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Suspended Exploratory Well Costs (Tables)
 12 Months Ended
Dec. 31, 2014
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
2014
 
2013
 
2012
Balance at January 1
$
2,232

 
$
2,062

 
$
1,353

Additions pending the determination of proved reserves
421

 
848

 
960

Divestitures (1)
(913
)
 
(48
)
 
—

Reclassifications to proved properties
(100
)
 
(507
)
 
(129
)
Charges to exploration expense
(118
)
 
(123
)
 
(122
)
Balance at December 31
$
1,522

 
$
2,232

 
$
2,062


__________________________________________________________________
(1) 
Includes $(744) million related to the Company’s sale of a 10% working interest in Offshore Area 1 in Mozambique during 2014.
Schedule of Aging of Suspended Exploratory Well Costs by Geographic Area
The following summarizes an aging of suspended exploratory well costs by geographic area and the year the costs were suspended at December 31, 2014:
 
 
 
Year Costs Incurred(1)
millions
Total
 
2014
 
2013
 
2012
 
2011 and
prior
United States—Onshore
$
164

 
$
131

 
$
17

 
$
5

 
$
11

United States—Offshore
314

 
78

 
80

 
63

 
93

International
1,044

 
179

 
271

 
184

 
410

 
$
1,522

 
$
388

 
$
368

 
$
252

 
$
514

__________________________________________________________________
(1) 
Excludes additions subsequently reclassified to proved properties within the same year