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Trade and other receivables (Details) - CAD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020
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Disclosure Of Trade And Other Receivables [Line Items] |  |
Current receivables from taxes other than income tax | $ 121 | $ 92
Other accounts receivable | 188 | 234
Total trade and other receivables | 3,949 | 3,528
Wireless Equipment Installment Plan |  |
Disclosure Of Trade And Other Receivables [Line Items] |  |
Current trade receivables | 1,040 | 649
Non-current trade receivables | 387 | 399
Total wireless equipment installment plan receivables | 1,427 | 1,048
Current Assets | Wireless Equipment Installment Plan |  |
Disclosure Of Trade And Other Receivables [Line Items] |  |
Allowance for doubtful accounts | 44 | 28
Non-Current Assets | Wireless Equipment Installment Plan |  |
Disclosure Of Trade And Other Receivables [Line Items] |  |
Allowance for doubtful accounts | 15 | 17
Gross carrying amount |  |
Disclosure Of Trade And Other Receivables [Line Items] |  |
Current trade receivables | 3,843 | 3,414
Allowance for revenue adjustments |  |
Disclosure Of Trade And Other Receivables [Line Items] |  |
Current trade receivables | (169) | (185)
Allowance for doubtful accounts |  |
Disclosure Of Trade And Other Receivables [Line Items] |  |
Current trade receivables | (136) | (149)
Commodity taxes receivable |  |
Disclosure Of Trade And Other Receivables [Line Items] |  |
Current trade receivables | $ 102 | $ 122

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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 2023-01-01 -Name IFRS -Number 7 -IssueDate 2021-01-01 -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 2021-03-24 + Details
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- Definition The amount of current receivables from taxes other than income tax. [Refer: Receivables from taxes other than income tax] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2021-01-01 -Paragraph 78 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_78_b&doctype=Standard -URIDate 2021-03-24 + Details
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