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Equity - Summary of Accumulated Other Comprehensive Income (Loss) (Parenthetical) (Detail) - CAD CAD in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Disclosure of analysis of other comprehensive income by item [line items]
Foreign exchange differences on debt designated as a hedge of our investment in foreign subsidiaries net of tax	CAD (46)	CAD (27)
Gains reclassified to profit (loss) net of tax	2	(2)
Remeasurements of retirement benefit plans net of tax	(55)	(7)
Currency translation differences [member]
Disclosure of analysis of other comprehensive income by item [line items]
Foreign exchange differences on debt designated as a hedge of our investment in foreign subsidiaries net of tax	(46)	(27)
Available-for-sale financial assets [member]
Disclosure of analysis of other comprehensive income by item [line items]
Unrealized gains net of tax	1	(6)
Gains reclassified to profit (loss) net of tax	CAD 1	CAD 4

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- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

+ References

No definition available.

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The amount of income tax relating to amounts recognised in other comprehensive income in relation to available-for-sale financial assets. [Refer: Financial assets available-for-sale; Other comprehensive income]

+ References

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- Definition

The amount of income tax relating to amounts recognised in other comprehensive income in relation to exchange differences on the translation of financial statements of foreign operations. [Refer: Other comprehensive income; Reserve of exchange differences on translation]

+ References

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The amount of income tax relating to amounts recognised in other comprehensive income in relation to financial assets measured at fair value through other comprehensive income. [Refer: Financial assets measured at fair value through other comprehensive income; Other comprehensive income]

+ References

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The amount of income tax relating to amounts recognised in other comprehensive income in relation to remeasurements of defined benefit plans. [Refer: Other comprehensive income; Reserve of remeasurements of defined benefit plans; Defined benefit plans [member]]

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