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Trade and other receivables (Details) - CAD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
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Disclosure Of Trade And Other Receivables [Line Items] |  |
Current tax receivable | $ 92 | $ 23
Other accounts receivable | 234 | 188
Total trade and other receivables | 3,528 | 3,038
Wireless Equipment Installment Plan |  |
Disclosure Of Trade And Other Receivables [Line Items] |  |
Current trade receivables | 649 | 85
Non-current trade receivables | 399 | 65
Total wireless equipment installment plan receivables | 1,048 | 150
Current Assets | Wireless Equipment Installment Plan |  |
Disclosure Of Trade And Other Receivables [Line Items] |  |
Allowance for doubtful accounts | 28 | 9
Non-Current Assets | Wireless Equipment Installment Plan |  |
Disclosure Of Trade And Other Receivables [Line Items] |  |
Allowance for doubtful accounts | 17 | 5
Gross carrying amount |  |
Disclosure Of Trade And Other Receivables [Line Items] |  |
Current trade receivables | 3,414 | 2,981
Allowance for revenue adjustments |  |
Disclosure Of Trade And Other Receivables [Line Items] |  |
Current trade receivables | (185) | (104)
Allowance for doubtful accounts |  |
Disclosure Of Trade And Other Receivables [Line Items] |  |
Current trade receivables | (149) | (62)
Commodity taxes receivable |  |
Disclosure Of Trade And Other Receivables [Line Items] |  |
Current trade receivables | $ 122 | $ 12

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- Definition The amount of an allowance account used to record impairments to financial assets due to credit losses. [Refer: Financial assets] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Note Expiry date 2021-01-01 -Name IFRS -Number 7 -IssueDate 2020-01-01 -Paragraph 16 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2017-en-b&anchor=para_16&doctype=Standard&book=b -URIDate 2020-01-01 + Details
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