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STOCK OPTION AND STOCK UNIT PLANS - INCENTIVE STOCK OPTIONS (Details) CAD / shares in Units, CAD in Millions	12 Months Ended
	Dec. 31, 2015 CAD	Dec. 31, 2014 CAD	Dec. 31, 2015 $ / shares	Dec. 31, 2015 CAD CAD / shares	Dec. 31, 2014 $ / shares	Dec. 31, 2014 CAD / shares
INCENTIVE STOCK OPTIONS
Weighted average assumptions used to determine the fair value of options
Fair value per option (in Canadian or US dollars) | CAD / shares				CAD 6.48		CAD 5.53
Expected option term (in years)	5 years	5 years
Expected volatility (as a percent)	19.90%	16.90%
Expected dividend yield (as a percent)	3.20%	2.90%
Risk-free interest rate (as a percent)	0.90%	1.60%
Expected option term based on historical practice	6 years
Expected option term based on historical practice for retirement eligible employees	3 years
Compensation expense (in Canadian dollars)	CAD 35	CAD 29
Unrecognized compensation cost related to non-vested share-based compensation arrangements granted (in Canadian dollars)				CAD 47
Weighted average period over which compensation cost is expected to be recognized	2 years
INCENTIVE STOCK OPTIONS | Canadian employees
Weighted average assumptions used to determine the fair value of options
Fair value per option (in Canadian or US dollars) | CAD / shares				CAD 6.22		5.45
INCENTIVE STOCK OPTIONS | United States employees
Weighted average assumptions used to determine the fair value of options
Fair value per option (in Canadian or US dollars) | $ / shares			$ 6.16		$ 5.35
PERFORMANCE STOCK OPTIONS
Weighted average assumptions used to determine the fair value of options
Fair value per option (in Canadian or US dollars) | CAD / shares						CAD 5.77
Expected option term (in years)		6 years 6 months
Expected volatility (as a percent)		15.00%
Expected dividend yield (as a percent)		2.80%
Risk-free interest rate (as a percent)		1.70%
Compensation expense (in Canadian dollars)	CAD 3	CAD 3
Unrecognized compensation cost related to non-vested share-based compensation arrangements granted (in Canadian dollars)				CAD 5
Weighted average period over which compensation cost is expected to be recognized	2 years

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Expected term of share-based compensation awards, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days based on historical practice.

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Expected term of share-based compensation awards, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days based on historical practice for retirement eligible employees.

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Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Unrecognized cost of unvested options awarded to employees as compensation.

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Agreed-upon price for the exchange of the underlying asset relating to the share-based payment award.

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The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

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The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

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The risk-free interest rate assumption that is used in valuing an option on its own shares.

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