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Financial and capital management - Change in Allowance for Doubtful Accounts (Details) - CAD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Trade receivables
Reconciliation of changes in allowance account for credit losses of financial assets [abstract]
Balance, January 1	$ (129)	$ (136)
Additions	(126)	(109)
Usage and reversals	137	116
Balance, December 31	(118)	(129)
Contract assets
Reconciliation of changes in allowance account for credit losses of financial assets [abstract]
Balance, January 1	(19)	(20)
Additions	(40)	(20)
Usage and reversals	41	21
Balance, December 31	(18)	(19)
Current contract assets
Reconciliation of changes in allowance account for credit losses of financial assets [abstract]
Balance, January 1	(7)
Balance, December 31	(6)	(7)
Noncurrent contract assets
Reconciliation of changes in allowance account for credit losses of financial assets [abstract]
Balance, January 1	(12)
Balance, December 31	$ (12)	$ (12)

X

- 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 Expired 2023-01-01
-Name IFRS
-Number 7
-IssueDate 2023-01-01
-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 2023-03-23

+ Details

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Balance Type:	na
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X

- 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 Expired 2023-01-01
-Name IFRS
-Number 7
-IssueDate 2023-01-01
-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 2023-03-23

+ Details

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Balance Type:	credit
Period Type:	instant

X

- References

No definition available.

+ Details

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X

- 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 Expired 2023-01-01
-Name IFRS
-Number 7
-IssueDate 2023-01-01
-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 2023-03-23

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X

- Details

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X

- Details

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- Details

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X

- Details

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