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FINANCIAL RISK MANAGEMENT AND FINANCIAL INSTRUMENTS - Credit Risk (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of financial assets that are either past due or impaired [line items]      
Contract assets $ 621 $ 1,791 $ 1,587
Total customer accounts receivable and contract assets 3,569 3,458  
COVID-19 Pandemic      
Reconciliation of changes in allowance account for credit losses of financial assets [abstract]      
Allowance for doubtful accounts expense 90    
Allowance for doubtful accounts      
Disclosure of financial assets that are either past due or impaired [line items]      
Contract assets 28 54  
Accounts receivable      
Disclosure of financial assets that are either past due or impaired [line items]      
Financial assets 2,948 1,667  
Reconciliation of changes in allowance account for credit losses of financial assets [abstract]      
Balance, beginning of year 114 127  
Allowance for doubtful accounts expense 307 238  
Net use (171) (251)  
Balance, end of year 250 114  
Accounts receivable | Unbilled financing receivables      
Disclosure of financial assets that are either past due or impaired [line items]      
Financial assets 1,806 148  
Accounts receivable | Less than 30 days past billing date      
Disclosure of financial assets that are either past due or impaired [line items]      
Financial assets 793 1,053  
Accounts receivable | 30-60 days past billing date      
Disclosure of financial assets that are either past due or impaired [line items]      
Financial assets 207 274  
Accounts receivable | 61-90 days past billing date      
Disclosure of financial assets that are either past due or impaired [line items]      
Financial assets 66 90  
Accounts receivable | Greater than 90 days past billing date      
Disclosure of financial assets that are either past due or impaired [line items]      
Financial assets 76 102  
Accounts receivable | Gross carrying amount      
Disclosure of financial assets that are either past due or impaired [line items]      
Financial assets 349 464  
Accounts receivable | Allowance for doubtful accounts      
Disclosure of financial assets that are either past due or impaired [line items]      
Financial assets $ 222 $ 60