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Financial and capital management - Change in Allowance for Doubtful Accounts (Details) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Trade receivables |  |
Reconciliation of changes in allowance account for credit losses of financial assets [abstract] |  |
Balance, January 1 | $ (54) | $ (60)
Additions | (84) | (99)
Usage | 91 | 105
Balance, December 31 | (51) | (54)
Trade receivables | IFRS 9 |  |
Reconciliation of changes in allowance account for credit losses of financial assets [abstract] |  |
Balance, January 1 | (4) | 0
Balance, December 31 |  | (4)
Contract assets |  |
Reconciliation of changes in allowance account for credit losses of financial assets [abstract] |  |
Balance, January 1 | (96) | (92)
Additions | (50) | (39)
Usage | 55 | 35
Balance, December 31 | (91) | (96)
Current contract assets |  |
Reconciliation of changes in allowance account for credit losses of financial assets [abstract] |  |
Balance, January 1 | (47) |
Balance, December 31 | (44) | (47)
Noncurrent contract assets |  |
Reconciliation of changes in allowance account for credit losses of financial assets [abstract] |  |
Balance, January 1 | (49) |
Balance, December 31 | $ (47) | $ (49)

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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 2018-01-01 -Paragraph 16 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-02&anchor=para_16&doctype=Standard&book=b -URIDate 2018-03-16 + Details
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Balance Type: | na
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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 2018-01-01 -Paragraph 16 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-02&anchor=para_16&doctype=Standard&book=b -URIDate 2018-03-16 + 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 2021-01-01 -Name IFRS -Number 7 -IssueDate 2018-01-01 -Paragraph 16 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-02&anchor=para_16&doctype=Standard&book=b -URIDate 2018-03-16 + 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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