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Financial and capital management - Change in Allowance for Doubtful Accounts (Details) - CAD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021
Trade receivables |  |
Reconciliation of changes in allowance account for credit losses of financial assets [abstract] |  |
Balance, January 1 | $ (136) | $ (149)
Additions | (109) | (83)
Usage and reversals | 116 | 96
Balance, December 31 | (129) | (136)
Contract assets |  |
Reconciliation of changes in allowance account for credit losses of financial assets [abstract] |  |
Balance, January 1 | (20) | (59)
Additions | (20) | (9)
Usage and reversals | 21 | 48
Balance, December 31 | (19) | (20)
Current contract assets |  |
Reconciliation of changes in allowance account for credit losses of financial assets [abstract] |  |
Balance, January 1 | (6) |
Balance, December 31 | (7) | (6)
Noncurrent contract assets |  |
Reconciliation of changes in allowance account for credit losses of financial assets [abstract] |  |
Balance, January 1 | (14) |
Balance, December 31 | $ (12) | $ (14)

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- Definition The amount of additional allowance for credit losses of financial assets recognised in profit or loss. [Refer: Allowance account for credit losses of financial assets] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Note Expiry date 2023-01-01 -Name IFRS -Number 7 -IssueDate 2022-03-24 -Paragraph 16 -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2017-en-b&anchor=para_16&doctype=Standard&book=b -URIDate 2022-03-24 + Details
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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 2022-03-24 -Paragraph 16 -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2017-en-b&anchor=para_16&doctype=Standard&book=b -URIDate 2022-03-24 + Details
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Balance Type: | credit
Period Type: | instant

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- References No definition available. + Details
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- Definition The decrease in an allowance account for credit losses of financial assets resulting from the utilisation of the allowance. [Refer: Allowance account for credit losses of financial assets] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Note Expiry date 2023-01-01 -Name IFRS -Number 7 -IssueDate 2022-03-24 -Paragraph 16 -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2017-en-b&anchor=para_16&doctype=Standard&book=b -URIDate 2022-03-24 + Details
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- Details
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- Details
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- Details
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- Details
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