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Share Capital - Stock Option Activity (Details)
shares in Thousands
 12 Months Ended
Dec. 31, 2020
shares
$ / shares
Dec. 31, 2019
shares
$ / shares
Share Capital, Reserves And Other Equity Interest [Abstract]    
Stock options outstanding - beginning of year (in shares) | shares 47,646 46,685
Stock options granted (in shares) | shares 12,032 16,314
Stock options surrendered for cash settlement (in shares) | shares (3,979) (10,871)
Stock options exercised for common shares (in shares) | shares (757) (1,003)
Stock options forfeited (in shares) | shares (6,286) (3,479)
Stock options outstanding - end of year (in shares) | shares 48,656 47,646
Stock options exercisable (in shares) | shares 17,970 17,057
Weighted average exercise price, options outstanding - beginning of year (in CAD per share) | $ / shares $ 38.04 $ 37.92
Weighted average exercise price, options granted (in CAD per share) | $ / shares 32.89 34.84
Weighted average exercise price, options surrendered for cash settlement (in CAD per share) | $ / shares 27.24 33.16
Weighted average exercise price, options exercised (in CAD per share) | $ / shares 29.34 34.52
Weighted average exercise price, options forfeited (in CAD per share) | $ / shares 39.65 37.65
Weighted average exercise price, options outstanding - beginning of year (in CAD per share) | $ / shares 37.53 38.04
Weighted average exercise price, options exercisable (in CAD per share) | $ / shares $ 39.59 $ 38.74