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financial instruments - Credit risk (Details) - CAD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017 | Jan. 01, 2017
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Credit risk |  |  |
Maximum exposure (excluding income tax effects) to credit risk | $ 3,435 | $ 3,300 | $ 2,963
Cash and temporary investments, net |  |  |
Credit risk |  |  |
Maximum exposure (excluding income tax effects) to credit risk | 414 | 509 | 432
Customer accounts receivable |  |  |
Credit risk |  |  |
Maximum exposure (excluding income tax effects) to credit risk | 1,600 | 1,614 | 1,462
Contract assets |  |  |
Credit risk |  |  |
Maximum exposure (excluding income tax effects) to credit risk | 1,318 | 1,153 | 1,052
Derivatives |  |  |
Credit risk |  |  |
Maximum exposure (excluding income tax effects) to credit risk | $ 103 | $ 24 | $ 17

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- Definition The amount that best represents the maximum exposure to credit risk without taking into account any collateral held or other credit enhancements (for example, netting agreements that do not qualify for offset in accordance with IAS 32). [Refer: Credit risk [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2018-01-01 -Paragraph 35K -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2018-03-01&anchor=para_35K_a&doctype=Standard -URIDate 2018-03-16 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Note Expiry date 2021-01-01 -Name IFRS -Number 7 -IssueDate 2018-01-01 -Paragraph 36 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-02&anchor=para_36_a&doctype=Standard&book=b -URIDate 2018-03-16 + Details
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