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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)

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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 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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- 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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- 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 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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- Details
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- Details
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- Details
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- Details
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