XML 60 R12.htm IDEA: XBRL DOCUMENT v2.4.0.6
Inventories
9 Months Ended
Sep. 30, 2012
Disclosure Text Block [Abstract]  
Inventories

3.  Inventories

 

       The major classes of inventories, included in other current assets, are as follows:

 September 30, December 31,
millions2012 2011
Crude oil$76 $103
Natural gas 32  49
NGLs 42  59
Total$150 $211