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Balance Sheet Classification of Deferred Income Tax Asset / (Liability) (Detail) - CAD
CAD in Millions
Sep. 30, 2016
Dec. 31, 2015
New Accounting Pronouncement, Early Adoption [Line Items]    
Deferred income tax asset [1]   CAD (272)
Deferred income tax liabilities [1] CAD (4,008) (4,191)
Accounting Standards Update 2015-17    
New Accounting Pronouncement, Early Adoption [Line Items]    
Deferred income tax asset   272
Deferred income tax liabilities (4,008) (4,191)
Net deferred tax liabilities (3,973) (3,960)
Accounting Standards Update 2015-17 | Other assets, including intangibles, net    
New Accounting Pronouncement, Early Adoption [Line Items]    
Deferred income tax asset, noncurrent CAD 35  
Accounting Standards Update 2015-17 | Accounts payable and accrued liabilities    
New Accounting Pronouncement, Early Adoption [Line Items]    
Deferred income tax liabilities, current   CAD (41)
[1] Deferred tax assets and liabilities have been prospectively classified as non-current. Prior periods were not restated (note 12).