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Inventories
3 Months Ended
Mar. 31, 2013
Disclosure Text Block [Abstract]  
Inventories

2.  Inventories

 

       The following summarizes the major classes of inventories included in other current assets:

 March 31, December 31,
millions2013 2012
Crude oil$58 $91
Natural gas 16  48
NGLs 44  37
Total$118 $176