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FINANCIAL RISK MANAGEMENT AND FINANCIAL INSTRUMENTS - Credit Risk (Details) - CAD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Disclosure of financial assets that are either past due or impaired [line items] |  |  |
Contract assets | $ 268 | $ 276 | $ 197
Total customer accounts receivable and contract assets | 5,804 | 5,301 |
Trade Receivables and Contract Assets | Allowance for doubtful accounts |  |  |
Disclosure of financial assets that are either past due or impaired [line items] |  |  |
Financial assets | 227 | 213 | $ 184
Reconciliation of changes in allowance account for credit losses of financial assets [abstract] |  |  |
Balance, beginning of year | 213 | 184 |
Allowance for doubtful accounts expense | 259 | 176 |
Acquired in business combination | 0 | 31 |
Net use | (245) | (178) |
Balance, end of year | 227 | 213 |
Accounts receivable |  |  |
Disclosure of financial assets that are either past due or impaired [line items] |  |  |
Financial assets | 5,536 | 5,025 |
Reconciliation of changes in allowance account for credit losses of financial assets [abstract] |  |  |
Balance, beginning of year | 5,025 |  |
Balance, end of year | 5,536 | 5,025 |
Accounts receivable | Unbilled financing receivables |  |  |
Disclosure of financial assets that are either past due or impaired [line items] |  |  |
Financial assets | 3,530 | 3,212 |
Reconciliation of changes in allowance account for credit losses of financial assets [abstract] |  |  |
Balance, beginning of year | 3,212 |  |
Balance, end of year | 3,530 | 3,212 |
Accounts receivable | Less than 30 days past billing date |  |  |
Disclosure of financial assets that are either past due or impaired [line items] |  |  |
Financial assets | 1,419 | 1,270 |
Reconciliation of changes in allowance account for credit losses of financial assets [abstract] |  |  |
Balance, beginning of year | 1,270 |  |
Balance, end of year | 1,419 | 1,270 |
Accounts receivable | 30-60 days past billing date |  |  |
Disclosure of financial assets that are either past due or impaired [line items] |  |  |
Financial assets | 334 | 324 |
Reconciliation of changes in allowance account for credit losses of financial assets [abstract] |  |  |
Balance, beginning of year | 324 |  |
Balance, end of year | 334 | 324 |
Accounts receivable | 61-90 days past billing date |  |  |
Disclosure of financial assets that are either past due or impaired [line items] |  |  |
Financial assets | 122 | 118 |
Reconciliation of changes in allowance account for credit losses of financial assets [abstract] |  |  |
Balance, beginning of year | 118 |  |
Balance, end of year | 122 | 118 |
Accounts receivable | Greater than 90 days past billing date |  |  |
Disclosure of financial assets that are either past due or impaired [line items] |  |  |
Financial assets | 131 | 101 |
Reconciliation of changes in allowance account for credit losses of financial assets [abstract] |  |  |
Balance, beginning of year | 101 |  |
Balance, end of year | 131 | 101 |
Accounts receivable | Gross carrying amount |  |  |
Disclosure of financial assets that are either past due or impaired [line items] |  |  |
Financial assets | 687 | 626 |
Reconciliation of changes in allowance account for credit losses of financial assets [abstract] |  |  |
Balance, beginning of year | 626 |  |
Balance, end of year | 687 | 626 |
Accounts receivable | Allowance for doubtful accounts |  |  |
Disclosure of financial assets that are either past due or impaired [line items] |  |  |
Financial assets | 226 | 211 |
Reconciliation of changes in allowance account for credit losses of financial assets [abstract] |  |  |
Balance, beginning of year | 211 |  |
Balance, end of year | 226 | 211 |
Contract assets |  |  |
Disclosure of financial assets that are either past due or impaired [line items] |  |  |
Contract assets | 268 | 276 |
Contract assets | Allowance for doubtful accounts |  |  |
Disclosure of financial assets that are either past due or impaired [line items] |  |  |
Contract assets | $ 1 | $ 2 |

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