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Variable Interest Entity (Details) - CAD
CAD in Millions
 1 Months Ended 12 Months Ended
Apr. 30, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
ASSETS        
Cash and cash equivalents   CAD 269 CAD 242 CAD 230
Accounts receivable and other current assets   1,127 964  
Utility capital assets   29,337 19,595  
Intangible assets   1,011 541  
Total assets   47,904 28,804  
Liabilities [Abstract]        
Accounts payable and other current liabilities   (1,970) (1,419)  
Other liabilities   (1,279) (1,152)  
Total liabilities   (31,454) (18,451)  
Net earnings        
Revenue   6,838 6,757  
Expenses        
Operating   2,031 1,874  
Depreciation and amortization   983 873  
Finance charges   678 553  
Net earnings (loss)   713 840  
Gross capital expenditures   2,061 2,243  
Dividends paid to non-controlling interests   53 23  
Advances from non-controlling interests   CAD 1,361 20  
Waneta Partnership        
Variable Interest Entity [Line Items]        
Controlling ownership interest (percent)   51.00%    
Noncontrolling ownership (percent)   49.00%    
Variable Interest Entity | Waneta Partnership        
Variable Interest Entity [Line Items]        
Controlling ownership interest (percent)   51.00%    
Noncontrolling ownership (percent)   49.00%    
General partner ownership (percent)   0.01%    
Long-term contract for electric power, term 40 years      
ASSETS        
Cash and cash equivalents   CAD 15 23  
Accounts receivable and other current assets   14 14  
Utility capital assets   696 708  
Intangible assets   30 30  
Total assets   755 775  
Liabilities [Abstract]        
Accounts payable and other current liabilities   (3) (18)  
Other liabilities   (79) (74)  
Total liabilities   (82) (92)  
Net assets before partners’ equity   673 683  
Net earnings        
Revenue   91 70  
Expenses        
Operating   17 10  
Depreciation and amortization   18 14  
Finance charges   3 2  
Total operating expenses   38 26  
Net earnings (loss)   53 44  
Gross capital expenditures   18 32  
Dividends paid to non-controlling interests   CAD 31 11  
Advances from non-controlling interests     CAD 9