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INCOME TAXES - Narrative (Details)
12 Months Ended
Dec. 31, 2016
CAD
Dec. 31, 2015
CAD
Dec. 31, 2014
CAD
Dec. 31, 2016
USD ($)
Dec. 31, 2016
CAD
Dec. 31, 2015
USD ($)
Dec. 31, 2015
CAD
Net operating loss carryforwards              
Tax loss and credit carryforwards         CAD 2,049,000,000   CAD 1,325,000,000
Deferred income tax liabilities on the unremitted earnings of foreign investments         481,000,000   308,000,000
Income tax payments, net of refunds CAD 105,000,000 CAD 164,000,000 CAD 109,000,000        
Interest expense (reversal) reflected within net tax expense 0 (1,000,000) 0        
Income tax penalties expense CAD 0 CAD 0 CAD 0        
Accrued interest expense         4,000,000   4,000,000
Income tax penalties accrued         0   0
Canada federal and provincial              
Net operating loss carryforwards              
Unused net operating loss carryforwards         1,736,000,000   1,276,000,000
Capital loss carryforwards         0   0
Ccapital loss carryforwards unrecognized         654,000,000   75,000,000
Canada federal and provincial | Alternative minimum tax              
Net operating loss carryforwards              
Minimum tax credits         68,000,000   57,000,000
U.S. federal              
Net operating loss carryforwards              
Unused net operating loss carryforwards | $       $ 2,545,000,000   $ 1,617,000,000  
Tax loss and credit carryforwards         CAD 0   CAD 0
Operating loss carryforward unrecognized | $       58,000,000   0  
U.S. federal | Alternative minimum tax              
Net operating loss carryforwards              
Minimum tax credits | $       37,000,000   41,000,000  
Mexican Tax Authority              
Net operating loss carryforwards              
Tax loss and credit carryforwards | $       $ 54,000,000   $ 70,000,000