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Stock-based Compensation Plans - Directors' DSU Plan (Details)
CAD / shares in Units, CAD in Millions
 12 Months Ended
Dec. 31, 2016
CAD
CAD / shares
shares
Dec. 31, 2015
CAD
CAD / shares
shares
Number of DSUs    
Stock unit liabilities | CAD CAD 24 CAD 20
DSUs    
Number of DSUs    
Volume weighted average share price (period) 5 days  
Volume weighted average price, share price (in dollars per share) | CAD / shares   CAD 37.72
Director | DSUs    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Unit with underlying value equivalent to common shares 1  
Number of DSUs    
DSUs outstanding, beginning of year (shares) 167,762 176,124
Granted (shares) 30,165 28,737
Granted - notional dividends reinvested (shares) 6,994 7,037
DSUs paid out (shares) (5,510) (44,136)
DSUs outstanding, end of year (shares) 199,411 167,762
Non-employee expense recognized in earnings | CAD CAD 2 CAD 1
Awards paid (cad per share) | CAD / shares CAD 40.05  
Cash paid for award (less than $1 million) | CAD CAD 1  
Volume weighted average share price (period) 5 days  
Volume weighted average price, share price (in dollars per share) | CAD / shares CAD 41.46  
Stock unit liabilities | CAD CAD 8 CAD 6