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PROPERTY, PLANT AND EQUIPMENT
 12 Months Ended
Dec. 31, 2019
Property, Plant and Equipment [Abstract]  
PROPERTY, PLANT AND EQUIPMENT PROPERTY, PLANT AND EQUIPMENT

The carrying value of our PP&E represents the cost incurred to acquire or develop the asset, including any ARO and capitalized interest, net of accumulated DD&A and any impairment charges. For assets acquired, initial PP&E cost is based on fair values at the acquisition date. ARO are capitalized and recovered over the lives of the related assets. No impairment charges were recorded in 2019, 2018 or 2017.

Property, plant and equipment, net as of December 31, 2019 and 2018 consisted of the following:
 
2019
 
2018
 
(in millions)
Proved oil and natural gas properties
$
21,285

 
$
20,882

Unproved oil and natural gas properties(a)
1,055

 
1,103

Facilities and other
549

 
538

     Total property, plant and equipment
22,889

 
22,523

Accumulated depreciation, depletion and amortization
(16,537
)
 
(16,068
)
Total property, plant and equipment, net
$
6,352

 
$
6,455


(a)
Includes accumulated valuation allowance for total unproved properties of $823 million and $819 million at December 31, 2019 and 2018, respectively.

The following table summarizes the activity of capitalized exploratory well costs for the years ended December 31:
 
2019
 
2018
 
2017
 
(in millions)
Balance, beginning of year
$
5

 
$
4

 
$
4

Additions to capitalized exploratory well costs
12

 
19

 
4

Reclassification to property, plant and equipment
(3
)
 
(2
)
 
(2
)
Charged to expense
(7
)
 
(16
)
 
(2
)
Balance, end of year
$
7

 
$
5

 
$
4