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Suspended Exploratory Well Costs (Tables)
 12 Months Ended
Dec. 31, 2015
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. Additions pending the determination of proved reserves excludes amounts capitalized and subsequently charged to expense within the same year.
millions
2015
 
2014
 
2013
Balance at January 1
$
1,522

 
$
2,232

 
$
2,062

Additions pending the determination of proved reserves
461

 
421

 
848

Divestitures and other (1)
(33
)
 
(913
)
 
(48
)
Reclassifications to proved properties
(104
)
 
(100
)
 
(507
)
Charges to exploration expense (2)
(722
)
 
(118
)
 
(123
)
Balance at December 31
$
1,124

 
$
1,522

 
$
2,232


__________________________________________________________________
(1) 
Includes $(744) million during 2014 related to the Company’s sale of a 10% working interest in Offshore Area 1 in Mozambique.
(2) 
Includes $(565) million during 2015 related to Brazil. Given the current oil-price environment and other considerations, the Company does not expect to have substantive exploration and development activities in Brazil in the foreseeable future.
Schedule of Aging of Suspended Exploratory Well Costs
The following provides an aging of suspended well balances at December 31:
millions
2015
 
2014
 
2013
Exploratory well costs capitalized for a period of one year or less
$
452

 
$
393

 
$
836

Exploratory well costs capitalized for a period greater than one year
672

 
1,129

 
1,396

Balance at December 31
$
1,124

 
$
1,522

 
$
2,232


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, 2015:
millions except projects
Number of Projects
 
Total
 
2014
 
2013
 
2012 and
prior
United States—Onshore
18
 
$
55

 
$
34

 
$
11

 
$
10

United States—Offshore
4
 
314

 
77

 
80

 
157

International
7
 
303

 
119

 
3

 
181

 
29
 
$
672

 
$
230

 
$
94

 
$
348