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Dispositions - Walden and Sale of Commercial Real Estate and Hotel Assets (Details) - CAD
CAD in Millions
1 Months Ended 12 Months Ended
Nov. 30, 2016
Feb. 29, 2016
Oct. 31, 2015
Jun. 30, 2015
Dec. 31, 2016
Dec. 31, 2015
Long Lived Assets Held-for-sale [Line Items]            
Gain (loss) on sale of non-regulated generation assets, net of expenses         CAD 0 CAD 56
Proceeds on sale of assets         50 922
Gain (loss) on sale of commercial real estate and hotel assets, net of expense and tax         CAD 0 109
Fortis Properties, Commercial Real Estate Assets            
Long Lived Assets Held-for-sale [Line Items]            
Proceeds on sale of assets       CAD 430    
Net gain (loss) on sale of commercial real estate and hotel assets       129    
Gain (loss) on sale of commercial real estate and hotel assets, net of expense and tax       109    
Trust units subscribed of Slate Office REIT       CAD 35    
Gross proceeds from sale of investment of Slate Office REIT CAD 37          
Fortis Properties, Hotel Assets            
Long Lived Assets Held-for-sale [Line Items]            
Proceeds on sale of assets     CAD 365      
Net gain (loss) on sale of commercial real estate and hotel assets     (20)      
Gain (loss) on sale of commercial real estate and hotel assets, net of expense and tax     CAD (8)      
Fortis Properties            
Long Lived Assets Held-for-sale [Line Items]            
Earnings before taxes related to disposal, excluding gain of sale           CAD 18
FortisBC Electric | Walden Hydroelectric Power Plant Assets            
Long Lived Assets Held-for-sale [Line Items]            
Proceeds from sale of assets   CAD 9        
Gain (loss) on sale of non-regulated generation assets, net of expense and tax   CAD 1