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COMMON SHARES - Options (Details)	12 Months Ended
	Dec. 31, 2019 $ / shares shares
Number of Options (thousands)
Outstanding at the beginning of the period (in shares)	12,404,000
Granted (in shares)	2,004,000
Exercised (in shares)	(5,138,000)
Options forfeited/expired (in shares)	(176,000)
Outstanding at the end of the period (in shares)	9,094,000
Options Exercisable (in shares)	5,110,000
Weighted Average Exercise Prices
Outstanding at the beginning of the period (in Canadian dollars per share) | $ / shares	$ 52.83
Granted (in Canadian dollars per share) | $ / shares	56.90
Exercised (in Canadian dollars per share) | $ / shares	49.08
Options forfeited/expired (in Canadian dollars per share) | $ / shares	56.69
Outstanding at the end of the period (in Canadian dollars per share) | $ / shares	55.77
Options Exercisable at December 31, 2017 (in Canadian dollars per share) | $ / shares	$ 54.28
Weighted Average Remaining Contractual Life (years)
Options Outstanding	4 years 1 month 6 days
Options Exercisable	3 years
Number of shares available for grant (in shares)	7,962,761
Options expiration term	7 years
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	3 years
Vesting in year one
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting rights percentage	33.33%
Vesting in year two
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting rights percentage	33.33%
Vesting in year three
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting rights percentage	33.34%

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The period of time, from the grant date until the time at which the share-based (option) award expires.

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Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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Weighted average price of options that were either forfeited or expired.

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Gross number of share options (or share units) granted during the period.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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Weighted average remaining contractual term of exercisable stock options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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