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Financial and capital management - Equity price exposures (Details) - Equity price risk - CAD ($) $ in Millions | 12 Months Ended |
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Dec. 31, 2017 | Dec. 31, 2016
Disclosure of detailed information about hedging instruments [line items] |  |
Percentage of possible change in risk variable | 5.00% |
Interest rate exposure, interest rate percent decrease | 5.00% |
Reasonably possible change in risk variable impact on net earnings | $ 38 |
Forward contract | Settlement of share-based compensation plans |  |
Disclosure of detailed information about hedging instruments [line items] |  |
Financial instruments designated as hedging instruments, at fair value | $ 45 | $ 111

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- Definition Sensitivity Analysis For Types Of Market Risk, Reasonably Possible Change In Risk Variable, Impact On After Tax Earnings + References No definition available. + Details
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- Definition Sensitivity Analysis For Types Of Market Risk, Reasonably Possible Change In Risk Variable, Percent + References No definition available. + Details
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- Definition The fair value of financial instruments designated as hedging instruments. Hedging instruments are designated derivatives or (for a hedge of the risk of changes in foreign currency exchange rates only) designated non-derivative financial assets or non-derivative financial liabilities whose fair value or cash flows are expected to offset changes in the fair value or cash flows of a designated hedged item. [Refer: At fair value [member]; Derivatives [member]; Derivative financial assets; Derivative financial liabilities; Financial instruments, class [member]; Financial assets; Financial liabilities] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Note Expiry date 2018-01-01 -Name IFRS -Number 7 -IssueDate 2017-01-01 -Paragraph 22 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-02&anchor=para_22_b&doctype=Standard&book=B -URIDate 2017-03-09 + Details
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- Details
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