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Capitalized Exploratory Well Costs (Tables)
 12 Months Ended
Dec. 31, 2013
Capitalized Exploratory Well Costs [Abstract]  
Changes in Capitalized Exploratory Well Costs
We capitalize exploratory well costs until a determination is made that the well has found proved reserves or is deemed noncommercial. If a well is deemed to be noncommercial, the well costs are immediately charged to exploration expense as dry hole cost.
Changes in capitalized exploratory well costs are as follows and exclude amounts that were capitalized and subsequently expensed in the same period:
 
Year Ended December 31,
(millions)
2013
 
2012
 
2011
Capitalized Exploratory Well Costs, Beginning of Period
$
900

 
$
696

 
$
466

Additions to Capitalized Exploratory Well Costs Pending Determination of Proved Reserves
581

 
360

 
322

Reclassified to Proved Oil and Gas Properties Based on Determination of Proved Reserves (1)
(177
)
 
(18
)
 
(55
)
Capitalized Exploratory Well Costs Charged to Expense (2)
(3
)
 
(114
)
 
(37
)
Other (3)
—

 
(24
)
 
—

Capitalized Exploratory Well Costs, End of Period
$
1,301

 
$
900

 
$
696

(1) 
The 2013 amount relates primarily to Gunflint (deepwater Gulf of Mexico), for which we sanctioned a development plan.
(2) 
The 2012 amount primarily represents Deep Blue (deepwater Gulf of Mexico) exploratory well costs capitalized prior to December 31, 2012.
(3) 
The 2012 amount relates to Selkirk (North Sea) exploratory well costs capitalized prior to December 31, 2012. See Note 3. Property Transactions
Aging of Capitalized Well Costs
The following table provides an aging of capitalized exploratory well costs based on the date that drilling commenced, and the number of projects that have been capitalized for a period greater than one year:
 
December 31,
(millions)
2013
 
2012
 
2011
Exploratory Well Costs Capitalized for a Period of One Year or Less
$
568

 
$
355

 
$
318

Exploratory Well Costs Capitalized for a Period Greater Than One Year Since Commencement of Drilling
733

 
545

 
378

Balance at End of Period
$
1,301

 
$
900

 
$
696

Number of Projects with Exploratory Well Costs That Have Been Capitalized for a Period Greater Than One Year Since Commencement of Drilling
13

 
14

 
13
Aging of Exploratory Well Costs
The following table provides a further aging of those exploratory well costs that have been capitalized for a period greater than one year since the commencement of drilling as of December 31, 2013:
 
 
 
Suspended Since
 
 
(millions)
Total
 
2011 - 2012
 
2009 - 2010
 
2008 & Prior
 
Progress
Country/Project:
 
 
 
 
 
 
 
 
 
Offshore Equatorial Guinea
 
 
 
 
 
 
 
 
 
Diega (including Carmen)
$
108

 
$
43

 
$
23

 
$
42

 
We are evaluating regional development scenarios for this 2008 crude oil discovery
Carla
44

 
44

 
—

 
—

 
We are evaluating regional development scenarios for this 2011 crude oil discovery
Felicita
37

 
2

 
6

 
29

 
We are evaluating regional development plans for this 2008 condensate and natural gas discovery
Yolanda
19

 
1

 
3

 
15

 
We are evaluating regional development plans for this 2007 condensate and natural gas discovery
Offshore Cameroon
 

 
 

 
 

 
 

 
 
YoYo
47

 
5

 
8

 
34

 
We are working with the government to assess commercialization of this 2007 condensate and natural gas discovery
Offshore Israel
 

 
 

 
 

 
 

 
 
Leviathan
144

 
97

 
47

 
—

 
We are evaluating both domestic and export development concepts for this 2010 natural gas discovery
Leviathan-1 Deep
73

 
73

 
—

 
—

 
The well did not reach the target interval; we are developing future drilling plans to test this deep oil concept
Dalit
24

 
1

 
23

 
—

 
We have submitted a development plan to the government to develop this 2009 natural gas discovery as a tie-in to existing infrastructure
Tanin 1
34

 
34

 
—

 
—

 
We are reviewing regional development scenarios for this 2011 natural gas discovery
Dolphin 1
23

 
23

 
—

 
—

 
We are reviewing regional development scenarios for this 2011 natural gas discovery
Offshore Cyprus
 
 
 
 
 
 
 
 
 
Cyprus A-1
74

 
74

 
—

 
—

 
We are continuing to drill and evaluate appraisal wells for this 2011 natural gas discovery
Falkland Islands
 

 
 

 
 

 
 

 
 
Scotia
72

 
72

 
—

 
—

 
We are evaluating future appraisal well locations and are in the process of acquiring seismic data
Other
 

 
 

 
 

 
 

 
 
Projects less than $10 million
34

 
29

 
5

 
—

 
We are continuing to drill and evaluate appraisal wells
Total
$
733

 
$
498

 
$
115

 
$
120