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Acquision (Purchase Consideration) (Details)
CAD in Millions
Dec. 31, 2016
CAD
Jul. 01, 2016
CAD
Dec. 31, 2015
CAD
Dec. 31, 2014
CAD
Fair value assigned to net assets:        
Goodwill CAD 6,213   CAD 264 CAD 222
TECO Energy Inc [Member]        
Multiple Foreign Currency Exchange Rates [Abstract]        
Foreign Currency Exchange Rate, Translation   1.3009    
Purchase Consideration   CAD 8,447    
Fair value assigned to net assets:        
Current Assets   619    
Regulatory assets (including current portion)   624    
Property, plant and equipment, net   10,023    
Other long-term assets   71    
Current libabilities   (747)    
Assumed long-term debt (including current portion)   (5,409)    
Regulatory liabilities (including current portion)   (1,117)    
Deferred Income Taxes   (800)    
Pension and post-retirement liabilities (including current portion)   (480)    
Other long-term liabilities   (146)    
Net: Less Cash And Cash Equivalents   2,638    
Cash and cash equivalents   38    
Fair value of net assets acquired   2,676    
Goodwill   5,771    
Business Combination, Acquired Receivables [Abstract]        
Fair Value, Acounts Receiveable   334    
Gross Contractual Amount   337    
Estimated Uncollectible   (3)    
Tampa Electric Division [Member]        
Fair value assigned to net assets:        
Goodwill   4,552    
Peoples Gas System Division [Member]        
Fair value assigned to net assets:        
Goodwill   744    
New Mexico Gas Company [Member]        
Fair value assigned to net assets:        
Goodwill   CAD 475