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SHARE CAPITAL - Stock Option Activity (Details)
shares in Thousands
 12 Months Ended
Dec. 31, 2017
CAD ($)
shares
Dec. 31, 2016
CAD ($)
shares
Share Capital, Reserves And Other Equity Interest [Abstract]    
Stock options outstanding - beginning of year (in shares) | shares 58,299 74,615
Stock options granted (in shares) | shares 16,052 11,002
Stock options surrendered for cash settlement (in shares) | shares (626) (817)
Stock options exercised for common shares (in shares) | shares (14,256) (16,284)
Stock options forfeited (in shares) | shares (3,433) (10,217)
Stock options outstanding - end of year (in shares) | shares 56,036 58,299
Stock options exercisable (in shares) | shares 18,282 20,747
Weighted average exercise price, options outstanding - beginning of year (in CAD per share) | $ $ 34.22 $ 34.88
Weighted average exercise price, options granted (in CAD per share) | $ 42.07 34.97
Weighted average exercise price, options surrendered for cash settlement (in CAD per share) | $ 33.18 34.47
Weighted average exercise price, options exercised (in CAD per share) | $ 32.66 34.31
Weighted average exercise price, options forfeited (in CAD per share) | $ 37.53 39.66
Weighted average exercise price, options outstanding - end of year (in CAD per share) | $ 36.67 34.22
Weighted average exercise price, options exercisable (in CAD per share) | $ $ 34.25 $ 33.75