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Common Stock (Common Stock Rollfoward) (Details) - CAD
CAD in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Increase (Decrease) In Common Stock Shares [Roll Forward]    
Balance, January 1 147,210,000 143,780,000
Conversion of Convertible Debentures 51,990,000 0
Issued for cash under Purchase Plans at market rate 2,510,000 2,100,000
Discount on shares purchased under Dividend Reinvestment Plan 0 0
Options exercised under senior management share option plan 620,000 80,000
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period 0 0
Balance, December 31 210,020,000 147,210,000
Increase (Decrease) In Common Stock Value [Roll Forward]    
Common Stock, Value, Issued, Beginning Balance CAD 2,157,000 CAD 2,016,000
Conversion of Convertible Debentures 2,115,000 0
Issued for cash under Purchase Plans at market rate 115,000 88,000
Discount on shares purchased under Dividend Reinvestment Plan Value (5,000) (4,000)
Options exercised under senior management share option plan 17,000 2,000
Stock-based compensation 1,000 1,000
Common Stock, Value, Issued, Ending Balance CAD 4,738,000 CAD 2,157,000
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Share-based Compensation Arrangement by Share-based Payment Award, Percentage of Outstanding Stock Maximum 10.00%  
Employee Stock Option [Member]    
Increase (Decrease) In Common Stock Shares [Roll Forward]    
Options exercised under senior management share option plan (622,168)  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Common Stock, Capital Shares Reserved for Future Issuance 1,500,000 1,600,000
Stock Compensation Plan [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Common Stock, Capital Shares Reserved for Future Issuance 6,600,000 7,300,000
Dividend Reinvestment [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Common Stock, Capital Shares Reserved for Future Issuance 7,900,000 3,300,000