Draws on Credit Facility that are Designated as Net Investments in International Operations (Detail) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended				9 Months Ended		3 Months Ended		9 Months Ended
	Sep. 30, 2013 Canadian Dollars USD ($)		Sep. 30, 2013 Canadian Dollars USD ($)		Sep. 30, 2013 Canadian Dollars CAD		Sep. 30, 2013 Australian Dollars USD ($)	Sep. 30, 2013 Australian Dollars AUD	Sep. 30, 2013 Euros USD ($)	Sep. 07, 2012 Euros USD ($)	Sep. 07, 2012 Euros USD ($)	Sep. 30, 2013 Euros USD ($)	Sep. 30, 2013 Euros EUR (€)
Debt Instrument Designated As Hedges Of Net Investment In Foreign Operations [Line Items]
Balance outstanding	$ 30	[1]	$ 30	[1]	31	[1]	$ 6	7	$ 100			$ 100	€ 74
Gain (Loss)	$ (1)	[1]	$ 1	[1]			$ 1		$ (3)	$ (1)	$ (1)	$ (3)

[1] We have an additional $74 million outstanding on the credit facility in Canadian dollars that has not been designated as a hedging instrument.