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FINANCIAL RISK MANAGEMENT AND FINANCIAL INSTRUMENTS - Credit Risk (Details) - CAD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Financial Instruments [Abstract] |  |  |
Restricted cash and cash equivalents | $ 0 | $ 12,837 |
Disclosure of financial assets that are either past due or impaired [line items] |  |  |
Contract assets | 276 | 197 | $ 204
Total customer accounts receivable and contract assets | 5,301 | 4,432 |
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 | 2 |
Accounts receivable |  |  |
Disclosure of financial assets that are either past due or impaired [line items] |  |  |
Financial assets | 5,025 | 4,235 |
Reconciliation of changes in allowance account for credit losses of financial assets [abstract] |  |  |
Balance, beginning of year | 184 | 243 |
Allowance for doubtful accounts expense 1 | 176 | 87 |
Acquired in business combination | 31 | 0 |
Net use | (178) | (146) |
Balance, end of year | 213 | 184 | $ 243
Accounts receivable | Unbilled financing receivables |  |  |
Disclosure of financial assets that are either past due or impaired [line items] |  |  |
Financial assets | 3,212 | 2,808 |
Accounts receivable | Less than 30 days past billing date |  |  |
Disclosure of financial assets that are either past due or impaired [line items] |  |  |
Financial assets | 1,270 | 977 |
Accounts receivable | 30-60 days past billing date |  |  |
Disclosure of financial assets that are either past due or impaired [line items] |  |  |
Financial assets | 324 | 236 |
Accounts receivable | 61-90 days past billing date |  |  |
Disclosure of financial assets that are either past due or impaired [line items] |  |  |
Financial assets | 118 | 111 |
Accounts receivable | Greater than 90 days past billing date |  |  |
Disclosure of financial assets that are either past due or impaired [line items] |  |  |
Financial assets | 101 | 103 |
Accounts receivable | Gross carrying amount |  |  |
Disclosure of financial assets that are either past due or impaired [line items] |  |  |
Financial assets | 626 | 513 |
Accounts receivable | Allowance for doubtful accounts |  |  |
Disclosure of financial assets that are either past due or impaired [line items] |  |  |
Financial assets | $ 211 | $ 182 |

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