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INCOME TAXES - Deferred income taxes (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Movement of net deferred tax assets and liabilities    
Deferred tax assets (liabilities), beginning of period $ (3,439) $ (3,196)
(Expense) recovery in net income (284) (111)
Recovery in other comprehensive income 71 (118)
Acquisitions 0 (14)
Deferred tax assets (liabilities), end of period (3,652) (3,439)
Tax losses in foreign jurisdictions, to be paid between 2023 and 2027 43  
Tax losses in foreign jurisdictions, carried forward indefinitely 30  
Property, plant and equipment and inventory    
Movement of net deferred tax assets and liabilities    
Deferred tax assets (liabilities), beginning of period (1,608) (1,484)
(Expense) recovery in net income (122) (122)
Recovery in other comprehensive income 0 0
Acquisitions 0 (2)
Deferred tax assets (liabilities), end of period (1,730) (1,608)
Goodwill and other intangibles    
Movement of net deferred tax assets and liabilities    
Deferred tax assets (liabilities), beginning of period (1,578) (1,450)
(Expense) recovery in net income (175) (116)
Recovery in other comprehensive income 0 0
Acquisitions (1) (12)
Deferred tax assets (liabilities), end of period (1,754) (1,578)
Investments    
Movement of net deferred tax assets and liabilities    
Deferred tax assets (liabilities), beginning of period (135) (130)
(Expense) recovery in net income (1) (2)
Recovery in other comprehensive income 47 (3)
Acquisitions 0 0
Deferred tax assets (liabilities), end of period (89) (135)
Non-capital loss carryforwards    
Movement of net deferred tax assets and liabilities    
Deferred tax assets (liabilities), beginning of period 24 16
(Expense) recovery in net income (19) 8
Recovery in other comprehensive income 0 0
Acquisitions 1 0
Deferred tax assets (liabilities), end of period 6 24
Contract and deferred commission cost assets    
Movement of net deferred tax assets and liabilities    
Deferred tax assets (liabilities), beginning of period (124) (183)
(Expense) recovery in net income 37 59
Recovery in other comprehensive income 0 0
Acquisitions 0 0
Deferred tax assets (liabilities), end of period (87) (124)
Other    
Movement of net deferred tax assets and liabilities    
Deferred tax assets (liabilities), beginning of period (18) 35
(Expense) recovery in net income (4) 62
Recovery in other comprehensive income 24 (115)
Acquisitions 0 0
Deferred tax assets (liabilities), end of period $ 2 $ (18)