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FINANCIAL RISK MANAGEMENT AND FINANCIAL INSTRUMENTS - Changes in Fair Value of Derivatives (Details) $ in Millions, $ in Millions | 12 Months Ended
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Dec. 31, 2021 CAD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 CAD ($)
Disclosure of detailed information about financial instruments [line items] |  |  |
Derivative financial assets, beginning of year | $ 1,011 |  | $ 1,439
Proceeds received from settlement of derivatives | (5,127) |  | (8,166)
Payment on derivatives settled | 5,236 |  | 8,047
(Decrease) increase in fair value of derivatives | (225) |  | (309)
Derivative financial assets, end of year | 895 |  | 1,011
Debt derivatives |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Derivative financial assets, beginning of year | 1,086 |  |
Derivative financial liabilities, beginning of year | (12) |  |
Proceeds received from settlement of derivatives | (3,914) |  | (6,906)
Payment on derivatives settled | 3,931 |  | 6,826
(Decrease) increase in fair value of derivatives | 6 |  | 97
Derivative financial assets, end of year | 1,121 |  | 1,086
Derivative financial liabilities, end of year | 11 |  | (12)
Interest rate derivatives |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Derivative financial liabilities, end of year | (243) |  |
Equity derivatives |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Derivative financial assets, beginning of year | 34 |  | 55
Proceeds received from settlement of derivatives | (3) |  | 1
Payment on derivatives settled | 0 |  | 0
(Decrease) increase in fair value of derivatives | 5 |  | (22)
Derivative financial assets, end of year | 36 |  | 34
Cash flow hedges | Debt derivatives |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Derivative financial assets, beginning of year | 1,098 |  | 1,412
Proceeds received from settlement of derivatives | 0 |  | 0
Payment on derivatives settled | 0 |  | 0
(Decrease) increase in fair value of derivatives | 12 |  | (314)
Derivative financial assets, end of year | 1,110 |  | 1,098
Cash flow hedges | Interest rate derivatives |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Proceeds received from settlement of derivatives | (9) |  |
Payment on derivatives settled | 0 |  |
(Decrease) increase in fair value of derivatives | (234) |  |
Derivative financial liabilities, end of year | (243) |  |
Cash flow hedges | Expenditure derivatives |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Derivative financial assets, beginning of year | (109) |  | 1
Proceeds received from settlement of derivatives | (1,201) |  | (1,261)
Payment on derivatives settled | 1,305 |  | 1,221
(Decrease) increase in fair value of derivatives | (14) |  | (70)
Derivative financial assets, end of year |  |  | (109)
Derivative financial liabilities, end of year | (19) |  |
Before Offset Amount |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Derivative financial assets, beginning of year | 1,439 |  |
Derivative financial liabilities, beginning of year | (428) |  |
Derivative financial assets, end of year | 1,551 |  | 1,439
Derivative financial liabilities, end of year | (656) |  | (428)
Before Offset Amount | Debt derivatives |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Derivative financial assets, beginning of year | 0 |  | (29)
Derivative financial liabilities, beginning of year | (12) |  |
Derivative financial assets, end of year | (11) |  | 0
Derivative financial liabilities, end of year | 0 |  | (12)
Before Offset Amount | Interest rate derivatives |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Derivative financial liabilities, end of year | (283) |  |
Before Offset Amount | Equity derivatives |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Derivative financial assets, beginning of year | 34 |  |
Derivative financial liabilities, beginning of year | 0 |  |
Derivative financial assets, end of year | 36 |  | 34
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 | 1,405 |  |
Derivative financial liabilities, beginning of year | (307) |  |
Derivative financial assets, end of year | 1,453 |  | 1,405
Derivative financial liabilities, end of year | (343) |  | (307)
Before Offset Amount | Cash flow hedges | Interest rate derivatives |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Derivative financial assets, beginning of year | 0 |  |
Derivative financial liabilities, beginning of year | 0 |  |
Derivative financial assets, end of year | 40 |  | 0
Derivative financial liabilities, end of year | (6) | $ (277) | 0
Before Offset Amount | Cash flow hedges | Expenditure derivatives |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Derivative financial assets, beginning of year | 0 |  |
Derivative financial liabilities, beginning of year | (109) |  |
Derivative financial assets, end of year | 11 |  | 0
Derivative financial liabilities, end of year | $ (30) |  | $ (109)

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