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Litigation And Other Contingencies (Tables)
 12 Months Ended
Dec. 31, 2011
Litigation And Other Contingencies [Abstract]  
Schedule Of Unconditional Purchase Obligations
Payments due by period  
millions of dollars    2012      2013      2014      2015      2016      After
2016		      Total  

Unconditional purchase obligations (a)

     48         40         40         39         39         163         369   
(a) Undiscounted obligations of $369 million mainly pertain to pipeline throughput agreements. Total payments under unconditional purchase obligations were $73 million (2010 - $78 million, 2009 - $74 million). The present value of these commitments, excluding imputed interest of $83 million, totaled $286 million.