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Draws on Credit Facility that are Designated as Net Investments in Foreign Operations (Parenthetical) (Detail)
CAD in Millions, $ in Millions
Jun. 30, 2015
USD ($)
Dec. 31, 2014
USD ($)
Dec. 31, 2014
CAD
Derivative Instruments And Hedging Activities Disclosures [Line Items]      
Credit facility $ 770 $ 704  
Canadian Dollars      
Derivative Instruments And Hedging Activities Disclosures [Line Items]      
Credit facility [1] 37   CAD 46
Canadian Dollars | Not Designated as Hedging Instrument      
Derivative Instruments And Hedging Activities Disclosures [Line Items]      
Credit facility $ 49    
[1] We have drawn an additional $49 million on the credit facility in Canadian dollars, which draw has not been designated as a hedging instrument.