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Share Capital (Tables) | 12 Months Ended
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Dec. 31, 2019
Share Capital, Reserves And Other Equity Interest [Abstract] |
Summary of outstanding common stock |
|  | 2019 |  | 2018
Issued Common shares |  | Number of shares (thousands) |  |  | Amount |  |  | Number of shares (thousands) |  |  | Amount |
Balance – beginning of year |  | 1,201,886 |  |  | $ | 9,323 |  |  | 1,222,769 |  |  | $ | 9,109 |
Issued upon exercise of stock options |  | 10,871 |  |  | 360 |  |  | 9,975 |  |  | 332 |
Previously recognized liability on stock options exercised for common shares |  | — |  |  | 53 |  |  | — |  |  | 120 |
Purchase of common shares under Normal Course Issuer Bid |  | (25,900 | ) |  | (203 | ) |  | (30,858 | ) |  | (238 | )
Balance – end of year |  | 1,186,857 |  |  | $ | 9,533 |  |  | 1,201,886 |  |  | $ | 9,323 |
Summary of stock option activity | The following table summarizes information relating to stock options outstanding at December 31, 2019 and 2018:
|  | 2019 |  | 2018
|  | Stock options (thousands) |  |  | Weighted average exercise price |  |  | Stock options (thousands) |  |  | Weighted average exercise price |
Outstanding – beginning of year |  | 46,685 |  |  | $ | 37.92 |  |  | 56,036 |  |  | $ | 36.67 |
Granted |  | 16,314 |  |  | $ | 34.84 |  |  | 4,256 |  |  | $ | 43.75 |
Surrendered for cash settlement |  | (1,003 | ) |  | $ | 34.52 |  |  | (392 | ) |  | $ | 33.46 |
Exercised for common shares |  | (10,871 | ) |  | $ | 33.16 |  |  | (9,975 | ) |  | $ | 33.28 |
Forfeited |  | (3,479 | ) |  | $ | 37.65 |  |  | (3,240 | ) |  | $ | 38.76 |
Outstanding – end of year |  | 47,646 |  |  | $ | 38.04 |  |  | 46,685 |  |  | $ | 37.92 |
Exercisable – end of year |  | 17,057 |  |  | $ | 38.74 |  |  | 19,436 |  |  | $ | 36.03 |
Summary of range of exercise prices of stock options outstanding | The range of exercise prices of stock options outstanding and exercisable at December 31, 2019 was as follows:
|  |  |  | Stock options outstanding |  | Stock options exercisable
Range of exercise prices | Stock options outstanding (thousands) |  |  | Weighted average remaining term (years) |  | Weighted average exercise price |  |  | Stock options exercisable (thousands) |  |  | Weighted average exercise price |
$22.90 | - | $24.99 |  | 2,361 |  |  | 1.03 |  | $ | 22.90 |  |  | 1,579 |  |  | $ | 22.90 |
$25.00 | - | $29.99 |  | 3,524 |  |  | 1.04 |  | $ | 28.85 |  |  | 2,236 |  |  | $ | 28.85 |
$30.00 | - | $34.99 |  | 5,174 |  |  | 4.97 |  | $ | 32.38 |  |  | 536 |  |  | $ | 32.58 |
$35.00 | - | $39.99 |  | 16,635 |  |  | 3.91 |  | $ | 36.85 |  |  | 2,263 |  |  | $ | 37.62 |
$40.00 | - | $44.99 |  | 16,117 |  |  | 2.24 |  | $ | 43.60 |  |  | 8,939 |  |  | $ | 43.58 |
$45.00 | - | $46.74 |  | 3,835 |  |  | 3.06 |  | $ | 45.20 |  |  | 1,504 |  |  | $ | 45.13 |
|  |  |  | 47,646 |  |  | 3.04 |  | $ | 38.04 |  |  | 17,057 |  |  | $ | 38.74 |

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