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Draws on Credit Facility that are Designated as Net Investments in International Operations (Parenthetical) (Detail) (Not Designated as Hedging Instrument, Canadian Dollars, USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012
Not Designated as Hedging Instrument \| Canadian Dollars
Derivative [Line Items]
Draws on the line of credit	$ 86

The cash inflow from a contractual arrangement with the lender, including letter of credit, standby letter of credit and revolving credit arrangements, under which borrowings can be made up to a specific amount at any point in time with either short term or long term maturity that is collateralized (backed by pledge, mortgage or other lien in the entity's assets).

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