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Stock-based Compensation Plans - Directors' DSU Plan (Details) CAD / shares in Units, CAD in Millions | 12 Months Ended
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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

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