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INVESTMENTS - Associates and Joint Venture Investment Impact (Details) - CAD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Jan. 01, 2019
Disclosure Of Associates And Joint Ventures [Line Items]      
Current assets $ 5,117 $ 4,888 $ 4,865
Current liabilities (5,964) (6,836) $ (6,971)
Net (loss) income 2,043 2,059  
Associates | Joint ventures      
Disclosure Of Associates And Joint Ventures [Line Items]      
Current assets 491 489  
Long-term assets 3,501 3,303  
Current liabilities (906) (740)  
Long-term liabilities (1,407) (1,258)  
Total net assets 1,679 1,794  
Our share of net assets 851 935  
Revenue 2,314 1,903  
Expenses (2,366) (1,902)  
Net (loss) income (52) 1  
Our share of net (loss) income $ (24) $ 0