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ACCOUNTS RECEIVABLE (Details) - CAD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
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Disclosure of detailed information about financial instruments [line items] |  |
Total accounts receivable | $ 3,604 | $ 2,452
Current | 2,856 | 2,376
Long-term | 748 | 76
Gross carrying amount |  |
Disclosure of detailed information about financial instruments [line items] |  |
Customer accounts receivable | 3,170 | 1,727
Other accounts receivable | 656 | 785
Allowance for doubtful accounts |  |
Disclosure of detailed information about financial instruments [line items] |  |
Total accounts receivable | $ 222 | $ 60

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