Long Term Debt (Detail) (CAD) In Millions, unless otherwise specified	Dec. 31, 2013		Dec. 31, 2012
Debt Instrument [Line Items]
Long-term debt	4,316	[1]	1,040	[1]
Capital leases	128	[2]	135	[2]
Total long-term debt	4,444	[3]	1,175	[3]

[1] Borrowed under an existing agreement with an affiliated company of ExxonMobil that provides for a long-term, variable-rate loan from ExxonMobil to the company of up to $5 billion (Canadian) at interest equivalent to Canadian market rates. The agreement is effective until July 31, 2020, cancelable if ExxonMobil provides at least 370 days advance written notice. Average effective rate for the loan was 1.3 percent in 2013.

[2] Capitalized lease obligations primarily relate to capital leases for pipeline transportation and marine services agreements. The average imputed rate was 7.0 percent in 2013 (2012 - 9.6 percent). Total capitalized lease obligations also include $7 million in current liabilities (2012 - $7 million). Principal payments on capital leases of approximately $7 million per year are due in each of the next four years after December 31, 2014.

[3] Long-term debt includes amounts to related parties of $4,316 million (2012 - $1,040 million).