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Share-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2017
Share based compensation |
Share-Based compensation expense |
($ millions) |  | 2017 |  | 2016 |
Equity-settled plans |  | 48 |  | 48 |
Cash-settled plans |  | 334 |  | 395 |
Total share-based compensation expense |  | 382 |  | 443 |
Summary of liability recognized for share-based compensation |
($ millions) |  | 2017 |  | 2016 |
Current Liability |  | 344 |  | 359 |
Long-Term Liability (note 23) |  | 361 |  | 364 |
Total Liability |  | 705 |  | 723 |
Weighted average fair value of options granted during the period and the weighted average assumptions used in their determination |
|  | 2017 |  | 2016 |
Annual dividend per share |  | $ 1.28 |  | $ 1.16 |
Risk-free interest rate |  | 1.09% |  | 0.55% |
Expected life |  | 5 years |  | 5 years |
Expected volatility |  | 25% |  | 28% |
Weighted average fair value per option |  | $ 6.42 |  | $ 4.60 |
Summary of stock option plans |
|  | 2017 |  | 2016 |
|  | Number (thousands) |  | Weighted Average Exercise Price ($) |  | Number (thousands) |  | Weighted Average Exercise Price ($) |
Outstanding, beginning of year |  | 31 442 |  | 35.98 |  | 29 090 |  | 36.97 |
Granted |  | 7 401 |  | 42.04 |  | 8 145 |  | 30.26 |
Exercised for cash payment |  | (6 | ) | 32.00 |  | (1 441 | ) | 30.39 |
Exercised as options for common shares |  | (6 223 | ) | 36.65 |  | (3 983 | ) | 33.36 |
Forfeited/expired |  | (1 504 | ) | 42.21 |  | (369 | ) | 38.12 |
Outstanding, end of year |  | 31 110 |  | 36.96 |  | 31 442 |  | 35.98 |
Exercisable, end of year |  | 17 363 |  | 36.53 |  | 17 821 |  | 37.74 |
Exercise price ranges and weighted average remaining contractual lives | For the options outstanding at December 31, 2017, the exercise price ranges and weighted average remaining contractual lives are shown below:
|  | Outstanding |  | Exercisable |
Exercise Prices ($) |  | Number (thousands) |  | Weighted Average Remaining Contractual Life (years) |  | Weighted Average exercise price ($) |  | Number (thousands) |  | Weighted Average exercise price ($) |
24.50-34.99 |  | 11 466 |  | 4 |  | 31.32 |  | 6 714 |  | 32.07 |
35.00-39.99 |  | 9 987 |  | 4 |  | 37.72 |  | 8 006 |  | 37.44 |
40.00-44.99 |  | 8 347 |  | 5 |  | 41.99 |  | 1 333 |  | 41.70 |
45.00-49.99 |  | 1 197 |  | 0 |  | 47.52 |  | 1 197 |  | 47.52 |
50.00-69.97 |  | 113 |  | 0 |  | 59.54 |  | 113 |  | 59.54 |
Total |  | 31 110 |  | 4 |  | 36.96 |  | 17 363 |  | 36.53 |
Summary of common shares available for granting future options |
(thousands) |  | 2017 |  | 2016 |
|  | 28 972 |  | 10 937 |
Summary of share units and stock appreciation rights |
(thousands) |  | PSU |  | RSU |  | DSU |  |
Outstanding, December 31, 2015 |  | 2 465 |  | 19 104 |  | 1 072 |  |
| Granted |  | 1 683 |  | 6 194 |  | 186 |  |
| Redeemed for cash |  | (1 714 | ) | (6 649 | ) | (40 | ) |
| Forfeited/expired |  | (21 | ) | (491 | ) | — |  |
Outstanding, December 31, 2016 |  | 2 413 |  | 18 158 |  | 1 218 |  |
| Granted |  | 1 570 |  | 5 009 |  | 202 |  |
| Redeemed for cash |  | (1 663 | ) | (6 354 | ) | (118 | ) |
| Forfeited/expired |  | (53 | ) | (741 | ) | — |  |
Outstanding, December 31, 2017 |  | 2 267 |  | 16 072 |  | 1 302 |  |
Stock Appreciation Rights (SARs) |
Share based compensation |
Summary of share units and stock appreciation rights |
|  | 2017 |  | 2016 |
|  | Number (thousands) |  | Weighted Average Exercise Price ($) |  | Number (thousands) |  | Weighted Average Exercise Price ($) |
Outstanding, beginning of year |  | 485 |  | 34.90 |  | 957 |  | 27.98 |
Granted |  | 107 |  | 42.05 |  | 142 |  | 30.23 |
Exercised |  | (176 | ) | 35.59 |  | (610 | ) | 23.07 |
Forfeited/expired |  | (29 | ) | 37.32 |  | (4 | ) | 19.44 |
Outstanding, end of year |  | 387 |  | 36.38 |  | 485 |  | 34.90 |
Exercisable, end of year |  | 162 |  | 35.39 |  | 240 |  | 36.29 |

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