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Schedule of Unconditional Purchase Obligations (Parenthetical) (Detail) (CAD) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Unrecorded Unconditional Purchase Obligation [Line Items] |  |  |  |
Undiscounted obligations mainly pertaining to pipeline throughput agreements | 657 | [1] |  |
Total payments under unconditional purchase obligations | 95 |  | 86 | 73
Imputed interest on commitments | 178 |  |  |
Total present value of commitments excluding imputed interest | 479 |  |  |
[1] | Undiscounted obligations of $657 million mainly pertain to pipeline throughput agreements. Total payments under unconditional purchase obligations were $95 million (2012 - $86 million, 2011 - $73 million). The present value of these commitments, excluding imputed interest of $178 million, totalled $479 million.

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- Definition 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). + 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) -URI http://asc.fasb.org/extlink&oid=6394976&loc=d3e25336-109308 + Details
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- Definition If disclosed, the amount of imputed interest necessary to reduce an unconditional purchase obligation to present value on an unrecorded unconditional purchase obligation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 440 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6394976&loc=d3e25376-109308 + Details
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- Definition The amount purchased during the period under an unrecorded unconditional purchase obligation (for example, under the take-or-pay or throughput contract). + 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 (d) -URI http://asc.fasb.org/extlink&oid=6394976&loc=d3e25336-109308 + Details
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