XML 35 R11.htm IDEA: XBRL DOCUMENT v3.3.1.900
Properties and Equipment
 12 Months Ended
Dec. 31, 2015
Property, Plant and Equipment, Gross [Abstract]  
Properties and Equipment
4. Properties and Equipment
The following summarizes properties and equipment by segment at December 31:
millions
2015
 
2014
Oil and gas exploration and production (1)
$
59,389

 
$
63,674

Midstream
8,458

 
8,647

Other
2,836

 
2,786

Gross properties and equipment
$
70,683

 
$
75,107

Less accumulated depreciation, depletion, and amortization
36,932

 
33,518

Net properties and equipment
$
33,751

 
$
41,589

__________________________________________________________________
(1) 
Includes costs associated with unproved properties of $3.5 billion at December 31, 2015, and $5.1 billion at December 31, 2014.