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FINANCIAL RISK MANAGEMENT AND FINANCIAL INSTRUMENTS - Credit Risk (Details) - CAD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Disclosure of financial assets that are either past due or impaired [line items] |  |  |
Contract assets | $ 204 | $ 621 | $ 1,791
Total customer accounts receivable and contract assets | 4,114 | 3,569 |
Allowance for doubtful accounts |  |  |
Disclosure of financial assets that are either past due or impaired [line items] |  |  |
Contract assets | 3 | 28 |
Accounts receivable |  |  |
Disclosure of financial assets that are either past due or impaired [line items] |  |  |
Financial assets | 3,910 | 2,948 |
Reconciliation of changes in allowance account for credit losses of financial assets [abstract] |  |  |
Balance, beginning of year | 250 | 114 |
Allowance for doubtful accounts expense | 155 | 307 |
Net use | (162) | (171) |
Balance, end of year | 243 | 250 |
Accounts receivable | Unbilled financing receivables |  |  |
Disclosure of financial assets that are either past due or impaired [line items] |  |  |
Financial assets | 2,646 | 1,806 |
Accounts receivable | Less than 30 days past billing date |  |  |
Disclosure of financial assets that are either past due or impaired [line items] |  |  |
Financial assets | 895 | 793 |
Accounts receivable | 30-60 days past billing date |  |  |
Disclosure of financial assets that are either past due or impaired [line items] |  |  |
Financial assets | 214 | 207 |
Accounts receivable | 61-90 days past billing date |  |  |
Disclosure of financial assets that are either past due or impaired [line items] |  |  |
Financial assets | 89 | 66 |
Accounts receivable | Greater than 90 days past billing date |  |  |
Disclosure of financial assets that are either past due or impaired [line items] |  |  |
Financial assets | 66 | 76 |
Accounts receivable | Gross carrying amount |  |  |
Disclosure of financial assets that are either past due or impaired [line items] |  |  |
Financial assets | 442 | 435 |
Accounts receivable | Allowance for doubtful accounts |  |  |
Disclosure of financial assets that are either past due or impaired [line items] |  |  |
Financial assets | $ 240 | $ 222 |

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