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Investments Subject to Significant Influence and Equity Income (Variable Interest Entity) (Details) - CAD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Consolidated Balance Sheets [Abstract]      
Assets, Current, Total $ 2,832 $ 2,526  
Property, Plant and Equipment, Net 18,712 16,995  
Other Assets, Noncurrent, Total 10,770 9,285  
Assets, Total 32,314 28,806  
Liabilities, Current, Total 4,553 3,946  
Liabilities, Noncurrent, Total 19,403 17,656  
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, Total 8,358 7,204 $ 6,845
Liabilities and Equity, Total 32,314 28,806  
NSPML [Member]      
Consolidated Balance Sheets [Abstract]      
Assets, Current, Total 86 225  
Property, Plant and Equipment, Net 1,690 1,720  
Other Assets, Noncurrent, Total 140 74  
Assets, Total 1,916 2,019  
Liabilities, Current, Total 21 180  
Long-term Debt 1,288 1,287  
Liabilities, Noncurrent, Total 62 42  
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, Total 545 510  
Liabilities and Equity, Total $ 1,916 $ 2,019