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Financial Risk Management - Liquidity Risk - Regulated Utilities (Details)
Dec. 31, 2016
USD ($)
Dec. 31, 2016
CAD
Dec. 31, 2015
CAD
Line of Credit Facility [Line Items]      
Maximum borrowing capacity   CAD 5,976,000,000 CAD 3,565,000,000
Short-term borrowings   1,155,000,000 511,000,000
Credit facility      
Line of Credit Facility [Line Items]      
Short-term borrowings   1,155,000,000 CAD 511,000,000
REGULATED      
Line of Credit Facility [Line Items]      
Maximum borrowing capacity   3,823,000,000  
REGULATED | Credit facility      
Line of Credit Facility [Line Items]      
Short-term borrowings   640,000,000  
REGULATED | ITC | Revolving credit facility      
Line of Credit Facility [Line Items]      
Maximum borrowing capacity | $ $ 1,000,000,000.0    
REGULATED | ITC | Commercial paper      
Line of Credit Facility [Line Items]      
Maximum borrowing capacity | $ 400,000,000    
REGULATED | ITC | Credit facility | Commercial paper      
Line of Credit Facility [Line Items]      
Short-term borrowings 145,000,000 195,000,000  
REGULATED | UNS Energy | Revolving credit facility      
Line of Credit Facility [Line Items]      
Maximum borrowing capacity | $ 350,000,000    
REGULATED | UNS Energy | Revolving credit facility | Unsecured Committed Revolving Credit Facility Maturing October 2021      
Line of Credit Facility [Line Items]      
Maximum borrowing capacity | $ 305,000,000    
REGULATED | UNS Energy | Revolving credit facility | Unsecured Committed Revolving Credit Facility Maturing October 2020      
Line of Credit Facility [Line Items]      
Maximum borrowing capacity | $ 45,000,000    
REGULATED | Central Hudson | Revolving credit facility      
Line of Credit Facility [Line Items]      
Maximum borrowing capacity | $ 200,000,000    
REGULATED | Central Hudson | Uncommitted credit facility      
Line of Credit Facility [Line Items]      
Maximum borrowing capacity | $ 25,000,000    
REGULATED | FortisBC Energy | Revolving credit facility      
Line of Credit Facility [Line Items]      
Maximum borrowing capacity   700,000,000  
REGULATED | FortisAlberta | Revolving credit facility      
Line of Credit Facility [Line Items]      
Maximum borrowing capacity   250,000,000  
REGULATED | FortisAlberta | Bilateral credit facility      
Line of Credit Facility [Line Items]      
Maximum borrowing capacity   90,000,000  
REGULATED | FortisBC Electric | Revolving credit facility      
Line of Credit Facility [Line Items]      
Maximum borrowing capacity   150,000,000  
REGULATED | FortisBC Electric | Demand overdraft      
Line of Credit Facility [Line Items]      
Maximum borrowing capacity   10,000,000  
REGULATED | Maritime Electric | Revolving credit facility      
Line of Credit Facility [Line Items]      
Maximum borrowing capacity   50,000,000  
REGULATED | Newfoundland Power Inc. | Revolving credit facility      
Line of Credit Facility [Line Items]      
Maximum borrowing capacity   100,000,000  
REGULATED | Newfoundland Power Inc. | Demand credit facility      
Line of Credit Facility [Line Items]      
Maximum borrowing capacity   20,000,000  
REGULATED | FortisOntario | Revolving credit facility      
Line of Credit Facility [Line Items]      
Maximum borrowing capacity   CAD 30,000,000  
REGULATED | Caribbean Utilities | Unsecured credit facility      
Line of Credit Facility [Line Items]      
Maximum borrowing capacity | $ 49,000,000    
REGULATED | Fortis Turks and Caicos | Demand credit facility      
Line of Credit Facility [Line Items]      
Maximum borrowing capacity | $ $ 31,000,000