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Draws on Credit Facility that are Designated as Net Investments in Foreign Operations (Parenthetical) (Detail)
In Millions, unless otherwise specified
Sep. 30, 2014
USD ($)
Dec. 31, 2013
USD ($)
Sep. 30, 2013
USD ($)
Sep. 30, 2014
Canadian Dollars
USD ($)
Sep. 30, 2014
Canadian Dollars
CAD
Sep. 30, 2014
Canadian Dollars
Not Designated as Hedging Instrument
USD ($)
Derivative Instruments And Hedging Activities Disclosures [Line Items]            
Credit facility $ 712 $ 946 $ 946 $ 28 [1] 31 [1] $ 67
[1] We have an additional $67 million outstanding on the credit facility in Canadian dollars, which draw has not been designated as a hedging instrument.