Properties and Equipment (Tables)

12 Months Ended

Dec. 31, 2013

Table Text Block [Abstract]

Cost of Properties and Equipment by Segment Table

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

millions	2013		2012
Oil and gas exploration and production (1)	$	61,302	$	55,180
Midstream	7,285		6,032
Marketing	9		9
Other	2,648		2,377
Total	$	71,244	$	63,598

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⁽¹⁾  Includes costs associated with unproved properties of $6.9 billion at December 31, 2013, and $7.1 billion at December 31, 2012.