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Schedule of Unconditional Purchase Obligations (Detail) (CAD) In Millions, unless otherwise specified	Dec. 31, 2014
Unrecorded Unconditional Purchase Obligation [Line Items]
Unconditional purchase obligations payments due 2015	100us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnFirstAnniversary	[1]
Unconditional purchase obligations payments due 2016	84us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnSecondAnniversary	[1]
Unconditional purchase obligations payments due 2017	85us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnThirdAnniversary	[1]
Unconditional purchase obligations payments due 2018	88us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnFourthAnniversary	[1]
Unconditional purchase obligations payments due 2019	99us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnFifthAnniversary	[1]
Unconditional purchase obligations payments due after 2019	225us-gaap_UnrecordedUnconditionalPurchaseObligationDueAfterFiveYears	[1]
Unconditional Purchase Obligation, Total	681us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceSheetAmount	[1]
[1] Undiscounted obligations of $681 million mainly pertain to pipeline throughput agreements. Total payments under unconditional purchase obligations were $112 million (2013 - $95 million, 2012 - $86 million). The present value of these commitments, excluding imputed interest of $125 million, totalled $556 million.

X

- Definition

Amount of the fixed and determinable portion of the unrecorded unconditional purchase obligation maturing in the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 440

-SubTopic 10

-Section 50

-Paragraph 4

-Subparagraph (b)

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- Definition

Amount of the fixed and determinable portion of the unrecorded unconditional purchase obligation maturing in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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- Definition

Amount of the fixed and determinable portion of the unrecorded unconditional purchase obligation maturing in the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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-Section 50

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Amount of the fixed and determinable portion of the unrecorded unconditional purchase obligation maturing in the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

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Amount of the fixed and determinable portion of the unrecorded unconditional purchase obligation maturing in the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of the unrecorded obligation to transfer funds in the future for fixed or minimum amounts or quantities of goods or services at fixed or minimum prices (for example, as in take-or-pay contracts or throughput contracts).

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Amount of the fixed and determinable portion of the unrecorded unconditional purchase obligation maturing after the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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