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FINANCIAL RISK MANAGEMENT AND FINANCIAL INSTRUMENTS - Liquidity Risk (Details) - CAD ($)
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure Of Maturity Analysis For Derivative And Non-derivative Financial Liabilities [Line Items]      
Short-term borrowings $ 1,221,000,000 $ 2,238,000,000  
Accounts payable and accrued liabilities 2,714,000,000 3,033,000,000  
Long-term debt 18,201,000,000 15,967,000,000 $ 14,290,000,000
Lease liabilities 1,835,000,000 1,725,000,000 1,545,000,000
Expenditure derivatives | Cash flow hedges      
Disclosure Of Maturity Analysis For Derivative And Non-derivative Financial Liabilities [Line Items]      
Derivative financial liabilities 109,000,000    
Debt derivatives      
Disclosure Of Maturity Analysis For Derivative And Non-derivative Financial Liabilities [Line Items]      
Derivative financial liabilities 12,000,000 29,000,000  
Bond forwards | Cash flow hedges      
Disclosure Of Maturity Analysis For Derivative And Non-derivative Financial Liabilities [Line Items]      
Derivative financial liabilities 0 0 $ 87,000,000
Liquidity risk      
Disclosure Of Maturity Analysis For Derivative And Non-derivative Financial Liabilities [Line Items]      
Short-term borrowings 1,221,000,000 2,238,000,000  
Short-term borrowings, undiscounted cash flows 1,221,000,000 2,238,000,000  
Accounts payable and accrued liabilities 2,714,000,000 3,033,000,000  
Accounts payable and accrued liabilities, undiscounted cash flows 2,714,000,000 3,033,000,000  
Long-term debt 18,201,000,000 15,967,000,000  
Long-term debt, undiscounted cash flows 18,373,000,000 16,130,000,000  
Lease liabilities 1,835,000,000 1,725,000,000  
Lease liabilities, undiscounted cash flows 2,353,000,000 2,220,000,000  
Other long-term financial liabilities 22,000,000 26,000,000  
Other long-term financial liabilities, undiscounted cash flows 22,000,000 26,000,000  
Net carrying amount of derivatives (asset) (1,011,000,000) (1,439,000,000)  
Financial liabilities 22,982,000,000 21,550,000,000  
Financial liabilities, undiscounted cash flows 24,183,000,000 22,745,000,000  
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 1,221,000,000 2,238,000,000  
Accounts payable and accrued liabilities, undiscounted cash flows 2,714,000,000 3,033,000,000  
Long-term debt, undiscounted cash flows 1,450,000,000 0  
Lease liabilities, undiscounted cash flows 278,000,000 230,000,000  
Other long-term financial liabilities, undiscounted cash flows 0 0  
Financial liabilities, undiscounted cash flows 5,729,000,000 5,476,000,000  
Net interest payments 747,000,000 735,000,000  
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 3,274,000,000 2,050,000,000  
Lease liabilities, undiscounted cash flows 647,000,000 413,000,000  
Other long-term financial liabilities, undiscounted cash flows 14,000,000 12,000,000  
Financial liabilities, undiscounted cash flows 3,706,000,000 2,475,000,000  
Net interest payments 1,322,000,000 1,299,000,000  
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 1,490,000,000 2,353,000,000  
Lease liabilities, undiscounted cash flows 300,000,000 326,000,000  
Other long-term financial liabilities, undiscounted cash flows 2,000,000 7,000,000  
Financial liabilities, undiscounted cash flows 1,838,000,000 2,325,000,000  
Net interest payments 1,167,000,000 1,121,000,000  
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 12,159,000,000 11,727,000,000  
Lease liabilities, undiscounted cash flows 1,128,000,000 1,251,000,000  
Other long-term financial liabilities, undiscounted cash flows 6,000,000 7,000,000  
Financial liabilities, undiscounted cash flows 12,910,000,000 12,469,000,000  
Net interest payments 8,331,000,000 8,763,000,000  
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 2,134,000,000 1,287,000,000  
Net carrying amount of derivatives (asset) (2,024,000,000) (1,286,000,000)  
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 1,305,000,000 1,248,000,000  
Net carrying amount of derivatives (asset) (1,222,000,000) (1,247,000,000)  
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 829,000,000 39,000,000  
Net carrying amount of derivatives (asset) (802,000,000) (39,000,000)  
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 (34,000,000) (55,000,000)  
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 (34,000,000) (55,000,000)  
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 585,000,000 1,622,000,000  
Net carrying amount of derivatives (asset) (573,000,000) (1,593,000,000)  
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 585,000,000 1,622,000,000  
Net carrying amount of derivatives (asset) (573,000,000) (1,593,000,000)  
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 11,114,000,000 9,903,000,000  
Net carrying amount of derivatives (asset) (11,702,000,000) (10,780,000,000)  
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 86,000,000 0  
Net carrying amount of derivatives (asset) (81,000,000) 0  
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 2,516,000,000 0  
Net carrying amount of derivatives (asset) (2,772,000,000) 0  
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 937,000,000 1,392,000,000  
Net carrying amount of derivatives (asset) (891,000,000) (1,753,000,000)  
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 7,575,000,000 8,511,000,000  
Net carrying amount of derivatives (asset) $ (7,958,000,000) (9,027,000,000)  
Liquidity risk | Bond forwards      
Disclosure Of Maturity Analysis For Derivative And Non-derivative Financial Liabilities [Line Items]      
Derivative financial liabilities   0  
Derivative financial liabilities, undiscounted cash flows   0  
Liquidity risk | Bond forwards | Less than 1 year      
Disclosure Of Maturity Analysis For Derivative And Non-derivative Financial Liabilities [Line Items]      
Derivative financial liabilities, undiscounted cash flows   0  
Liquidity risk | Bond forwards | 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 | Bond forwards | 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 | Bond forwards | After 5 years      
Disclosure Of Maturity Analysis For Derivative And Non-derivative Financial Liabilities [Line Items]      
Derivative financial liabilities, undiscounted cash flows   $ 0