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SEGMENTED INFORMATION (Details 2) (CAD)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
GEOGRAPHIC INFORMATION      
Revenues 25,306 27,053 21,520
Property, plant and equipment, net 33,318 29,074  
Canada
     
GEOGRAPHIC INFORMATION      
Revenues 12,171 12,097 9,385
Property, plant and equipment, net 19,293 16,690  
United States
     
GEOGRAPHIC INFORMATION      
Revenues 13,135 14,956 12,135
Property, plant and equipment, net 14,025 12,384