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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
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