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Summary of Assets Acquired and Liabilities Assumed (Parenthetical) (Detail) (CAD) In Millions, unless otherwise specified | 1 Months Ended |  |  |
--- | --- | --- | --- | ---
Feb. 26, 2013 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Business Acquisition [Line Items] |  |  |  |
Risk adjusted discount rate | 10.00% |  |  |
Inflation rate | 2.00% |  |  |
Property, plant and equipment |  | 2,949 | 2,434 | 1,948
Asset retirement obligations |  | (287) | (284) | (267)
Other |  | (109) | (49) | (30)
Net deferred income tax liabilities |  | 2,512 | 1,397 | 850
Celtic |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Property, plant and equipment | 414 |  |  |
Total deferred income tax liabilities | 414 |  |  |
Asset retirement obligations | (17) |  |  |
Other | (20) |  |  |
Total deferred income tax assets | (37) |  |  |
Net deferred income tax liabilities | 377 |  |  |

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- Definition Amount of deferred tax liability attributable to taxable temporary differences. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Deferred Tax Liability -URI http://asc.fasb.org/extlink&oid=6510232 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 15 -Subparagraph b(2) -Article 7 + Details
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