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Properties and Equipment
 12 Months Ended
Dec. 31, 2018
Property, Plant and Equipment, Gross [Abstract]  
Properties and Equipment
5. Properties and Equipment
The following summarizes properties and equipment at December 31:
millions
2018

 
2017

Exploration and Production (1)
$
52,796

 
$
50,221

WES Midstream
11,259

 
8,980

Other
2,465

 
2,357

Gross properties and equipment
$
66,520

 
$
61,558

Less accumulated DD&A
37,905

 
34,107

Net properties and equipment
$
28,615

 
$
27,451

(1) 
Includes costs associated with unproved properties of $1.7 billion at December 31, 2018, and $2.4 billion at December 31, 2017.