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Share-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2018
Share based compensation |
Share-Based compensation expense |
($ millions) |  | 2018 |  | 2017 |
Equity-settled plans |  | 46 |  | 48 |
Cash-settled plans |  | 181 |  | 334 |
Total share-based compensation expense |  | 227 |  | 382 |
Summary of liability recognized for share-based compensation |
($ millions) |  | 2018 |  | 2017 |
Current liability |  | 286 |  | 344 |
Long-term liability (note 20) |  | 259 |  | 361 |
Total Liability |  | 545 |  | 705 |
Weighted average fair value of options granted during the period and the weighted average assumptions used in their determination |
|  | 2018 |  | 2017 |
Annual dividend per share |  | $ 1.44 |  | $ 1.28 |
Risk-free interest rate |  | 2.03% |  | 1.09% |
Expected life |  | 5 years |  | 5 years |
Expected volatility |  | 24% |  | 25% |
Weighted average fair value per option |  | $ 6.73 |  | $ 6.42 |
Summary of stock option plans |
|  | 2018 |  | 2017 |
|  | Number (thousands) |  | Weighted Average Exercise Price ($) |  | Number (thousands) |  | Weighted Average Exercise Price ($) |
Outstanding, beginning of year |  | 31 110 |  | 36.96 |  | 31 442 |  | 35.98 |
Granted |  | 7 231 |  | 43.19 |  | 7 401 |  | 42.04 |
Exercised for cash payment |  | — |  | — |  | (6 | ) | 32.00 |
Exercised as options for common shares |  | (7 927 | ) | 35.95 |  | (6 223 | ) | 36.65 |
Forfeited/expired |  | (1 479 | ) | 47.88 |  | (1 504 | ) | 42.21 |
Outstanding, end of year |  | 28 935 |  | 38.25 |  | 31 110 |  | 36.96 |
Exercisable, end of year |  | 15 374 |  | 36.10 |  | 17 363 |  | 36.53 |
Exercise price ranges and weighted average remaining contractual lives |
|  | Outstanding |  | Exercisable |
Exercise Prices ($) |  | Number (thousands) |  | Weighted Average Remaining Contractual Life (years) |  | Weighted Average Exercise Price ($) |  | Number (thousands) |  | Weighted Average Exercise Price ($) |
24.50-34.99 |  | 7 821 |  | 3 |  | 30.90 |  | 5 589 |  | 31.16 |
35.00-39.99 |  | 7 214 |  | 3 |  | 37.74 |  | 7 195 |  | 37.74 |
40.00-44.99 |  | 13 714 |  | 6 |  | 42.53 |  | 2 590 |  | 42.19 |
45.00-49.99 |  | 58 |  | 7 |  | 47.82 |  | — |  | — |
50.00-54.27 |  | 128 |  | 7 |  | 52.40 |  | — |  | — |
Total |  | 28 935 |  | 4 |  | 38.25 |  | 15 374 |  | 36.10 |
Summary of common shares available for granting future options |
(thousands) |  | 2018 |  | 2017 |
|  | 21 929 |  | 28 972 |
Summary of share units and stock appreciation rights |
(thousands) |  | PSU |  | RSU |  | DSU |  |
Outstanding, December 31, 2016 |  | 2 413 |  | 18 158 |  | 1 218 |  |
| Granted |  | 1 570 |  | 5 009 |  | 202 |  |
| Redeemed for cash |  | (1 663 | ) | (6 354 | ) | (118 | ) |
| Forfeited/expired |  | (53 | ) | (741 | ) | — |  |
Outstanding, December 31, 2017 |  | 2 267 |  | 16 072 |  | 1 302 |  |
| Granted |  | 1 553 |  | 4 796 |  | 192 |  |
| Redeemed for cash |  | (1 623 | ) | (5 962 | ) | (189 | ) |
| Forfeited/expired |  | — |  | (314 | ) | — |  |
Outstanding, December 31, 2018 |  | 2 197 |  | 14 592 |  | 1 305 |  |
Stock Appreciation Rights (SARs) |
Share based compensation |
Summary of share units and stock appreciation rights |
|  | 2018 |  | 2017 |
|  | Number (thousands) |  | Weighted Average Exercise Price ($) |  | Number (thousands) |  | Weighted Average Exercise Price ($) |
Outstanding, beginning of year |  | 387 |  | 36.38 |  | 485 |  | 34.90 |
Granted |  | 108 |  | 43.09 |  | 107 |  | 42.05 |
Exercised |  | (126 | ) | 35.65 |  | (176 | ) | 35.59 |
Forfeited/expired |  | (6 | ) | 38.36 |  | (29 | ) | 37.32 |
Outstanding, end of year |  | 363 |  | 38.60 |  | 387 |  | 36.38 |
Exercisable, end of year |  | 170 |  | 36.57 |  | 162 |  | 35.39 |

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