Litigation and other contingencies (Tables)

12 Months Ended

Dec. 31, 2013

Schedule of Unconditional Purchase Obligations

	Payments due by period
millions of dollars	2014		2015		2016		2017		2018		After 2018		Total
Unconditional purchase obligations (a)		91		80		82		83		84		237		657

(a) 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.