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Share Capital - Stock Option Activity (Details)
shares in Thousands
 12 Months Ended
Dec. 31, 2019
shares
$ / shares
Dec. 31, 2018
shares
$ / shares
Share Capital, Reserves And Other Equity Interest [Abstract]    
Stock options outstanding - beginning of year (in shares) | shares 46,685 56,036
Stock options granted (in shares) | shares 16,314 4,256
Stock options surrendered for cash settlement (in shares) | shares (1,003) (392)
Stock options exercised for common shares (in shares) | shares (10,871) (9,975)
Stock options forfeited (in shares) | shares (3,479) (3,240)
Stock options outstanding - end of year (in shares) | shares 47,646 46,685
Stock options exercisable (in shares) | shares 17,057 19,436
Weighted average exercise price, options outstanding - beginning of year (in CAD per share) | $ / shares $ 37.92 $ 36.67
Weighted average exercise price, options granted (in CAD per share) | $ / shares 34.84 43.75
Weighted average exercise price, options surrendered for cash settlement (in CAD per share) | $ / shares 34.52 33.46
Weighted average exercise price, options exercised (in CAD per share) | $ / shares 33.16 33.28
Weighted average exercise price, options forfeited (in CAD per share) | $ / shares 37.65 38.76
Weighted average exercise price, options outstanding - beginning of year (in CAD per share) | $ / shares 38.04 37.92
Weighted average exercise price, options exercisable (in CAD per share) | $ / shares $ 38.74 $ 36.03