XML 120 R85.htm IDEA: XBRL DOCUMENT v3.8.0.1
Property, Plant and Equipment - Finance Leases - Additional Information (Detail) - CAD
CAD in Millions
Dec. 31, 2017
Dec. 31, 2016
Property plant and equipment under finance leases [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Carrying value of property, plant and equipment held under finance lease CAD 406 CAD 220
Land Building Plant and Equipment [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Carrying value of property, plant and equipment held under finance lease 192 220
Construction In Progress [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Carrying value of property, plant and equipment held under finance lease CAD 214 CAD 0