Miscellaneous Financial Information - Additional Information (Detail) (CAD) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Additional Financial Information [Line Items]
Effect of LIFO inventory liquidation on income	24	45	10
Difference between LIFO carrying values and replacement cost of inventories	1,787	1,769
Research and development costs charged to expenses	154	147	120
Accounts payable and accrued liabilities included accrued taxes other than income taxes	380	377

Carrying value as of the balance sheet date of obligations incurred and payable for real and property taxes.

The effect of liquidating LIFO (last in first out) inventory layers on income.

The aggregate costs incurred (1) in a planned search or critical investigation aimed at discovery of new knowledge with the hope that such knowledge will be useful in developing a new product or service, a new process or technique, or in bringing about a significant improvement to an existing product or process; or (2) to translate research findings or other knowledge into a plan or design for a new product or process or for a significant improvement to an existing product or process whether intended for sale or the entity's use, during the reporting period charged to research and development projects, including the costs of developing computer software up to the point in time of achieving technological feasibility, and costs allocated in accounting for a business combination to in-process projects deemed to have no alternative future use.

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