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INCOME TAXES - Deferred income taxes (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Movement of net deferred tax assets and liabilities    
Deferred tax assets (liabilities), beginning of period $ (2,910) $ (2,621)
Effect of IFRS 16 adoption (see note 2) 9  
(Expense) recovery in net income (443) (275)
(Expense) recovery in other comprehensive income (93) (14)
Deferred tax assets (liabilities), end of period (3,437) (2,910)
Property, plant and equipment and inventory    
Movement of net deferred tax assets and liabilities    
Deferred tax assets (liabilities), beginning of period (1,145) (1,060)
Effect of IFRS 16 adoption (see note 2) 0  
(Expense) recovery in net income (221) (85)
(Expense) recovery in other comprehensive income 0 0
Deferred tax assets (liabilities), end of period (1,366) (1,145)
Goodwill and other intangibles    
Movement of net deferred tax assets and liabilities    
Deferred tax assets (liabilities), beginning of period (1,192) (1,075)
Effect of IFRS 16 adoption (see note 2) 0  
(Expense) recovery in net income (126) (117)
(Expense) recovery in other comprehensive income 0 0
Deferred tax assets (liabilities), end of period (1,318) (1,192)
Investments    
Movement of net deferred tax assets and liabilities    
Deferred tax assets (liabilities), beginning of period (66) (126)
Effect of IFRS 16 adoption (see note 2) 0  
(Expense) recovery in net income 2 (3)
(Expense) recovery in other comprehensive income (104) 63
Deferred tax assets (liabilities), end of period (168) (66)
Non-capital loss carryforwards    
Movement of net deferred tax assets and liabilities    
Deferred tax assets (liabilities), beginning of period 29 18
Effect of IFRS 16 adoption (see note 2) 0  
(Expense) recovery in net income (17) 11
(Expense) recovery in other comprehensive income 0 0
Deferred tax assets (liabilities), end of period 12 29
Contract and deferred commission cost assets    
Movement of net deferred tax assets and liabilities    
Deferred tax assets (liabilities), beginning of period (515) (418)
Effect of IFRS 16 adoption (see note 2) 0  
(Expense) recovery in net income (55) (97)
(Expense) recovery in other comprehensive income 0 0
Deferred tax assets (liabilities), end of period (570) (515)
Other    
Movement of net deferred tax assets and liabilities    
Deferred tax assets (liabilities), beginning of period (21) 40
Effect of IFRS 16 adoption (see note 2) 9  
(Expense) recovery in net income (26) 16
(Expense) recovery in other comprehensive income 11 (77)
Deferred tax assets (liabilities), end of period $ (27) $ (21)