Draws on Credit Facility that are Designated as Net Investments in International Operations (Parenthetical) (Detail) (Canadian Dollars) In Millions, unless otherwise specified	Sep. 30, 2013 USD ($)		Sep. 30, 2013 CAD		Sep. 30, 2013 Not Designated as Hedging Instrument USD ($)
Debt Instrument Designated As Hedges Of Net Investment In Foreign Operations [Line Items]
Draws on the line of credit	$ 30	[1]	31	[1]	$ 74

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