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SHARE CAPITAL - Range of Exercise Prices of Stock Options (Details) shares in Thousands | Dec. 31, 2017 CAD ($) shares year | Dec. 31, 2016 CAD ($) shares | Dec. 31, 2015 CAD ($) shares
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Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Stock options outstanding (in shares) | shares | 56,036 | 58,299 | 74,615
Weighted average remaining term (years) | year | 3.13 |  |
Weighted average exercise price, options outstanding (in CAD per share) | $ 36.67 | $ 34.22 | $ 34.88
Stock options exercisable (in shares) | shares | 18,282 | 20,747 |
Weighted average exercise price, options exercisable (in CAD per share) | $ 34.25 | $ 33.75 |
$22.90 - $24.99 |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Stock options outstanding (in shares) | shares | 3,657 |  |
Weighted average remaining term (years) | year | 3.03 |  |
Weighted average exercise price, options outstanding (in CAD per share) | $ 22.90 |  |
Stock options exercisable (in shares) | shares | 1,116 |  |
Weighted average exercise price, options exercisable (in CAD per share) | $ 22.90 |  |
$22.90 - $24.99 | Bottom of range |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Range of exercise prices | 22.90 |  |
$22.90 - $24.99 | Top of range |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Range of exercise prices | $ 24.99 |  |
$25.00 - $29.99 |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Stock options outstanding (in shares) | shares | 8,390 |  |
Weighted average remaining term (years) | year | 2.34 |  |
Weighted average exercise price, options outstanding (in CAD per share) | $ 28.72 |  |
Stock options exercisable (in shares) | shares | 3,967 |  |
Weighted average exercise price, options exercisable (in CAD per share) | $ 28.57 |  |
$25.00 - $29.99 | Bottom of range |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Range of exercise prices | 25.00 |  |
$25.00 - $29.99 | Top of range |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Range of exercise prices | $ 29.99 |  |
$30.00 - $34.99 |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Stock options outstanding (in shares) | shares | 10,047 |  |
Weighted average remaining term (years) | year | 1.61 |  |
Weighted average exercise price, options outstanding (in CAD per share) | $ 33.31 |  |
Stock options exercisable (in shares) | shares | 5,557 |  |
Weighted average exercise price, options exercisable (in CAD per share) | $ 33.49 |  |
$30.00 - $34.99 | Bottom of range |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Range of exercise prices | 30.00 |  |
$30.00 - $34.99 | Top of range |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Range of exercise prices | $ 34.99 |  |
$35.00 - $39.99 |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Stock options outstanding (in shares) | shares | 13,523 |  |
Weighted average remaining term (years) | year | 3.29 |  |
Weighted average exercise price, options outstanding (in CAD per share) | $ 37.21 |  |
Stock options exercisable (in shares) | shares | 4,190 |  |
Weighted average exercise price, options exercisable (in CAD per share) | $ 35.88 |  |
$35.00 - $39.99 | Bottom of range |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Range of exercise prices | 35.00 |  |
$35.00 - $39.99 | Top of range |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Range of exercise prices | $ 39.99 |  |
$40.00 - $44.99 |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Stock options outstanding (in shares) | shares | 19,417 |  |
Weighted average remaining term (years) | year | 4.15 |  |
Weighted average exercise price, options outstanding (in CAD per share) | $ 43.60 |  |
Stock options exercisable (in shares) | shares | 3,118 |  |
Weighted average exercise price, options exercisable (in CAD per share) | $ 43.55 |  |
$40.00 - $44.99 | Bottom of range |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Range of exercise prices | 40.00 |  |
$40.00 - $44.99 | Top of range |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Range of exercise prices | $ 44.99 |  |
$45.00 - $46.74 |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Stock options outstanding (in shares) | shares | 1,002 |  |
Weighted average remaining term (years) | year | 3.63 |  |
Weighted average exercise price, options outstanding (in CAD per share) | $ 45.61 |  |
Stock options exercisable (in shares) | shares | 334 |  |
Weighted average exercise price, options exercisable (in CAD per share) | $ 45.09 |  |
$45.00 - $46.74 | Bottom of range |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Range of exercise prices | 45.00 |  |
$45.00 - $46.74 | Top of range |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Range of exercise prices | $ 46.74 |  |

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