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Financing (Income) Expenses (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Finance expenses breakdown    
Interest on debt and finance leases $ 897 $ 945
Capitalized interest at 5.4% ( 2017- 5.5%) (156) (729)
Interest expense 741 216
Interest on partnership liability 56 5
Interest on pension and other postretirement benefits 56 58
Accretion 266 247
Foreign exchange loss (gain) on U.S. dollar denominated debt 1,090 (771)
Foreign exchange and other (70) (52)
Loss on extinguishment of long-term debt 3 113
Realized gain on foreign currency hedges   (62)
Total Financing expenses $ 2,142 $ (246)
Debt instrument interest percentage 5.40% 5.50%