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Stock Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2016
Stock-Based Compensation [Abstract] |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value [Table Text Block] |
For the year ended December 31, | 2016 | 2015
Weighted average fair value per option | $ | 2.80 | $ | 2.66
Expected term |  | 5 years |  | 5 years
Risk-free interest rate |  | 0.66 | % |  | 0.73 | %
Expected dividend yield |  | 4.08 | % |  | 3.65 | %
Expected volatility |  | 15.45 | % |  | 14.58 | %
Schedule of Stock Options Roll Forward [Table Text Block] |
| Total Options |  | Non-Vested Options(1)
| Number of Options | Weighted average exercise price per share |  | Number of Options | Weighted average grant date fair-value
Outstanding as at December 31, 2015 | 2,927,068 | $ | 33.07 |  | 1,453,486 | $ | 2.64
Granted | 615,100 |  | 46.19 |  | 615,100 |  | 2.80
Exercised | (622,168) |  | 25.65 |  | N/A |  | N/A
Forfeited | - |  | - |  | (548,461) |  | 2.68
Options outstanding December 31, 2016 | 2,920,000 | $ | 37.42 |  | 1,520,125 | $ | 2.69
Options exercisable December 31, 2016 (2)(3) | 1,399,875 | $ | 33.35 |  |  |  |
(1) As at December 31, 2016 there was $3 million of unrecognized compensation related to stock options not yet vested which is expected to be recognized over a weighted average period of approximately 2.4 years (2015 - $3 million, 2.3 years).
(2) As at December 31, 2016, the weighted average remaining term of vested options was 5.7 years with an aggregate intrinsic value of $17 million (2015 - 5.3 years, $21 million).
(3) As at December 31, 2016 the fair value of options that vested in the year was $2 million (2015 - $1 million).
Schedule of Unvested Restricted Stock Units Roll Forward [Table Text Block] |
| Employee DSU |  | Weighted Average Grant Date Fair Value | Director DSU |  | Weighted Average Grant Date Fair Value
Outstanding as at December 31, 2015 | 606,646 | $ | 26.27 | 362,750 | $ | 31.36
Granted including DRIP | 74,855 |  | 37.60 | 69,429 |  | 43.67
Exercised | (570) |  | 46.58 | (36,381) |  | 27.42
Outstanding and exercisable as at December 31, 2016 | 680,931 | $ | 27.50 | 395,798 | $ | 33.88
| Employee PSU |  | Weighted Average Grant Date Fair Value |  | Aggregate intrinsic value
Outstanding as at December 31, 2015 | 497,496 | $ | 34.50 | $ | 21.5
Granted including DRIP | 280,950 |  | 40.60 |  |
Exercised | (208,999) |  | 34.39 |  |
Forfeited | (8,567) |  | 37.54 |  |
Outstanding as at December 31, 2016 | 560,880 | $ | 37.55 | $ | 25.5

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- Definition Tabular disclosure of the weighted-average grant-date fair value of equity options or other equity instruments granted during the year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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