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FINANCIAL RISK MANAGEMENT AND FINANCIAL INSTRUMENTS - Credit Risk (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Financial Instruments [Abstract]      
Restricted cash and cash equivalents $ 12,837 $ 0  
Disclosure of financial assets that are either past due or impaired [line items]      
Contract assets 197 204 $ 621
Total customer accounts receivable and contract assets 4,432 4,114  
COVID-19 Pandemic      
Reconciliation of changes in allowance account for credit losses of financial assets [abstract]      
Government Grant, Qualified Amount During Period 60   (90)
Allowance for doubtful accounts      
Disclosure of financial assets that are either past due or impaired [line items]      
Contract assets 2 3  
Accounts receivable      
Disclosure of financial assets that are either past due or impaired [line items]      
Financial assets 4,235 3,910  
Reconciliation of changes in allowance account for credit losses of financial assets [abstract]      
Balance, beginning of year 243 250  
Allowance for doubtful accounts expense 1 87 155  
Net use (146) (162)  
Balance, end of year 184 243 $ 250
Accounts receivable | Unbilled financing receivables      
Disclosure of financial assets that are either past due or impaired [line items]      
Financial assets 2,808 2,646  
Accounts receivable | Less than 30 days past billing date      
Disclosure of financial assets that are either past due or impaired [line items]      
Financial assets 977 895  
Accounts receivable | 30-60 days past billing date      
Disclosure of financial assets that are either past due or impaired [line items]      
Financial assets 236 214  
Accounts receivable | 61-90 days past billing date      
Disclosure of financial assets that are either past due or impaired [line items]      
Financial assets 111 89  
Accounts receivable | Greater than 90 days past billing date      
Disclosure of financial assets that are either past due or impaired [line items]      
Financial assets 103 66  
Accounts receivable | Gross carrying amount      
Disclosure of financial assets that are either past due or impaired [line items]      
Financial assets 513 442  
Accounts receivable | Allowance for doubtful accounts      
Disclosure of financial assets that are either past due or impaired [line items]      
Financial assets $ 182 $ 240