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Share Capital (Tables) | 12 Months Ended
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Dec. 31, 2021
Share Capital, Reserves And Other Equity Interest [Abstract] |
Summary of outstanding common stock |
|  | 2021 |  | 2020
Issued Common Shares |  | Number of shares (thousands) |  | Amount |  | Number of shares (thousands) |  | Amount
Balance – beginning of year |  | 1,183,866 |  |  | $ | 9,606 |  |  | 1,186,857 |  |  | $ | 9,533 |
Issued upon exercise of stock options |  | 18,147 |  |  | 707 |  |  | 3,979 |  |  | 108 |
Previously recognized liability on stock options exercised for common shares |  | — |  |  | 139 |  |  | — |  |  | 21 |
Purchase of common shares under Normal Course Issuer Bid |  | (33,644) |  |  | (284) |  |  | (6,970) |  |  | (56) |
Balance – end of year |  | 1,168,369 |  |  | $ | 10,168 |  |  | 1,183,866 |  |  | $ | 9,606 |
Summary of stock option activity | The following table summarizes information relating to stock options outstanding at December 31, 2021 and 2020:
|  | 2021 |  | 2020
|  | Stock options (thousands) |  | Weighted average exercise price |  | Stock options (thousands) |  | Weighted average exercise price
Outstanding – beginning of year |  | 48,656 |  |  | $ | 37.53 |  |  | 47,646 |  |  | $ | 38.04 |
Granted |  | 12,547 |  |  | $ | 34.39 |  |  | 12,032 |  |  | $ | 32.89 |
Exercised for common shares |  | (18,147) |  |  | $ | 38.97 |  |  | (3,979) |  |  | $ | 27.24 |
Surrendered for cash settlement |  | (1,324) |  |  | $ | 40.54 |  |  | (757) |  |  | $ | 29.34 |
Forfeited |  | (3,405) |  |  | $ | 35.73 |  |  | (6,286) |  |  | $ | 39.65 |
Outstanding – end of year |  | 38,327 |  |  | $ | 35.88 |  |  | 48,656 |  |  | $ | 37.53 |
Exercisable – end of year |  | 7,841 |  |  | $ | 39.19 |  |  | 17,970 |  |  | $ | 39.59 |
Summary of range of exercise prices of stock options outstanding | The range of exercise prices of stock options outstanding and exercisable at December 31, 2021 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
$20.76 | – | $24.99 |  | 2,697 |  |  | 3.31 |  | $ | 20.95 |  |  | 566 |  |  | $ | 20.76 |
$25.00 | – | $29.99 |  | 7,526 |  |  | 4.21 |  | $ | 29.21 |  |  | 1 |  |  | $ | 28.63 |
$30.00 | – | $34.99 |  | 2,726 |  |  | 3.58 |  | $ | 32.37 |  |  | 219 |  |  | $ | 32.56 |
$35.00 | – | $39.99 |  | 15,227 |  |  | 2.59 |  | $ | 37.46 |  |  | 3,148 |  |  | $ | 37.34 |
$40.00 | – | $44.99 |  | 7,679 |  |  | 2.74 |  | $ | 42.04 |  |  | 2,894 |  |  | $ | 43.23 |
$45.00 | – | $49.99 |  | 1,839 |  |  | 1.42 |  | $ | 45.19 |  |  | 1,013 |  |  | $ | 45.14 |
$50.00 | – | $54.24 |  | 633 |  |  | 5.83 |  | $ | 54.24 |  |  | — |  |  | $ | — |
|  |  |  | 38,327 |  |  | 3.06 |  | $ | 35.88 |  |  | 7,841 |  |  | $ | 39.19 |

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