XML 82 R17.htm IDEA: XBRL DOCUMENT v2.4.0.6
Inventories
12 Months Ended
Dec. 31, 2012
Inventories [Abstract]  
Inventories

Note 9. Inventories

     December 31, December 31,
     2012 2011
          
      (Millions)
Natural gas liquids, olefins, and natural gas in underground storage  $ 97 $ 98
Materials, supplies, and other    78   71
     $ 175 $ 169