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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 |

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