XML 89 R35.htm IDEA: XBRL DOCUMENT v2.4.0.6
Properties and Equipment (Tables)
 12 Months Ended
Dec. 31, 2012
Table Text Block [Abstract]  
Summary of the Cost of Properties and Equipment by Segment Table
      
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
      

____________________________________________________________________

 

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