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Property, Plant and Equipment
 12 Months Ended
Dec. 31, 2018
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment
Property, Plant and Equipment
 
December 31,
(In millions)
2018
 
2017
United States
$
16,011

 
$
15,867

International(a)
710

 
1,710

Corporate
83

 
88

Net property, plant and equipment
$
16,804

 
$
17,665


(a) Decrease in 2018 is primarily the result of the sale of our Libya subsidiary in 2018, see Note 5 for further detail.
At December 31, 2018, 2017 and 2016 we had total deferred exploratory well costs as follows:
 
December 31,
(In millions)
2018
 
2017
 
2016
Amounts capitalized less than one year after completion of drilling
$
297

 
$
263

 
$
131

Amounts capitalized greater than one year after completion of drilling
—

 
32

 
118

Total deferred exploratory well costs
$
297

 
$
295

 
$
249

Number of projects with costs capitalized greater than one year after
completion of drilling
—

 
1

 
3

 
 
 
 
 
 
 
 
(In millions)
2018
 
2017
 
2016
Beginning balance
$
295

 
$
249

 
$
437

Additions
262

 
212

 
299

Charges to expense(a)
(35
)
 
(64
)
 
(23
)
Transfers to development
(197
)
 
(102
)
 
(388
)
Dispositions(b)
(28
)
 
—

 
(76
)
Ending balance
$
297

 
$
295

 
$
249


(a) 
2018 includes $32 million related to the Rodo well in Alba Block Sub Area B, offshore E.G. 2017 includes $64 million as a result of our agreement to sell Diaba License G4-223 in the Republic of Gabon (see Note 11 for further detail).
(b) 
Includes the sale of our Libya subsidiary in 2018 and GOM assets in 2016.
We had no exploratory well costs capitalized greater than one year as of December 31, 2018 and $32 million as of December 31, 2017. During the fourth quarter 2018, we concluded our evaluation of drilling opportunities on the Rodo well in Alba Block Sub Area B, offshore E.G. and determined that we would not pursue further activity. As a result, $32 million in exploratory well costs were expensed.