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Properties and Equipment
 12 Months Ended
Dec. 31, 2017
Property, Plant and Equipment, Gross [Abstract]  
Properties and Equipment
4. Properties and Equipment
The following summarizes properties and equipment at December 31:
millions
2017
 
2016
Exploration and Production (1)
$
52,364

 
$
57,581

WES Midstream
7,871

 
6,862

Other Midstream
2,012

 
1,785

Other
2,803

 
2,785

Gross properties and equipment
$
65,050

 
$
69,013

Less accumulated DD&A
37,599

 
36,845

Net properties and equipment
$
27,451

 
$
32,168

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(1) 
Includes costs associated with unproved properties of $2.4 billion at December 31, 2017, and $4.1 billion at December 31, 2016.