Liabilities [Line Items] |  |  |
Derivative financial liabilities | 0 | 0 |
Net carrying amount of derivatives (asset) | 0 | 0 |
Liquidity risk | Equity derivatives |  |  |
Disclosure Of Maturity Analysis For Derivative And Non-derivative Financial Liabilities [Line Items] |  |  |
Derivative financial liabilities | 0 | 0 |
Derivative financial liabilities | (68) | (8) |
Liquidity risk | Equity derivatives | Less than 1 year |  |  |
Disclosure Of Maturity Analysis For Derivative And Non-derivative Financial Liabilities [Line Items] |  |  |
Derivative financial liabilities | (68) | (8) |
Liquidity risk | Equity derivatives | 1-3 Years |  |  |
Disclosure Of Maturity Analysis For Derivative And Non-derivative Financial Liabilities [Line Items] |  |  |
Derivative financial liabilities | 0 | 0 |
Liquidity risk | Equity derivatives | 4-5 years |  |  |
Disclosure Of Maturity Analysis For Derivative And Non-derivative Financial Liabilities [Line Items] |  |  |
Derivative financial liabilities | 0 | 0 |
Liquidity risk | Equity derivatives | After five years |  |  |
Disclosure Of Maturity Analysis For Derivative And Non-derivative Financial Liabilities [Line Items] |  |  |
Derivative financial liabilities | 0 | 0 |
Liquidity risk | Debt derivatives |  |  |
Disclosure Of Maturity Analysis For Derivative And Non-derivative Financial Liabilities [Line Items] |  |  |
Derivative financial liabilities | 0 | 0 |
Derivative financial liabilities | 956 | 201 |
Net carrying amount of derivatives (asset) | (934) | (201) |
Liquidity risk | Debt derivatives | Less than 1 year |  |  |
Disclosure Of Maturity Analysis For Derivative And Non-derivative Financial Liabilities [Line Items] |  |  |
Derivative financial liabilities | 956 | 201 |
Net carrying amount of derivatives (asset) | (934) | (201) |
Liquidity risk | Debt derivatives | 1-3 Years |  |  |
Disclosure Of Maturity Analysis For Derivative And Non-derivative Financial Liabilities [Line Items] |  |  |
Derivative financial liabilities | 0 | 0 |
Net carrying amount of derivatives (asset) | 0 | 0 |
Liquidity risk | Debt derivatives | 4-5 years |  |  |
Disclosure Of Maturity Analysis For Derivative And Non-derivative Financial Liabilities [Line Items] |  |  |
Derivative financial liabilities | 0 | 0 |
Net carrying amount of derivatives (asset) | 0 | 0 |
Liquidity risk | Debt derivatives | After five years |  |  |
Disclosure Of Maturity Analysis For Derivative And Non-derivative Financial Liabilities [Line Items] |  |  |
Derivative financial liabilities | 0 | 0 |
Net carrying amount of derivatives (asset) | 0 | 0 |
Liquidity risk | Debt derivatives | Cash flow hedges |  |  |
Disclosure Of Maturity Analysis For Derivative And Non-derivative Financial Liabilities [Line Items] |  |  |
Derivative financial liabilities | 0 | 0 |
Derivative financial liabilities | 7,417 | 7,417 |
Net carrying amount of derivatives (asset) | (8,405) | (8,996) |
Liquidity risk | Debt derivatives | Cash flow hedges | Less than 1 year |  |  |
Disclosure Of Maturity Analysis For Derivative And Non-derivative Financial Liabilities [Line Items] |  |  |
Derivative financial liabilities | 1,435 | 0 |
Net carrying amount of derivatives (asset) | (1,756) | 0 |
Liquidity risk | Debt derivatives | Cash flow hedges | 1-3 Years |  |  |
Disclosure Of Maturity Analysis For Derivative And Non-derivative Financial Liabilities [Line Items] |  |  |
Derivative financial liabilities | 0 | 1,435 |
Net carrying amount of derivatives (asset) | 0 | (1,880) |
Liquidity risk | Debt derivatives | Cash flow hedges | 4-5 years |  |  |
Disclosure Of Maturity Analysis For Derivative And Non-derivative Financial Liabilities [Line Items] |  |  |
Derivative financial liabilities | 0 | 0 |
Net carrying amount of derivatives (asset) | 0 | 0 |
Liquidity risk | Debt derivatives | Cash flow hedges | After five years |  |  |
Disclosure Of Maturity Analysis For Derivative And Non-derivative Financial Liabilities [Line Items] |  |  |
Derivative financial liabilities | 5,982 | 5,982 |
Net carrying amount of derivatives (asset) | (6,649) | (7,116) |
Liquidity risk | Bond forward |  |  |
Disclosure Of Maturity Analysis For Derivative And Non-derivative Financial Liabilities [Line Items] |  |  |
Derivative financial liabilities | 0 | 0 |
Derivative financial liabilities | 64 | 51 |
Liquidity risk | Bond forward | Less than 1 year |  |  |
Disclosure Of Maturity Analysis For Derivative And Non-derivative Financial Liabilities [Line Items] |  |  |
Derivative financial liabilities |  | 0 |
Liquidity risk | Bond forward | 1-3 Years |  |  |
Disclosure Of Maturity Analysis For Derivative And Non-derivative Financial Liabilities [Line Items] |  |  |
Derivative financial liabilities | 0 |  |
Liquidity risk | Bond forward | 4-5 years |  |  |
Disclosure Of Maturity Analysis For Derivative And Non-derivative Financial Liabilities [Line Items] |  |  |
Derivative financial liabilities | 0 | 0 |
Liquidity risk | Bond forward | After five years |  |  |
Disclosure Of Maturity Analysis For Derivative And Non-derivative Financial Liabilities [Line Items] |  |  |
Derivative financial liabilities | CAD 0 | CAD 0 |

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