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FINANCIAL RISK MANAGEMENT AND FINANCIAL INSTRUMENTS - Credit Risk (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Reconciliation of changes in allowance account for credit losses of financial assets [abstract]    
Balance, beginning of year $ 61  
Balance, beginning of year 55 $ 61
Accounts receivable    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 1,474 1,382
Reconciliation of changes in allowance account for credit losses of financial assets [abstract]    
Balance, beginning of year 61 59
Allowance for doubtful accounts expense 201 179
Net use (207) (177)
Recoveries 17 0
Balance, beginning of year 55 61
Accounts receivable | Less than 30 days past billing date    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 970 894
Accounts receivable | 30-60 days past billing date    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 300 303
Accounts receivable | 61-90 days past billing date    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 100 113
Accounts receivable | Greater than 90 days past billing date    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 104 72
Accounts receivable | Gross carrying amount    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets $ 477 $ 489