Draws on Credit Facility that are Designated as Net Investments in International Operations (Detail) In Millions, unless otherwise specified	3 Months Ended				6 Months Ended						3 Months Ended		6 Months Ended			3 Months Ended		6 Months Ended
	Jun. 30, 2013 Canadian Dollars USD ($)		Jun. 15, 2012 Canadian Dollars USD ($)		Jun. 30, 2013 Canadian Dollars USD ($)		Jun. 15, 2012 Canadian Dollars USD ($)		Jun. 30, 2013 Canadian Dollars CAD		Jun. 30, 2013 Australian Dollars USD ($)	Jun. 15, 2012 Australian Dollars USD ($)	Jun. 30, 2013 Australian Dollars USD ($)	Jun. 15, 2012 Australian Dollars USD ($)	Jun. 30, 2013 Australian Dollars AUD	Jun. 30, 2013 Euros USD ($)	Jun. 15, 2012 Euros USD ($)	Jun. 30, 2013 Euros USD ($)	Jun. 15, 2012 Euros USD ($)	Jun. 30, 2013 Euros EUR (€)
Derivative [Line Items]
Balance Outstanding	$ 30	[1]			$ 30	[1]			31	[1]	$ 6		$ 6		7	$ 76		$ 76		€ 59
Gain (Loss)	$ 1	[1]		[1]	$ 2	[1]		[1]			$ 1		$ 1			$ (1)

[1] We have an additional $72 million outstanding on the credit facility in Canadian dollars that has not been designated as a hedging instrument.