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Debt - Credit Facility (Narrative) (Detail)
CAD in Millions, $ in Billions
Dec. 31, 2015
CAD
Sep. 17, 2015
USD ($)
Dec. 31, 2014
CAD
Sep. 26, 2014
USD ($)
Revolving Credit Facility [Member]        
Debt Instrument [Line Items]        
Credit total available amount | $       $ 2
Five Year Portion [Member]        
Debt Instrument [Line Items]        
Credit total available amount | $   $ 1   1
One Year Plus One Year Term Out Portion [Member]        
Debt Instrument [Line Items]        
Credit total available amount | $   $ 1   $ 1
Letter of Credit [Member]        
Debt Instrument [Line Items]        
Letters of credit drawn | CAD CAD 375   CAD 412  
Maximum capacity under credit facility | CAD CAD 600   600  
Restricted cash and cash equivalents | CAD     CAD 0