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STOCK OPTION AND STOCK UNIT PLANS (Details 3) (CAD) In Millions, except Share data in Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2012 item | Dec. 31, 2011 | Dec. 31, 2010
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 | 2 |  |
Outstanding stock units |  |  |
Units outstanding at beginning of year (in shares) | 937 |  |
Units granted (in shares) | 307 |  |
Units matured (in shares) | (627) |  |
Dividend reinvestment (in shares) | 35 |  |
Units outstanding at end of year (in shares) | 652 | 937 |
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) | 56 |  |
Stock units, additional disclosures |  |  |
Total amount paid (in Canadian dollars) | 25 | 17 | 14
Compensation expense (in Canadian dollars) | 49 | 42 | 27
Unrecognized compensation expense related to non-vested units granted (in Canadian dollars) | 25 |  |
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 | 0 |  |
PERFORMANCE STOCK UNITS | Maximum |  |  |
STOCK OPTION AND STOCK UNIT PLANS |  |  |
Performance multiplier | 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) | 1,902 |  |
Units granted (in shares) | 891 |  |
Units cancelled (in shares) | (114) |  |
Units matured (in shares) | (939) |  |
Dividend reinvestment (in shares) | 79 |  |
Units outstanding at end of year (in shares) | 1,819 | 1,902 |
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) | 78 |  |
Stock units, additional disclosures |  |  |
Total amount paid (in Canadian dollars) | 37 | 39 | 24
Compensation expense (in Canadian dollars) | 32 | 31 | 29
Unrecognized compensation expense related to non-vested units granted (in Canadian dollars) | 37 |  |
Weighted average period over which compensation cost is expected to be recognized | 2 years |  |

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- Definition Represents the period prior to the maturity of the grant for which weighted average share price is used to calculate cash awards under the share-based compensation arrangement. + References No definition available. + Details
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- Definition Represents the increase in the number of shares under the equity instrument other than options due to dividend reinvestment. + References No definition available. + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that matured during the period. + References No definition available. + Details
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- Definition Represents the amount of difference between fair value of the underlying shares reserved for issuance and exercise price of awards outstanding on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan). + 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 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph g(1) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: 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 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph 64 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 6: 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=6793087&loc=d3e301413-122809 + Details
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + 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 (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph b(2)(c) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition Weighted average remaining contractual term for equity-based awards excluding options, 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 (e)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The liabilities paid during the accounting period for equity-based compensation. + 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 (d)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph c(2) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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