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Property, Plant and Equipment
 12 Months Ended
Dec. 31, 2017
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment
Property, Plant and Equipment
 
December 31,
(In millions)
2017
 
2016
United States E&P
$
15,867

 
$
14,158

International E&P
1,710

 
2,470

Corporate
88

 
99

Net property, plant and equipment
$
17,665

 
$
16,727


At December 31, 2017, 2016 and 2015 we had total deferred exploratory well costs as follows:
 
December 31,
(In millions)
2017
 
2016
 
2015
Amounts capitalized less than one year after completion of drilling
$
263

 
$
131

 
$
352

Amounts capitalized greater than one year after completion of drilling
32

 
118

 
85

Total deferred exploratory well costs
$
295

 
$
249

 
$
437

Number of projects with costs capitalized greater than one year after
 
 
 
 
 
completion of drilling
1

 
3

 
2

 
 
 
 
 
 
 
 
(In millions)
2017
 
2016
 
2015
Beginning balance
$
249

 
$
437

 
$
573

Additions
212

 
299

 
610

Charges to expense (a)
(64
)
 
(23
)
 
(111
)
Transfers to development
(102
)
 
(388
)
 
(635
)
Dispositions(b)
—

 
(76
)
 
—

Ending balance
$
295

 
$
249

 
$
437


(a) 
Includes $64 million in exploratory well costs being expensed as a result of our agreement to sell Diaba License G4-223 in the Republic of Gabon in August of 2017. See Note 10 for further detail.
(b) 
Includes sale of GOM assets in 2016.

Exploratory well costs capitalized greater than one year after completion of drilling are associated with one project in E.G. with costs of $32 million as of December 31, 2017. Management believes this project with suspended exploratory drilling costs exhibit sufficient quantities of hydrocarbons to justify potential development based on current plans. For this project in E.G., drilling was completed on the Rodo well in Alba Block Sub Area B, offshore E. G. in the first quarter of 2015, and we have since completed a seismic feasibility study. In 2017, we received approval for and proceeded to perform a seismic reprocessing program. After completion of this program we will evaluate drilling opportunities within Sub Area B.