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CAPITALIZED EXPLORATORY WELL COSTS (Tables)
 12 Months Ended
Dec. 31, 2018
Extractive Industries [Abstract]  
Capitalized Exploratory Well Costs, Roll Forward
The following summarizes the changes in capitalized exploratory well costs for each of the last three years ended December 31, 2018, 2017, and 2016. Additions pending the determination of proved reserves excludes amounts capitalized and subsequently charged to expense within the same year.
 
 
2018
 
2017
 
2016
 
 
(In millions)
Balance at January 1
 
$
350

 
$
264

 
$
245

Additions pending determination of proved reserves
 
602

 
477

 
249

Divestitures and other
 
(82
)
 
(3
)
 
—

Reclassifications to proved properties
 
(647
)
 
(373
)
 
(211
)
Charged to exploration expense
 
(64
)
 
(15
)
 
(19
)
Balance at December 31
 
$
159

 
$
350

 
$
264
Schedule of Aging of Capitalized Exploratory Well Costs
The following provides an aging of capitalized exploratory well costs and the number of projects for which exploratory well costs have been capitalized for a period greater than one year since the completion of drilling:
 
 
2018
 
2017
 
2016
 
 
(In millions)
Exploratory well costs capitalized for a period of one year or less
 
$
126

 
$
160

 
$
119

Exploratory well costs capitalized for a period greater than one year
 
33

 
190

 
145

Balance at December 31
 
$
159

 
$
350

 
$
264

 
 
 
 
 
 
 
Number of projects with exploratory well costs capitalized for a period greater than one year
 
2

 
4

 
3
Schedule of Projects with Exploratory Well Costs Capitalized for More than One Year
The following summarizes a further aging by geographic area of those exploratory well costs that have been capitalized for a period greater than one year since the completion of drilling at December 31, 2018:
 
 
 
 
 
 
 
 
2015 and
 
 
Total
 
2017
 
2016
 
Prior
 
(In millions)
Suriname
 
28

 
—

 
—

 
28

Other Regions
 
5

 
5

 
—

 
—

 
 
$
33

 
$
5

 
$
—

 
$
28