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Financial Risk Management - Liquidity Risk (Details)
CAD in Millions
 12 Months Ended
Dec. 31, 2016
USD ($)
Dec. 31, 2016
CAD
Dec. 31, 2015
CAD
Line of Credit Facility [Line Items]      
Short-term borrowings   CAD 1,155 CAD 511
Maximum borrowing capacity   5,976 3,565
Credit facilities unused     2,399
Credit facility | Bank concentration risk      
Line of Credit Facility [Line Items]      
Concentration risk percentage 20.00%    
Line of Credit Facilities Maturing 2017 through 2021 [Member]      
Line of Credit Facility [Line Items]      
Maximum borrowing capacity   5,100  
Committed revolving corporate credit facility      
Line of Credit Facility [Line Items]      
Credit facilities unused   3,729  
Fixed-term debt      
Line of Credit Facility [Line Items]      
Principal repayments in the next five years   680  
Credit facility      
Line of Credit Facility [Line Items]      
Short-term borrowings   1,155 CAD 511
Corporate | Committed revolving corporate credit facility      
Line of Credit Facility [Line Items]      
Credit facilities unused   915  
REGULATED      
Line of Credit Facility [Line Items]      
Maximum borrowing capacity   3,823  
Credit facilities unused   2,607  
REGULATED | Credit facility      
Line of Credit Facility [Line Items]      
Short-term borrowings   640  
REGULATED | ITC | Committed revolving corporate 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 CAD 195