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Common Stock (Common Stock Rollfoward) (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Increase (Decrease) In Common Stock Shares [Roll Forward]    
Balance, January 1 210,020,000 147,210,000
Conversion of Convertible Debentures 150,000 51,990,000
Issuance of common stock 14,610,000 7,690,000
Issued for cash under Purchase Plans at market rate 3,890,000 2,510,000
Discount on shares purchased under Dividend Reinvestment Plan 0 0
Options exercised under senior management share option plan 100,000 620,000
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period 0 0
Balance, December 31 228,770,000 210,020,000
Increase (Decrease) In Common Stock Value [Roll Forward]    
Common Stock, Value, Issued, Beginning Balance $ 4,738 $ 2,157
Conversion of Convertible Debentures 6 2,115
Issuance of common shares 680 338
Issued for cash under Purchase Plans at market rate 182 115
Discount on shares purchased under Dividend Reinvestment Plan Value (9) (5)
Options exercised under senior management share option plan 3 17
Stock-based compensation 1 1
Common Stock, Value, Issued, Ending Balance $ 5,601 $ 4,738
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 (103,825)  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Common Stock, Capital Shares Reserved for Future Issuance 1,300,000 1,500,000
Stock Compensation Plan [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Common Stock, Capital Shares Reserved for Future Issuance 6,500,000 6,600,000
Dividend Reinvestment [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Common Stock, Capital Shares Reserved for Future Issuance 4,200,000 7,900,000