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RETIREMENT AND POSTRETIREMENT BENEFITS (Details 3) (CAD) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Effect of 1% change in assumed medical and dental care trend rate |  |  |
Increase in benefit obligation due to 1% increase in the assumed medical and dental care trend rate | 36 |  |
Increase in benefit and interest cost due to 1% increase in the assumed medical and dental care trend rate | 3 |  |
Decrease in benefit obligation due to 1% decrease in the assumed medical and dental care trend rate | 29 |  |
Decrease in benefit and interest cost due to 1% decrease in the assumed medical and dental care trend rate | 2 |  |
Expected Rate of Return on Plan Assets |  |  |
Expected return on plan assets (as a percent) | 6.00% |  |
Pension |  |  |
Expected Rate of Return on Plan Assets |  |  |
Expected return on plan assets (as a percent) | 7.10% | 7.30% | 7.30%
Major Categories of Plan Assets |  |  |
Carrying value of non-financial instruments | 59 | 77 |
Pension | Equity securities |  |  |
Major Categories of Plan Assets |  |  |
Percentage of plan assets invested in readily marketable investments | 59.10% | 56.70% |
Pension | Fixed income securities |  |  |
Major Categories of Plan Assets |  |  |
Percentage of plan assets invested in readily marketable investments | 32.40% | 36.60% |
Pension | Other |  |  |
Major Categories of Plan Assets |  |  |
Percentage of plan assets invested in readily marketable investments | 8.50% | 6.70% |
OPEB |  |  |
Expected Rate of Return on Plan Assets |  |  |
Expected return on plan assets (as a percent) | 6.00% | 6.00% | 6.00%
OPEB | Equity securities |  |  |
Major Categories of Plan Assets |  |  |
Percentage of plan assets invested in readily marketable investments | 58.10% | 55.30% |
OPEB | Fixed income securities |  |  |
Major Categories of Plan Assets |  |  |
Percentage of plan assets invested in readily marketable investments | 35.50% | 40.30% |
OPEB | Other |  |  |
Major Categories of Plan Assets |  |  |
Percentage of plan assets invested in readily marketable investments | 6.40% | 4.40% |
Canadian OPEB Plans | Drugs |  |  |
MEDICAL COST TRENDS |  |  |
Medical Cost Trend Rate Assumption for Next Fiscal Year (as a percent) | 8.60% |  |
Ultimate Medical Cost Trend Rate Assumption (as a percent) | 4.50% |  |
Canadian OPEB Plans | Other Medical and Dental |  |  |
MEDICAL COST TRENDS |  |  |
Medical Cost Trend Rate Assumption for Next Fiscal Year (as a percent) | 4.50% |  |
Ultimate Medical Cost Trend Rate Assumption (as a percent) | 4.50% |  |
United States OPEB Plan |  |  |
MEDICAL COST TRENDS |  |  |
Medical Cost Trend Rate Assumption for Next Fiscal Year (as a percent) | 7.60% |  |
Ultimate Medical Cost Trend Rate Assumption (as a percent) | 4.50% |  |
Canadian Plans |  |  |
Expected Rate of Return on Plan Assets |  |  |
Expected return on plan assets (as a percent) | 6.90% | 7.00% |
Liquids Pipelines Plan | Equity securities |  |  |
Target Mix for Plan Assets |  |  |
Allocation of plan assets (as a percent) | 62.50% |  |
Liquids Pipelines Plan | Fixed income securities |  |  |
Target Mix for Plan Assets |  |  |
Allocation of plan assets (as a percent) | 30.00% |  |
Liquids Pipelines Plan | Other |  |  |
Target Mix for Plan Assets |  |  |
Allocation of plan assets (as a percent) | 7.50% |  |
Gas Distribution Plan | Equity securities |  |  |
Target Mix for Plan Assets |  |  |
Allocation of plan assets (as a percent) | 53.50% |  |
Gas Distribution Plan | Fixed income securities |  |  |
Target Mix for Plan Assets |  |  |
Allocation of plan assets (as a percent) | 40.00% |  |
Gas Distribution Plan | Other |  |  |
Target Mix for Plan Assets |  |  |
Allocation of plan assets (as a percent) | 6.50% |  |
United States Plan |  |  |
Expected Rate of Return on Plan Assets |  |  |
Expected return on plan assets (as a percent) | 7.30% | 7.50% |
United States Plan | Equity securities |  |  |
Target Mix for Plan Assets |  |  |
Allocation of plan assets (as a percent) | 62.50% |  |
United States Plan | Fixed income securities |  |  |
Target Mix for Plan Assets |  |  |
Allocation of plan assets (as a percent) | 30.00% |  |
United States Plan | Other |  |  |
Target Mix for Plan Assets |  |  |
Allocation of plan assets (as a percent) | 7.50% |  |

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- Definition An assumption as to the rate of return on plan assets reflecting the average rate of earnings expected on the funds invested or to be invested to provide for the benefits included in the benefit obligation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(3) -URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 87 -Paragraph 264 -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 Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph j -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 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 30 -Glossary Expected Long-Term Rate of Return on Plan Assets -URI http://asc.fasb.org/extlink&oid=6512013 + Details
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- Definition Amount of effect of a one-percentage-point decrease in the assumed health care cost trend rates on the accumulated postretirement benefit obligation for health care benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (m) -URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e1928-114920 + Details
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- Definition Amount of effect of a one-percentage-point decrease in the assumed health care cost trend rates on the aggregate of the service and interest cost components of net periodic postretirement health care benefit costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (m) -URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e1928-114920 + Details
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- Definition The effect of a one-percentage-point increase in the assumed health care cost trend rates on the accumulated postretirement benefit obligation for health care benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (m) -URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph m -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 The effect of a one-percentage-point increase in the assumed health care cost trend rates on the aggregate of the service and interest cost components of net periodic postretirement health care benefit costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (m) -URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph m -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 The assumed health care cost trend rate for the next year used to measure the expected cost of benefits covered by the plan (gross eligible charges). This is based upon the annual rate of change in the cost of health care benefits currently provided by the postretirement benefit plan, due to factors other than changes in the composition of the plan population by age and dependency status. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (l) -URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph l -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 -Glossary Health Care Cost Trend Rate -URI http://asc.fasb.org/extlink&oid=6514820 + Details
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- Definition Percentage of fair value of investments (categorized by debt securities, equity securities, real estate and other plan assets) to the fair value of plan assets held. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e2446-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph d(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. + Details
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