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Litigation and other contingencies (Tables)
12 Months Ended
Dec. 31, 2014
Schedule of Unconditional Purchase Obligations
  Payments due by period  

millions of dollars

2015   2016   2017   2018   2019   After
2019
  Total  

Unconditional purchase obligations (a)

  100      84      85      88      99      225      681   
  (a) 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.