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FINANCIAL RISK MANAGEMENT AND FINANCIAL INSTRUMENTS - Liquidity Risk (Details) - CAD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
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Disclosure Of Maturity Analysis For Derivative And Non-derivative Financial Liabilities [Line Items] |  |  |
Short-term borrowings | $ 2,985 | $ 2,200 |
Accounts payable and accrued liabilities | 3,722 | 3,416 |
Long-term debt | 31,733 | 18,688 | $ 18,201
Lease liabilities | 2,028 | 1,957 | 1,835
Expenditure derivatives | Cash flow hedges |  |  |
Disclosure Of Maturity Analysis For Derivative And Non-derivative Financial Liabilities [Line Items] |  |  |
Derivative financial liabilities | (94) | (19) |
Debt derivatives |  |  |
Disclosure Of Maturity Analysis For Derivative And Non-derivative Financial Liabilities [Line Items] |  |  |
Derivative financial liabilities | (72) | (11) |
Interest rate derivatives |  |  |
Disclosure Of Maturity Analysis For Derivative And Non-derivative Financial Liabilities [Line Items] |  |  |
Derivative financial liabilities | 0 | 243 |
Interest rate derivatives | Cash flow hedges |  |  |
Disclosure Of Maturity Analysis For Derivative And Non-derivative Financial Liabilities [Line Items] |  |  |
Derivative financial liabilities | 0 | 243 | $ 0
Liquidity risk |  |  |
Disclosure Of Maturity Analysis For Derivative And Non-derivative Financial Liabilities [Line Items] |  |  |
Short-term borrowings | 2,985 | 2,200 |
Short-term borrowings, undiscounted cash flows | 2,985 | 2,200 |
Accounts payable and accrued liabilities | 3,722 | 3,416 |
Accounts payable and accrued liabilities, undiscounted cash flows | 3,722 | 3,416 |
Long-term debt | 31,733 | 18,688 |
Long-term debt, undiscounted cash flows | 32,855 | 18,873 |
Lease liabilities | 2,028 | 1,957 |
Lease liabilities, undiscounted cash flows | 2,616 | 2,498 |
Other long-term financial liabilities | 10 | 14 |
Other long-term financial liabilities, undiscounted cash flows | 10 | 14 |
Net carrying amount of derivatives (asset) | 1,136 | 895 |
Financial liabilities | 39,342 | 25,380 |
Financial liabilities, undiscounted cash flows | 40,124 | 26,813 |
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 | 2,985 | 2,200 |
Accounts payable and accrued liabilities, undiscounted cash flows | 3,722 | 3,416 |
Long-term debt, undiscounted cash flows | 1,828 | 1,551 |
Lease liabilities, undiscounted cash flows | 362 | 336 |
Other long-term financial liabilities, undiscounted cash flows | 0 | 0 |
Financial liabilities, undiscounted cash flows | 8,300 | 7,935 |
Net interest payments | 1,503 | 804 |
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 | 4,152 | 2,312 |
Lease liabilities, undiscounted cash flows | 716 | 677 |
Other long-term financial liabilities, undiscounted cash flows | 3 | 7 |
Financial liabilities, undiscounted cash flows | 4,783 | 2,675 |
Net interest payments | 2,639 | 1,444 |
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 | 6,954 | 3,520 |
Lease liabilities, undiscounted cash flows | 320 | 308 |
Other long-term financial liabilities, undiscounted cash flows | 2 | 2 |
Financial liabilities, undiscounted cash flows | 7,117 | 3,916 |
Net interest payments | 2,163 | 1,321 |
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 | 19,921 | 11,490 |
Lease liabilities, undiscounted cash flows | 1,218 | 1,177 |
Other long-term financial liabilities, undiscounted cash flows | 5 | 5 |
Financial liabilities, undiscounted cash flows | 19,924 | 12,287 |
Net interest payments | 13,345 | 7,789 |
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 | 1,200 | 1,374 |
Net carrying amount of derivatives (asset) | 1,300 | 1,354 |
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 | 1,200 | 1,240 |
Net carrying amount of derivatives (asset) | 1,300 | 1,217 |
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 | 0 | 134 |
Net carrying amount of derivatives (asset) | 0 | 137 |
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 | (54) | (36) |
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 | (54) | (36) |
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 | 215 | 1,390 |
Net carrying amount of derivatives (asset) | 215 | 1,401 |
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 | 215 | 1,390 |
Net carrying amount of derivatives (asset) | 215 | 1,401 |
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 | 20,221 | 11,313 |
Net carrying amount of derivatives (asset) | 22,131 | 11,717 |
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 | 1,543 | 1,297 |
Net carrying amount of derivatives (asset) | 1,986 | 1,084 |
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 | 2,382 | 1,504 |
Net carrying amount of derivatives (asset) | 2,470 | 1,822 |
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 | 3,295 | 1,607 |
Net carrying amount of derivatives (asset) | 3,454 | 1,521 |
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 | 13,001 | 6,905 |
Net carrying amount of derivatives (asset) | $ 14,221 | 7,290 |
Liquidity risk | Forward contract [member] |  |  |
Disclosure Of Maturity Analysis For Derivative And Non-derivative Financial Liabilities [Line Items] |  |  |
Derivative financial liabilities |  | 0 |
Derivative financial liabilities, undiscounted cash flows |  | 243 |
Liquidity risk | Forward contract [member] | Less than 1 year |  |  |
Disclosure Of Maturity Analysis For Derivative And Non-derivative Financial Liabilities [Line Items] |  |  |
Derivative financial liabilities, undiscounted cash flows |  | 243 |
Liquidity risk | Forward contract [member] | 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 | Forward contract [member] | 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 | Forward contract [member] | 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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