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INCOME TAXES - Provision (Details) - CAD
CAD in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Current      
Canada CAD 117 CAD 45 CAD 104
Foreign 40 92 42
Total 157 137 146
Deferred      
Canada 97 33 307
Foreign 95 (135) 377
Total 192 (102) 684
Total Income Tax Expense/(Recovery) CAD 349 CAD 35 CAD 830