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Share Capital - Stock Option Activity (Details)
shares in Thousands
 12 Months Ended
Dec. 31, 2022
shares
$ / shares
Dec. 31, 2021
shares
$ / shares
Share Capital, Reserves And Other Equity Interest [Abstract]    
Stock options outstanding - beginning of year (in shares) | shares 38,327 48,656
Stock options granted (in shares) | shares 7,547 12,547
Stock options exercised for common shares (in shares) | shares (11,605) (18,147)
Stock options surrendered for cash settlement (in shares) | shares (441) (1,324)
Stock options forfeited (in shares) | shares (2,678) (3,405)
Stock options outstanding - end of year (in shares) | shares 31,150 38,327
Stock options exercisable (in shares) | shares 5,522 7,841
Weighted average exercise price, options outstanding - beginning of year (in CAD per share) | $ / shares $ 35.88 $ 37.53
Weighted average exercise price, options granted (in CAD per share) | $ / shares 68.15 34.39
Weighted average exercise price, options exercised (in CAD per share) | $ / shares 38.06 38.97
Weighted average exercise price, options surrendered for cash settlement (in CAD per share) | $ / shares 38.43 40.54
Weighted average exercise price, options forfeited (in CAD per share) | $ / shares 41.43 35.73
Weighted average exercise price, options outstanding - beginning of year (in CAD per share) | $ / shares 42.37 35.88
Weighted average exercise price, options exercisable (in CAD per share) | $ / shares $ 37.60 $ 39.19