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Financial and capital management - Change in Allowance for Doubtful Accounts (Details) - CAD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Trade receivables
Reconciliation of changes in allowance account for credit losses of financial assets [abstract]
Balance, January 1	$ (62)	$ (51)
Additions	(134)	(114)
Usage and reversals	47	103
Balance, December 31	(149)	(62)
Contract assets
Reconciliation of changes in allowance account for credit losses of financial assets [abstract]
Balance, January 1	(68)	(73)
Additions	(31)	(28)
Usage and reversals	40	33
Balance, December 31	(59)	(68)
Current contract assets
Reconciliation of changes in allowance account for credit losses of financial assets [abstract]
Balance, January 1	(32)
Balance, December 31	(29)	(32)
Noncurrent contract assets
Reconciliation of changes in allowance account for credit losses of financial assets [abstract]
Balance, January 1	(36)
Balance, December 31	$ (30)	$ (36)

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 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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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 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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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 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

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X

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- Details

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