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INCOME TAXES - Deferred income taxes (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Movement of net deferred tax assets and liabilities    
Deferred tax assets (liabilities), beginning of period $ (3,437) $ (2,910)
Effect of IFRS 16 adoption   9
(Expense) recovery in net income 132 (443)
Recovery in other comprehensive income 122 (93)
Acquisitions (13)  
Deferred tax assets (liabilities), end of period (3,196) (3,437)
Property, plant and equipment and inventory    
Movement of net deferred tax assets and liabilities    
Deferred tax assets (liabilities), beginning of period (1,366) (1,145)
Effect of IFRS 16 adoption   0
(Expense) recovery in net income (108) (221)
Recovery in other comprehensive income 0 0
Acquisitions (10)  
Deferred tax assets (liabilities), end of period (1,484) (1,366)
Goodwill and other intangibles    
Movement of net deferred tax assets and liabilities    
Deferred tax assets (liabilities), beginning of period (1,318) (1,192)
Effect of IFRS 16 adoption   0
(Expense) recovery in net income (129) (126)
Recovery in other comprehensive income 0 0
Acquisitions (3)  
Deferred tax assets (liabilities), end of period (1,450) (1,318)
Investments    
Movement of net deferred tax assets and liabilities    
Deferred tax assets (liabilities), beginning of period (168) (66)
Effect of IFRS 16 adoption   0
(Expense) recovery in net income (2) 2
Recovery in other comprehensive income 40 (104)
Acquisitions 0  
Deferred tax assets (liabilities), end of period (130) (168)
Non-capital loss carryforwards    
Movement of net deferred tax assets and liabilities    
Deferred tax assets (liabilities), beginning of period 12 29
Effect of IFRS 16 adoption   0
(Expense) recovery in net income 4 (17)
Recovery in other comprehensive income 0 0
Acquisitions 0  
Deferred tax assets (liabilities), end of period 16 12
Contract and deferred commission cost assets    
Movement of net deferred tax assets and liabilities    
Deferred tax assets (liabilities), beginning of period (570) (515)
Effect of IFRS 16 adoption   0
(Expense) recovery in net income 387 (55)
Recovery in other comprehensive income 0 0
Acquisitions 0  
Deferred tax assets (liabilities), end of period (183) (570)
Other    
Movement of net deferred tax assets and liabilities    
Deferred tax assets (liabilities), beginning of period (27) (21)
Effect of IFRS 16 adoption   9
(Expense) recovery in net income (20) (26)
Recovery in other comprehensive income 82 11
Acquisitions 0  
Deferred tax assets (liabilities), end of period $ 35 $ (27)