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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 |

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