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FINANCIAL RISK MANAGEMENT AND FINANCIAL INSTRUMENTS - Changes in Fair Value of Derivatives (Details) - CAD ($) | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Disclosure of detailed information about financial instruments [line items] |  |
Derivative financial assets, beginning of year | $ 1,439,000,000 | $ 1,500,000,000
Proceeds received from settlement of derivatives | (8,166,000,000) | (18,829,000,000)
Payment on derivatives settled | 8,047,000,000 | 18,865,000,000
Increase (decrease) in fair value of derivatives | (309,000,000) | (97,000,000)
Derivative financial assets, end of year | 1,011,000,000 | 1,439,000,000
Debt derivatives |  |
Disclosure of detailed information about financial instruments [line items] |  |
Derivative financial assets, beginning of year | 1,383,000,000 |
Derivative financial liabilities, beginning of year | (29,000,000) |
Proceeds received from settlement of derivatives | (6,906,000,000) | (17,620,000,000)
Payment on derivatives settled | 6,826,000,000 | 17,630,000,000
Increase (decrease) in fair value of derivatives | 97,000,000 | (80,000,000)
Derivative financial assets, end of year | 1,086,000,000 | 1,383,000,000
Derivative financial liabilities, end of year | (12,000,000) | (29,000,000)
Equity derivatives |  |
Disclosure of detailed information about financial instruments [line items] |  |
Derivative financial assets, beginning of year | 55,000,000 | 92,000,000
Proceeds received from settlement of derivatives | 1,000,000 | (15,000,000)
Payment on derivatives settled | 0 | 0
Increase (decrease) in fair value of derivatives | (22,000,000) | (22,000,000)
Derivative financial assets, end of year | 34,000,000 | 55,000,000
Cash flow hedges | Debt derivatives |  |
Disclosure of detailed information about financial instruments [line items] |  |
Derivative financial assets, beginning of year | 1,412,000,000 | 1,332,000,000
Proceeds received from settlement of derivatives | 0 | 0
Payment on derivatives settled | 0 | 0
Increase (decrease) in fair value of derivatives | (314,000,000) | 80,000,000
Derivative financial assets, end of year | 1,098,000,000 | 1,412,000,000
Cash flow hedges | Bond forwards |  |
Disclosure of detailed information about financial instruments [line items] |  |
Derivative financial liabilities, beginning of year | 0 | (87,000,000)
Proceeds received from settlement of derivatives |  | 0
Payment on derivatives settled |  | 111,000,000
Increase (decrease) in fair value of derivatives |  | (24,000,000)
Derivative financial liabilities, end of year | 0 | 0
Cash flow hedges | Expenditure derivatives |  |
Disclosure of detailed information about financial instruments [line items] |  |
Derivative financial assets, beginning of year | 1,000,000 | 122,000,000
Proceeds received from settlement of derivatives | (1,261,000,000) | (1,194,000,000)
Payment on derivatives settled | 1,221,000,000 | 1,124,000,000
Increase (decrease) in fair value of derivatives | (70,000,000) | (51,000,000)
Derivative financial assets, end of year |  | 1,000,000
Derivative financial liabilities, end of year | (109,000,000) |
Before Offset Amount |  |
Disclosure of detailed information about financial instruments [line items] |  |
Derivative financial assets, beginning of year | 1,579,000,000 |
Derivative financial liabilities, beginning of year | (140,000,000) |
Derivative financial assets, end of year | 1,439,000,000 | 1,579,000,000
Derivative financial liabilities, end of year | (428,000,000) | (140,000,000)
Before Offset Amount | Debt derivatives |  |
Disclosure of detailed information about financial instruments [line items] |  |
Derivative financial assets, beginning of year | 0 | 41,000,000
Derivative financial liabilities, beginning of year | (29,000,000) |
Derivative financial assets, end of year | 0 | 0
Derivative financial liabilities, end of year | (12,000,000) | (29,000,000)
Before Offset Amount | Bond forwards |  |
Disclosure of detailed information about financial instruments [line items] |  |
Derivative financial assets, beginning of year | 0 |
Derivative financial assets, end of year |  | 0
Before Offset Amount | Equity derivatives |  |
Disclosure of detailed information about financial instruments [line items] |  |
Derivative financial assets, beginning of year | 55,000,000 |
Derivative financial liabilities, beginning of year | 0 |
Derivative financial assets, end of year | 34,000,000 | 55,000,000
Derivative financial liabilities, end of year | 0 | 0
Before Offset Amount | Cash flow hedges | Debt derivatives |  |
Disclosure of detailed information about financial instruments [line items] |  |
Derivative financial assets, beginning of year | 1,508,000,000 |
Derivative financial liabilities, beginning of year | (96,000,000) |
Derivative financial assets, end of year | 1,405,000,000 | 1,508,000,000
Derivative financial liabilities, end of year | (307,000,000) | (96,000,000)
Before Offset Amount | Cash flow hedges | Bond forwards |  |
Disclosure of detailed information about financial instruments [line items] |  |
Derivative financial liabilities, beginning of year | 0 |
Derivative financial liabilities, end of year |  | 0
Before Offset Amount | Cash flow hedges | Expenditure derivatives |  |
Disclosure of detailed information about financial instruments [line items] |  |
Derivative financial assets, beginning of year | 16,000,000 |
Derivative financial liabilities, beginning of year | (15,000,000) |
Derivative financial assets, end of year | 0 | 16,000,000
Derivative financial liabilities, end of year | $ (109,000,000) | $ (15,000,000)

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