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Investments Subject to Significant Influence and Equity Income (Variable Interest Entity) (Details) - CAD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Consolidated Balance Sheets [Abstract]      
Assets, Current, Total $ 2,526 $ 2,511  
Property, Plant and Equipment, Net 16,995 17,290  
Other Assets, Noncurrent, Total 9,250 9,420  
Assets, Total 28,771 29,221  
Liabilities, Current, Total 3,946 3,724  
Liabilities, Noncurrent, Total 17,644 18,681  
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, Total 7,181 6,816 $ 4,334
Liabilities and Equity, Total 28,771 29,221  
NSPML [Member]      
Consolidated Balance Sheets [Abstract]      
Assets, Current, Total 225 439  
Property, Plant and Equipment, Net 1,720 1,132  
Other Assets, Noncurrent, Total 74 276  
Assets, Total 2,019 1,847  
Liabilities, Current, Total 180 219  
Long-term Debt 1,287 1,288  
Liabilities, Noncurrent, Total 42 25  
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, Total 510 315  
Liabilities and Equity, Total $ 2,019 $ 1,847