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FINANCIAL RISK MANAGEMENT AND FINANCIAL INSTRUMENTS - Liquidity Risk (Details) - CAD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
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Disclosure Of Maturity Analysis For Derivative And Non-derivative Financial Liabilities [Line Items] |  |  |
Short-term borrowings | $ 2,200 | $ 1,221 |
Accounts payable and accrued liabilities | 3,416 | 2,714 |
Long-term debt | 18,688 | 18,201 | $ 15,967
Lease liabilities | 1,957 | 1,835 | $ 1,725
Expenditure derivatives | Cash flow hedges |  |  |
Disclosure Of Maturity Analysis For Derivative And Non-derivative Financial Liabilities [Line Items] |  |  |
Derivative financial liabilities | 19 |  |
Debt derivatives |  |  |
Disclosure Of Maturity Analysis For Derivative And Non-derivative Financial Liabilities [Line Items] |  |  |
Derivative financial liabilities | (11) | 12 |
Interest rate derivatives |  |  |
Disclosure Of Maturity Analysis For Derivative And Non-derivative Financial Liabilities [Line Items] |  |  |
Derivative financial liabilities | 243 |  |
Interest rate derivatives | Cash flow hedges |  |  |
Disclosure Of Maturity Analysis For Derivative And Non-derivative Financial Liabilities [Line Items] |  |  |
Derivative financial liabilities | 243 |  |
Liquidity risk |  |  |
Disclosure Of Maturity Analysis For Derivative And Non-derivative Financial Liabilities [Line Items] |  |  |
Short-term borrowings | 2,200 | 1,221 |
Short-term borrowings, undiscounted cash flows | 2,200 | 1,221 |
Accounts payable and accrued liabilities | 3,416 | 2,714 |
Accounts payable and accrued liabilities, undiscounted cash flows | 3,416 | 2,714 |
Long-term debt | 18,688 | 18,201 |
Long-term debt, undiscounted cash flows | 18,873 | 18,373 |
Lease liabilities | 1,957 | 1,835 |
Lease liabilities, undiscounted cash flows | 2,498 | 2,353 |
Other long-term financial liabilities | 14 | 22 |
Other long-term financial liabilities, undiscounted cash flows | 14 | 22 |
Net carrying amount of derivatives (asset) | 895 | 1,011 |
Financial liabilities | 25,380 | 22,982 |
Financial liabilities, undiscounted cash flows | 26,813 | 24,183 |
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 | 2,200 | 1,221 |
Accounts payable and accrued liabilities, undiscounted cash flows | 3,416 | 2,714 |
Long-term debt, undiscounted cash flows | 1,551 | 1,450 |
Lease liabilities, undiscounted cash flows | 336 | 278 |
Other long-term financial liabilities, undiscounted cash flows | 0 | 0 |
Financial liabilities, undiscounted cash flows | 7,935 | 5,729 |
Net interest payments | 804 | 747 |
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 | 2,312 | 3,274 |
Lease liabilities, undiscounted cash flows | 677 | 647 |
Other long-term financial liabilities, undiscounted cash flows | 7 | 14 |
Financial liabilities, undiscounted cash flows | 2,675 | 3,706 |
Net interest payments | 1,444 | 1,322 |
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 | 3,520 | 1,490 |
Lease liabilities, undiscounted cash flows | 308 | 300 |
Other long-term financial liabilities, undiscounted cash flows | 2 | 2 |
Financial liabilities, undiscounted cash flows | 3,916 | 1,838 |
Net interest payments | 1,321 | 1,167 |
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 | 11,490 | 12,159 |
Lease liabilities, undiscounted cash flows | 1,177 | 1,128 |
Other long-term financial liabilities, undiscounted cash flows | 5 | 6 |
Financial liabilities, undiscounted cash flows | 12,287 | 12,910 |
Net interest payments | 7,789 | 8,331 |
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 | 1,374 | 2,134 |
Net carrying amount of derivatives (asset) | 1,354 | 2,024 |
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 | 1,240 | 1,305 |
Net carrying amount of derivatives (asset) | 1,217 | 1,222 |
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 | 134 | 829 |
Net carrying amount of derivatives (asset) | 137 | 802 |
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 | (36) | (34) |
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 | (36) | (34) |
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 | 1,390 | 585 |
Net carrying amount of derivatives (asset) | 1,401 | 573 |
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 | 1,390 | 585 |
Net carrying amount of derivatives (asset) | 1,401 | 573 |
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 | 11,313 | 11,114 |
Net carrying amount of derivatives (asset) | 11,717 | 11,702 |
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 | 1,297 | 86 |
Net carrying amount of derivatives (asset) | 1,084 | 81 |
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 | 1,504 | 2,516 |
Net carrying amount of derivatives (asset) | 1,822 | 2,772 |
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 | 1,607 | 937 |
Net carrying amount of derivatives (asset) | 1,521 | 891 |
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 | 6,905 | 7,575 |
Net carrying amount of derivatives (asset) | 7,290 | $ 7,958 |
Liquidity risk | Interest rate derivatives |  |  |
Disclosure Of Maturity Analysis For Derivative And Non-derivative Financial Liabilities [Line Items] |  |  |
Derivative financial liabilities | 0 |  |
Net carrying amount of derivatives (asset) | 243 |  |
Liquidity risk | Interest rate derivatives | Less than 1 year |  |  |
Disclosure Of Maturity Analysis For Derivative And Non-derivative Financial Liabilities [Line Items] |  |  |
Net carrying amount of derivatives (asset) | 243 |  |
Liquidity risk | Interest rate derivatives | 1-3 Years |  |  |
Disclosure Of Maturity Analysis For Derivative And Non-derivative Financial Liabilities [Line Items] |  |  |
Net carrying amount of derivatives (asset) | 0 |  |
Liquidity risk | Interest rate derivatives | 4-5 years |  |  |
Disclosure Of Maturity Analysis For Derivative And Non-derivative Financial Liabilities [Line Items] |  |  |
Net carrying amount of derivatives (asset) | 0 |  |
Liquidity risk | Interest rate derivatives | After 5 years |  |  |
Disclosure Of Maturity Analysis For Derivative And Non-derivative Financial Liabilities [Line Items] |  |  |
Net carrying amount of derivatives (asset) | $ 0 |  |

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