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FINANCIAL STATEMENT EFFECTS OF RATE REGULATION (Details) (CAD) In Millions, unless otherwise specified | 1 Months Ended | 12 Months Ended
--- | --- | ---
Nov. 30, 2012 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
GENERAL INFORMATION ON RATE REGULATION AND ITS EFFECTS |  |  |  |
Amount of OPEB costs permitted to be recovered as per the rate order received from the OEB |  | 89 |  |
Term for collection of OPEB costs in rates commencing from 2013 |  | 20 years |  |
Amount written off, net of tax, presented as an extraordinary loss |  |  | 262 |
Canadian Mainline |  |  |  |
GENERAL INFORMATION ON RATE REGULATION AND ITS EFFECTS |  |  |  |
Regulatory assets |  | 470 |  |
Southern Lights |  |  |  |
GENERAL INFORMATION ON RATE REGULATION AND ITS EFFECTS |  |  |  |
Term of transportation contracts |  | 15 years |  |
After-tax ROE (as a percent) |  | 10.00% |  |
Percentage of debt |  | 70.00% |  |
Percentage of equity |  | 30.00% |  |
Enbridge Gas Distribution |  |  |  |
GENERAL INFORMATION ON RATE REGULATION AND ITS EFFECTS |  |  |  |
After-tax ROE (as a percent) |  | 8.40% | 8.40% | 8.40%
Percentage of equity |  | 36.00% | 36.00% | 36.00%
Amount of OPEB costs permitted to be recovered as per the rate order received from the OEB | 89 |  |  |
Amount of OPEB costs after tax, permitted to be recovered as per the rate order received from the OEB | 63 |  |  |
Term for collection of OPEB costs in rates commencing from 2013 |  | 20 years |  |
Enbridge Gas New Brunswick |  |  |  |
GENERAL INFORMATION ON RATE REGULATION AND ITS EFFECTS |  |  |  |
Deferred regulatory asset written off |  |  | 180 |
Regulatory asset written off with respect to capitalized operating costs |  |  | 103 |
Amount of income tax recovery of regulatory asset written off with respect to capitalized operating costs |  |  | 21 |
Amount written off, net of tax, presented as an extraordinary loss |  |  | 262 |

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- Definition Represents the amount of costs permitted to be recovered under the defined benefit plan, after tax, as per the rate order received from the OEB. + References No definition available. + Details
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- Definition The amount for the individual regulatory asset as itemized in a table of regulatory assets as of the end of the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 71 -Paragraph 9, 10 -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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 340 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6499975&loc=d3e44250-110382 + Details
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