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Other Long-Term Obligations (Parenthetical) (Detail) - CAD CAD in Millions	Jun. 30, 2016	Dec. 31, 2015
Schedule of Other Liabilities [Line Items]
Employee retirement benefits obligations in current liabilities	CAD 58	CAD 59
Asset retirement obligations and other environmental liabilities in current liabilities	CAD 117	CAD 116

X

- Definition

Asset Retirement Obligation And Other Environmental Liabilities Current

+ References

No definition available.

+ Details

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X

- Definition

Schedule of Other Liabilities [Line Items]

+ References

No definition available.

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X

- Definition

For a classified balance sheet, the amount recognized in balance sheet as a current liability associated with an underfunded defined benefit plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Current Liabilities
-URI http://asc.fasb.org/extlink&oid=6509677

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=64852052&loc=d3e1703-114919

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920

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