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FINANCIAL RISK MANAGEMENT AND FINANCIAL INSTRUMENTS - Liquidity Risk (Details) - CAD ($) | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
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Disclosure Of Maturity Analysis For Derivative And Non-derivative Financial Liabilities [Line Items] |  |  |
Short-term borrowings | $ 1,221,000,000 | $ 2,238,000,000 |
Accounts payable and accrued liabilities | 2,714,000,000 | 3,033,000,000 |
Long-term debt | 18,201,000,000 | 15,967,000,000 | $ 14,290,000,000
Lease liabilities | 1,835,000,000 | 1,725,000,000 | 1,545,000,000
Expenditure derivatives | Cash flow hedges |  |  |
Disclosure Of Maturity Analysis For Derivative And Non-derivative Financial Liabilities [Line Items] |  |  |
Derivative financial liabilities | 109,000,000 |  |
Debt derivatives |  |  |
Disclosure Of Maturity Analysis For Derivative And Non-derivative Financial Liabilities [Line Items] |  |  |
Derivative financial liabilities | 12,000,000 | 29,000,000 |
Bond forwards | Cash flow hedges |  |  |
Disclosure Of Maturity Analysis For Derivative And Non-derivative Financial Liabilities [Line Items] |  |  |
Derivative financial liabilities | 0 | 0 | $ 87,000,000
Liquidity risk |  |  |
Disclosure Of Maturity Analysis For Derivative And Non-derivative Financial Liabilities [Line Items] |  |  |
Short-term borrowings | 1,221,000,000 | 2,238,000,000 |
Short-term borrowings, undiscounted cash flows | 1,221,000,000 | 2,238,000,000 |
Accounts payable and accrued liabilities | 2,714,000,000 | 3,033,000,000 |
Accounts payable and accrued liabilities, undiscounted cash flows | 2,714,000,000 | 3,033,000,000 |
Long-term debt | 18,201,000,000 | 15,967,000,000 |
Long-term debt, undiscounted cash flows | 18,373,000,000 | 16,130,000,000 |
Lease liabilities | 1,835,000,000 | 1,725,000,000 |
Lease liabilities, undiscounted cash flows | 2,353,000,000 | 2,220,000,000 |
Other long-term financial liabilities | 22,000,000 | 26,000,000 |
Other long-term financial liabilities, undiscounted cash flows | 22,000,000 | 26,000,000 |
Net carrying amount of derivatives (asset) | (1,011,000,000) | (1,439,000,000) |
Financial liabilities | 22,982,000,000 | 21,550,000,000 |
Financial liabilities, undiscounted cash flows | 24,183,000,000 | 22,745,000,000 |
Liquidity risk | Less than 1 year |  |  |
Disclosure Of Maturity Analysis For Derivative And Non-derivative Financial Liabilities [Line Items] |  |  |
Short-term borrowings, undiscounted cash flows | 1,221,000,000 | 2,238,000,000 |
Accounts payable and accrued liabilities, undiscounted cash flows | 2,714,000,000 | 3,033,000,000 |
Long-term debt, undiscounted cash flows | 1,450,000,000 | 0 |
Lease liabilities, undiscounted cash flows | 278,000,000 | 230,000,000 |
Other long-term financial liabilities, undiscounted cash flows | 0 | 0 |
Financial liabilities, undiscounted cash flows | 5,729,000,000 | 5,476,000,000 |
Net interest payments | 747,000,000 | 735,000,000 |
Liquidity risk | 1-3 Years |  |  |
Disclosure Of Maturity Analysis For Derivative And Non-derivative Financial Liabilities [Line Items] |  |  |
Short-term borrowings, undiscounted cash flows | 0 | 0 |
Accounts payable and accrued liabilities, undiscounted cash flows | 0 | 0 |
Long-term debt, undiscounted cash flows | 3,274,000,000 | 2,050,000,000 |
Lease liabilities, undiscounted cash flows | 647,000,000 | 413,000,000 |
Other long-term financial liabilities, undiscounted cash flows | 14,000,000 | 12,000,000 |
Financial liabilities, undiscounted cash flows | 3,706,000,000 | 2,475,000,000 |
Net interest payments | 1,322,000,000 | 1,299,000,000 |
Liquidity risk | 4-5 years |  |  |
Disclosure Of Maturity Analysis For Derivative And Non-derivative Financial Liabilities [Line Items] |  |  |
Short-term borrowings, undiscounted cash flows | 0 | 0 |
Accounts payable and accrued liabilities, undiscounted cash flows | 0 | 0 |
Long-term debt, undiscounted cash flows | 1,490,000,000 | 2,353,000,000 |
Lease liabilities, undiscounted cash flows | 300,000,000 | 326,000,000 |
Other long-term financial liabilities, undiscounted cash flows | 2,000,000 | 7,000,000 |
Financial liabilities, undiscounted cash flows | 1,838,000,000 | 2,325,000,000 |
Net interest payments | 1,167,000,000 | 1,121,000,000 |
Liquidity risk | After 5 years |  |  |
Disclosure Of Maturity Analysis For Derivative And Non-derivative Financial Liabilities [Line Items] |  |  |
Short-term borrowings, undiscounted cash flows | 0 | 0 |
Accounts payable and accrued liabilities, undiscounted cash flows | 0 | 0 |
Long-term debt, undiscounted cash flows | 12,159,000,000 | 11,727,000,000 |
Lease liabilities, undiscounted cash flows | 1,128,000,000 | 1,251,000,000 |
Other long-term financial liabilities, undiscounted cash flows | 6,000,000 | 7,000,000 |
Financial liabilities, undiscounted cash flows | 12,910,000,000 | 12,469,000,000 |
Net interest payments | 8,331,000,000 | 8,763,000,000 |
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, undiscounted cash flows | 2,134,000,000 | 1,287,000,000 |
Net carrying amount of derivatives (asset) | (2,024,000,000) | (1,286,000,000) |
Liquidity risk | Expenditure derivatives | Less than 1 year |  |  |
Disclosure Of Maturity Analysis For Derivative And Non-derivative Financial Liabilities [Line Items] |  |  |
Derivative financial liabilities, undiscounted cash flows | 1,305,000,000 | 1,248,000,000 |
Net carrying amount of derivatives (asset) | (1,222,000,000) | (1,247,000,000) |
Liquidity risk | Expenditure derivatives | 1-3 Years |  |  |
Disclosure Of Maturity Analysis For Derivative And Non-derivative Financial Liabilities [Line Items] |  |  |
Derivative financial liabilities, undiscounted cash flows | 829,000,000 | 39,000,000 |
Net carrying amount of derivatives (asset) | (802,000,000) | (39,000,000) |
Liquidity risk | Expenditure derivatives | 4-5 years |  |  |
Disclosure Of Maturity Analysis For Derivative And Non-derivative Financial Liabilities [Line Items] |  |  |
Derivative financial liabilities, undiscounted cash flows | 0 | 0 |
Net carrying amount of derivatives (asset) | 0 | 0 |
Liquidity risk | Expenditure derivatives | After 5 years |  |  |
Disclosure Of Maturity Analysis For Derivative And Non-derivative Financial Liabilities [Line Items] |  |  |
Derivative financial liabilities, undiscounted cash flows | 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, undiscounted cash flows | (34,000,000) | (55,000,000) |
Liquidity risk | Equity derivatives | Less than 1 year |  |  |
Disclosure Of Maturity Analysis For Derivative And Non-derivative Financial Liabilities [Line Items] |  |  |
Derivative financial liabilities, undiscounted cash flows | (34,000,000) | (55,000,000) |
Liquidity risk | Equity derivatives | 1-3 Years |  |  |
Disclosure Of Maturity Analysis For Derivative And Non-derivative Financial Liabilities [Line Items] |  |  |
Derivative financial liabilities, undiscounted cash flows | 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, undiscounted cash flows | 0 | 0 |
Liquidity risk | Equity derivatives | After 5 years |  |  |
Disclosure Of Maturity Analysis For Derivative And Non-derivative Financial Liabilities [Line Items] |  |  |
Derivative financial liabilities, undiscounted cash flows | 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, undiscounted cash flows | 585,000,000 | 1,622,000,000 |
Net carrying amount of derivatives (asset) | (573,000,000) | (1,593,000,000) |
Liquidity risk | Debt derivatives | Less than 1 year |  |  |
Disclosure Of Maturity Analysis For Derivative And Non-derivative Financial Liabilities [Line Items] |  |  |
Derivative financial liabilities, undiscounted cash flows | 585,000,000 | 1,622,000,000 |
Net carrying amount of derivatives (asset) | (573,000,000) | (1,593,000,000) |
Liquidity risk | Debt derivatives | 1-3 Years |  |  |
Disclosure Of Maturity Analysis For Derivative And Non-derivative Financial Liabilities [Line Items] |  |  |
Derivative financial liabilities, undiscounted cash flows | 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, undiscounted cash flows | 0 | 0 |
Net carrying amount of derivatives (asset) | 0 | 0 |
Liquidity risk | Debt derivatives | After 5 years |  |  |
Disclosure Of Maturity Analysis For Derivative And Non-derivative Financial Liabilities [Line Items] |  |  |
Derivative financial liabilities, undiscounted cash flows | 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, undiscounted cash flows | 11,114,000,000 | 9,903,000,000 |
Net carrying amount of derivatives (asset) | (11,702,000,000) | (10,780,000,000) |
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, undiscounted cash flows | 86,000,000 | 0 |
Net carrying amount of derivatives (asset) | (81,000,000) | 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, undiscounted cash flows | 2,516,000,000 | 0 |
Net carrying amount of derivatives (asset) | (2,772,000,000) | 0 |
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, undiscounted cash flows | 937,000,000 | 1,392,000,000 |
Net carrying amount of derivatives (asset) | (891,000,000) | (1,753,000,000) |
Liquidity risk | Debt derivatives | Cash flow hedges | After 5 years |  |  |
Disclosure Of Maturity Analysis For Derivative And Non-derivative Financial Liabilities [Line Items] |  |  |
Derivative financial liabilities, undiscounted cash flows | 7,575,000,000 | 8,511,000,000 |
Net carrying amount of derivatives (asset) | $ (7,958,000,000) | (9,027,000,000) |
Liquidity risk | Bond forwards |  |  |
Disclosure Of Maturity Analysis For Derivative And Non-derivative Financial Liabilities [Line Items] |  |  |
Derivative financial liabilities |  | 0 |
Derivative financial liabilities, undiscounted cash flows |  | 0 |
Liquidity risk | Bond forwards | Less than 1 year |  |  |
Disclosure Of Maturity Analysis For Derivative And Non-derivative Financial Liabilities [Line Items] |  |  |
Derivative financial liabilities, undiscounted cash flows |  | 0 |
Liquidity risk | Bond forwards | 1-3 Years |  |  |
Disclosure Of Maturity Analysis For Derivative And Non-derivative Financial Liabilities [Line Items] |  |  |
Derivative financial liabilities, undiscounted cash flows |  | 0 |
Liquidity risk | Bond forwards | 4-5 years |  |  |
Disclosure Of Maturity Analysis For Derivative And Non-derivative Financial Liabilities [Line Items] |  |  |
Derivative financial liabilities, undiscounted cash flows |  | 0 |
Liquidity risk | Bond forwards | After 5 years |  |  |
Disclosure Of Maturity Analysis For Derivative And Non-derivative Financial Liabilities [Line Items] |  |  |
Derivative financial liabilities, undiscounted cash flows |  | $ 0 |

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