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Other Income and Charges (Details) - CAD
CAD in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Other Income and Expenses [Abstract]      
Foreign exchange loss on long-term debt CAD 297 CAD 11 CAD 2
Other foreign exchange (gains) losses (24) 0 2
Early redemption premium on notes 47 0 0
Other 15 8 13
Total other income and charges CAD 335 CAD 19 CAD 17