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SIGNIFICANT ACCOUNTING POLICIES (Details) - CAD ($) $ in Millions | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Disclosure of reclassifications or changes in presentation [line items] |  |  |
Reclassification from other current assets |  | $ (516) | $ (452)
Reclassification to accounts receivable |  | 2,856 | 2,376
Reclassification to (from) other long-term assets |  | 346 | 756
Reclassification to financing receivables |  | 748 | 76
Reclassification from net change in contract asset balances |  | 1,170 | (204)
Reclassification to change in operating assets and liabilities |  | 333 | 462
Reclassification from net change in financing receivables |  | (1,658) | (120)
Goodwill |  | 3,973 | 3,923
COVID-19 Pandemic |  |  |
Disclosure of reclassifications or changes in presentation [line items] |  |  |
Funding qualified for |  | 91 |
Proceeds from government grants |  | 82 |
COVID-19 Pandemic | Forecast |  |  |
Disclosure of reclassifications or changes in presentation [line items] |  |  |
Proceeds from government grants | $ 9 |  |
Several individually immaterial acquisitions |  |  |
Disclosure of reclassifications or changes in presentation [line items] |  |  |
Goodwill |  | 50 |
Reclassification adjustment | Financing receivables |  |  |
Disclosure of reclassifications or changes in presentation [line items] |  |  |
Reclassification from other current assets |  | 1,031 | 72
Reclassification to accounts receivable |  | 1,031 | 72
Reclassification to (from) other long-term assets |  | (748) | (76)
Reclassification to financing receivables |  | 748 | 76
Reclassification to change in operating assets and liabilities |  | 1,658 | (120)
Reclassification from net change in financing receivables |  | 1,658 | (120)
Reclassification adjustment | Contract assets |  |  |
Disclosure of reclassifications or changes in presentation [line items] |  |  |
Reclassification to (from) other long-term assets |  | 88 | 557
Reclassification from contract assets |  | 88 | 557
Reclassification from net change in contract asset balances |  | 1,170 | (204)
Reclassification to change in operating assets and liabilities |  | $ 1,170 | $ (204)

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