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Business Acquisitions - Aitken Creek (Details)
CAD in Millions, $ in Millions
1 Months Ended 12 Months Ended
Apr. 01, 2016
USD ($)
Apr. 01, 2016
CAD
Dec. 31, 2015
USD ($)
Dec. 31, 2015
CAD
Dec. 31, 2016
CAD
Bcf
Dec. 31, 2015
CAD
Dec. 31, 2014
CAD
Business Acquisition [Line Items]              
Cash purchase price, plus the cost of working gas inventory         CAD 4,841 CAD 38  
Goodwill (Note 12)       CAD 4,173 CAD 12,364 CAD 4,173 CAD 3,732
Aitken Creek Gas Storage ULC              
Business Acquisition [Line Items]              
Cash purchase price, plus the cost of working gas inventory $ 266 CAD 349          
Deposit on acquisition paid     $ 29 CAD 38      
Goodwill (Note 12)   CAD 27          
Aitken Creek | Aitken Creek Gas Storage ULC              
Business Acquisition [Line Items]              
Controlling ownership interest (percent)         93.80%    
Generating capacity (billion cubic feet) | Bcf         77    
North Aitken Creek | Aitken Creek Gas Storage ULC              
Business Acquisition [Line Items]              
Controlling ownership interest (percent)         100.00%