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SHARE CAPITAL - Stock Option Activity (Details)
shares in Thousands
 12 Months Ended
Dec. 31, 2018
CAD ($)
shares
Dec. 31, 2017
CAD ($)
shares
Share Capital, Reserves And Other Equity Interest [Abstract]    
Stock options outstanding - beginning of year (in shares) | shares 56,036 58,299
Stock options granted (in shares) | shares 4,256 16,052
Stock options surrendered for cash settlement (in shares) | shares (392) (626)
Stock options exercised for common shares (in shares) | shares (9,975) (14,256)
Stock options forfeited (in shares) | shares (3,240) (3,433)
Stock options outstanding - end of year (in shares) | shares 46,685 56,036
Stock options exercisable (in shares) | shares 19,436 18,282
Weighted average exercise price, options outstanding - beginning of year (in CAD per share) | $ $ 36.67 $ 34.22
Weighted average exercise price, options granted (in CAD per share) | $ 43.75 42.07
Weighted average exercise price, options surrendered for cash settlement (in CAD per share) | $ 33.46 33.18
Weighted average exercise price, options exercised (in CAD per share) | $ 33.28 32.66
Weighted average exercise price, options forfeited (in CAD per share) | $ 38.76 37.53
Weighted average exercise price, options outstanding - end of year (in CAD per share) | $ 37.92 36.67
Weighted average exercise price, options exercisable (in CAD per share) | $ $ 36.03 $ 34.25