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Business Acquisitions - ITC Holdings (Details)
CAD / shares in Units, $ / shares in Units, km in Thousands, MW in Thousands, $ in Millions
3 Months Ended 12 Months Ended
Oct. 14, 2016
USD ($)
station
km
$ / shares
CAD / $
shares
Oct. 14, 2016
CAD
shares
Dec. 31, 2016
USD ($)
station
km
CAD / $
Dec. 31, 2016
CAD
Dec. 31, 2016
CAD
MW
Dec. 31, 2015
CAD
CAD / $
Oct. 31, 2016
Oct. 13, 2016
CAD / shares
CAD / $
Business Acquisition [Line Items]                
Advances from non-controlling interests         CAD 1,361,000,000 CAD 20,000,000    
Share consideration         CAD 4,684,000,000 CAD 0    
Closing share price (CAD per share) | CAD / shares               CAD 40.96
Foreign exchange rate (CAD per USD) | CAD / $ 1.32   1.34     1.38   1.32
ITC                
Business Acquisition [Line Items]                
Combined peak transmission line capacity (MW) (more than) | MW         26      
Area of operation (km) | km     25          
Generating facilities | station 570   570          
Unsecured | ITC                
Business Acquisition [Line Items]                
Face value | $     $ 385          
ITC                
Business Acquisition [Line Items]                
Noncontrolling ownership (percent) 19.90%           19.90%  
ITC                
Business Acquisition [Line Items]                
Aggregate purchase price $ 11,800 CAD 15,700,000,000            
Consolidated indebtedness at fair value acquired $ 4,800 CAD 6,300,000,000            
Cash paid per share (USD per share) | $ / shares $ 22.57              
Entity shares issued per acquiree share | shares 0.7520 0.7520            
Cash and share consideration given $ 7,000 CAD 9,342,000,000            
Payment for ownership 3,500 CAD 4,658,000,000            
Advances from non-controlling interests | $ $ 1,228              
Shares issued per share purchased | shares 114,400,000 114,400,000            
Share consideration $ 3,500 CAD 4,684,000,000            
Combined peak transmission line capacity (MW) (more than) | MW         26      
Area of operation (km) | km 25              
Acquisition-related expenses         CAD 118,000,000 CAD 10,000,000    
Acquisition-related expenses, net of tax         90,000,000 7,000,000    
Accelerated vesting of the stock-based compensation awards     17 CAD 22,000,000        
ITC | Operating expenses                
Business Acquisition [Line Items]                
Acquisition-related expenses         79,000,000 10,000,000    
Acquisition-related expenses, net of tax         62,000,000 7,000,000    
ITC | Finance charges                
Business Acquisition [Line Items]                
Acquisition-related expenses         39,000,000 0    
Acquisition-related expenses, net of tax         CAD 28,000,000 CAD 0    
ITC | ITC                
Business Acquisition [Line Items]                
Accelerated vesting of the stock-based compensation awards     $ 21 CAD 27,000,000        
ITC | Unsecured                
Business Acquisition [Line Items]                
Face value | $ $ 2,000              
ITC | Unsecured | 6.00% Unsecured US Shareholder Note                
Business Acquisition [Line Items]                
Face value | $ 199              
Bridge loan | ITC | Credit facility                
Business Acquisition [Line Items]                
Drawings from non-revolving term senior unsecured equity bridge credit facility $ 404 CAD 535,000,000