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Suspended Exploratory Well Costs (Tables)
 12 Months Ended
Dec. 31, 2018
Capitalized Exploratory Well Costs [Abstract]  
Suspended Exploratory Well Costs Rollforward
The following summarizes the changes in suspended exploratory well costs at December 31 for each of the last three years:
millions
2018

 
2017

 
2016

Balance at January 1
$
525

 
$
1,230

 
$
1,124

Additions pending the determination of proved reserves (1)
90

 
349

 
490

Divestitures and other
(38
)
 
(36
)
 
(11
)
Reclassifications to proved properties
(132
)
 
(41
)
 
(50
)
Charges to exploration expense
(1
)
 
(977
)
 
(323
)
Balance at December 31
$
444

 
$
525

 
$
1,230


(1) 
Excludes amounts capitalized and subsequently charged to expense within the same year.
Schedule of Aging of Capitalized Exploratory Well Costs
The following provides an aging of suspended well balances at December 31:
millions
2018

 
2017

 
2016

Exploratory well costs capitalized for a period of one year or less
$
152

 
$
201

 
$
460

Exploratory well costs capitalized for a period greater than one year
292

 
324

 
770

Balance at December 31
$
444

 
$
525

 
$
1,230


7. Suspended Exploratory Well Costs (Continued)

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:
millions except projects
Number of Projects
 
Total

 
2017

 
2016

 
2015 and
prior

U.S. onshore
1
 
$
2

 
$
—

 
$
—

 
$
2

U.S. offshore
1
 
73

 
(1
)
 
74

 
—

International
3
 
217

 
11

 
14

 
192

 
5
 
$
292

 
$
10

 
$
88

 
$
194