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STOCK OPTION AND STOCK UNIT PLANS - WEIGHTED AVERAGE ASSUMPTIONS (Details) CAD / shares in Units, CAD in Millions | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2016 CAD | Dec. 31, 2015 CAD CAD / shares | Dec. 31, 2014 CAD CAD / shares | Dec. 31, 2016 $ / shares | Dec. 31, 2016 CAD CAD / shares | Dec. 31, 2015 $ / shares | Dec. 31, 2014 $ / 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 |  | CAD 7.37 |  |
Expected option term (in years) | 5 years | 5 years | 5 years |  |  |  |
Expected volatility (as a percent) | 25.10% | 19.90% | 16.90% |  |  |  |
Expected dividend yield (as a percent) | 4.40% | 3.20% | 2.90% |  |  |  |
Risk-free interest rate (as a percent) | 0.80% | 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 43 | CAD 35 | CAD 29 |  |  |  |
Unrecognized compensation cost related to non-vested share-based compensation arrangements granted (in Canadian dollars) |  |  |  |  | CAD 50 |  |
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 | CAD 5.45 |  | CAD 7.01 |  |
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 |  |  |  | $ 6.60 |  | $ 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 | CAD 3 |  |  |  |
Unrecognized compensation cost related to non-vested share-based compensation arrangements granted (in Canadian dollars) |  |  |  |  | CAD 2 |  |
Weighted average period over which compensation cost is expected to be recognized | 1 year |  |  |  |  |  |

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- Definition 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. + References No definition available. + Details
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- Definition 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. + References No definition available. + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Agreed-upon price for the exchange of the underlying asset relating to the share-based payment award. + References No definition available. + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The risk-free interest rate assumption that is used in valuing an option on its own shares. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(iv) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.D.2) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 + Details
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