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Draws on Credit Facility that are Designated as Net Investments in Foreign Operations (Parenthetical) (Detail)
CAD in Millions, $ in Millions
Mar. 31, 2017
USD ($)
Mar. 31, 2017
CAD
Dec. 31, 2016
USD ($)
Derivative Instruments And Hedging Activities Disclosures [Line Items]      
Credit facility $ 1,211   $ 1,206
Canadian Dollars      
Derivative Instruments And Hedging Activities Disclosures [Line Items]      
Credit facility [1] 35 CAD 46  
Canadian Dollars | Not Designated as Hedging Instrument      
Derivative Instruments And Hedging Activities Disclosures [Line Items]      
Credit facility $ 45    
[1] We have drawn an additional $45 million on the credit facility in Canadian dollars, which has not been designated as a hedging instrument.