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Suspended Exploratory Well Costs (Tables)
 12 Months Ended
Dec. 31, 2013
Table Text Block [Abstract]  
Suspended Exploratory Well Costs Roll Forward
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
2013
 
2012
 
2011
Balance at January 1
$
2,062

 
$
1,353

 
$
935

Additions pending the determination of proved reserves
848

 
960

 
572

Divestitures
(48
)
 
—

 
—

Reclassifications to proved properties
(507
)
 
(129
)
 
(116
)
Charges to exploration expense
(123
)
 
(122
)
 
(38
)
Balance at December 31
$
2,232

 
$
2,062

 
$
1,353
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, 2013:
 
 
 
Year Costs Incurred
millions
Total
 
2013(1)
 
2012
 
2011
 
2010 and
prior
United States—Onshore
$
160

 
$
143

 
$
6

 
$
1

 
$
10

United States—Offshore
461

 
126

 
137

 
24

 
174

International
1,611

 
442

 
526

 
303

 
340

 
$
2,232

 
$
711

 
$
669

 
$
328

 
$
524

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