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Properties and Equipment
12 Months Ended
Dec. 31, 2012
Disclosure Text Block [Abstract]  
Properties and Equipment

5.  Properties and Equipment

 

       The following summarizes the cost of properties and equipment by segment at December 31:

      
millions2012 2011
Oil and gas exploration and production (1)$55,095 $52,711
Midstream 6,032  4,837
Marketing 94  9
Other 2,377  2,524
Total$63,598 $60,081
      

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(1)        Includes costs associated with unproved properties of $7.1 billion at December 31, 2012, and $8.3 billion at December 31, 2011.