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STOCK OPTION AND STOCK UNIT PLANS - PERFORMANCE STOCK UNITS (Details) shares in Thousands, CAD in Millions | 12 Months Ended
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Dec. 31, 2015 CAD item shares | Dec. 31, 2014 CAD shares
PERFORMANCE STOCK UNITS |  |
STOCK OPTION AND STOCK UNIT PLANS |  |
Period of performance cycle | 3 years |
Period prior to the maturity of the grant for which weighted average share price is used to calculate cash awards | 20 days |
Performance multiplier | item | 2 |
Outstanding stock units |  |
Units outstanding at beginning of year (in shares) | 555 |
Units granted (in shares) | 244 |
Units cancelled (in shares) | (9) |
Units matured (in shares) | (282) |
Dividend reinvestment (in shares) | 28 |
Units outstanding at end of year (in shares) | 536 | 555
Weighted Average Remaining Contractual Life (years) |  |
Units outstanding at end of year | 1 year 6 months |
Aggregate Intrinsic Value |  |
Units outstanding at end of year (in Canadian dollars) | CAD | CAD 47 |
Stock units, additional disclosures |  |
Total amount paid (in Canadian dollars) | CAD | 35 | CAD 36
Compensation expense (in Canadian dollars) | CAD | 12 | CAD 40
Unrecognized compensation expense related to non-vested units granted (in Canadian dollars) | CAD | CAD 28 |
Weighted average period over which compensation cost is expected to be recognized |  | 2 years
PERFORMANCE STOCK UNITS | Minimum |  |
STOCK OPTION AND STOCK UNIT PLANS |  |
Performance multiplier | item | 0 |
PERFORMANCE STOCK UNITS | Maximum |  |
STOCK OPTION AND STOCK UNIT PLANS |  |
Performance multiplier | item | 2 |
Restricted stock units |  |
STOCK OPTION AND STOCK UNIT PLANS |  |
Maturity period | 35 months |
Period prior to the maturity of the grant for which weighted average share price is used to calculate cash awards | 20 days |
Outstanding stock units |  |
Units outstanding at beginning of year (in shares) | 1,959 |
Units granted (in shares) | 854 |
Units cancelled (in shares) | (101) |
Units matured (in shares) | (904) |
Dividend reinvestment (in shares) | 98 |
Units outstanding at end of year (in shares) | 1,906 | 1,959
Weighted Average Remaining Contractual Life (years) |  |
Units outstanding at end of year | 1 year 4 months 24 days |
Aggregate Intrinsic Value |  |
Units outstanding at end of year (in Canadian dollars) | CAD | CAD 88 |
Stock units, additional disclosures |  |
Total amount paid (in Canadian dollars) | CAD | 45 | CAD 45
Compensation expense (in Canadian dollars) | CAD | 47 | CAD 44
Unrecognized compensation expense related to non-vested units granted (in Canadian dollars) | CAD | CAD 64 |
Weighted average period over which compensation cost is expected to be recognized |  | 1 year

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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 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F + Details
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