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Investments Subject to Significant Influence and Equity Income (Variable Interest Entity) (Details) - CAD
CAD in Millions
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Consolidated Balance Sheets [Abstract]      
Assets, Current, Total CAD 2,511 CAD 2,596  
Property, Plant and Equipment, Net 17,290 6,469  
Other Assets, Noncurrent, Total 9,420 2,974  
Assets, Total 29,221 12,039  
Liabilities, Current, Total 3,724 1,367  
Liabilities, Noncurrent, Total 18,681 6,338  
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, Total 6,816 4,334 CAD 3,705
Liabilities and Equity, Total 29,221 12,039  
NSPML [Member]      
Consolidated Balance Sheets [Abstract]      
Assets, Current, Total 439 439  
Property, Plant and Equipment, Net 1,132 648  
Other Assets, Noncurrent, Total 276 554  
Assets, Total 1,847 1,641  
Liabilities, Current, Total 219 130  
Long-term Debt 1,288 1,288  
Liabilities, Noncurrent, Total 25 35  
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, Total 315 188  
Liabilities and Equity, Total CAD 1,847 CAD 1,641