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Adoption of New IFRS Pronouncements - Additional Information (Detail) - CAD ($) |  | 12 Months Ended
--- | --- | ---
Jan. 01, 2018 | Dec. 31, 2017
Disclosure of retrospective adjustments of financial statements [line items] |  |
Decrease in basic earnings per share |  | $ 0.08
Decrease in diluted earnings per share |  | $ 0.09
Effect of IFRS 9 Upon Adoption [member] |  |
Disclosure of retrospective adjustments of financial statements [line items] |  |
Impact on retained earnings | $ 0 |
Reclassification of loss from retained earnings to accumulated other comprehensive income (loss) | (41,000,000) |
Reclassification of loss from retained earnings to accumulated other comprehensive income (loss) after tax | (34,000,000) |
Effect of IFRS 9 Upon Adoption [member] | Amortized cost to fair value through profit or loss [member] |  |
Disclosure of retrospective adjustments of financial statements [line items] |  |
Cash equivalents | 640,000,000 |
Effect of IFRS 9 Upon Adoption [member] | Financial assets at fair value through other comprehensive income [member] |  |
Disclosure of retrospective adjustments of financial statements [line items] |  |
Marketable equity securities | 124,000,000 |
Debt securities | $ 41,000,000 |

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- Definition The amount of short-term, highly liquid investments that are readily convertible to known amounts of cash and that are subject to an insignificant risk of changes in value. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 7 -IssueDate 2018-01-01 -Paragraph 45 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=7&date=2018-03-01&anchor=para_45&doctype=Standard -URIDate 2018-03-16 + Details
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