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 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:



(millions)	Three Months Ended March 31, 2014
Capitalized Exploratory Well Costs, Beginning of Period	$	1,301
Additions to Capitalized Exploratory Well Costs Pending Determination of Proved Reserves	72
Reclassified to Proved Oil and Gas Properties Based on Determination of Proved Reserves or to Assets Held for Sale	(76		)
Capitalized Exploratory Well Costs Charged to Expense	(2		)
Capitalized Exploratory Well Costs, End of Period	$	1,295

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:



(millions)	March 31, 2014		December 31, 2013
Exploratory Well Costs Capitalized for a Period of One Year or Less	$	465	$	568
Exploratory Well Costs Capitalized for a Period Greater Than One Year Since Commencement of Drilling	830		733
Balance at End of Period	$	1,295	$	1,301
Number of Projects with Exploratory Well Costs That Have Been Capitalized for a Period Greater Than One Year Since Commencement of Drilling	12		13

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 March 31, 2014:



			Suspended Since
(millions)	Total		2012 - 2013		2010 - 2011		2009 & Prior		Progress
Country/Project:
Offshore Equatorial Guinea
Diega (including Carmen)	$	106	$	1	$	52	$	53	Evaluating regional development scenarios for this 2008 crude oil discovery
Carla	123		111		12		—		Evaluating regional development scenarios for this 2011 crude oil discovery
Felicita	37		2		6		29		Evaluating regional development plans for this 2008 condensate and natural gas discovery
Yolanda	18		1		3		14		Evaluating regional development plans for this 2007 condensate and natural gas discovery
Offshore Cameroon
YoYo	46		3		9		34		Working with the government to assess commercialization of this 2007 condensate and natural gas discovery
Offshore Israel
Leviathan	176		66		110		—		Working to close a definitive farmout agreement and evaluating both domestic and export development concepts for this 2010 natural gas discovery. In addition, the Leviathan licenses were recently converted to Production and Development Leases.
Leviathan-1 Deep	75		48		27		—		Well did not reach the target interval; we are developing future drilling plans to test this deep oil concept
Dalit	24		2		2		20		Submitted a development plan to the government to develop this 2009 natural gas discovery as a tie-in to existing infrastructure
Dolphin 1	23		1		22		—		Reviewing regional development scenarios for this 2011 natural gas discovery
Offshore Cyprus
Cyprus A-1	79		22		57		—		Planning additional appraisal activities, including interpretation of seismic data and spudding another exploration well to further refine the ultimate recoverable resources and optimize field development planning.
Falkland Islands
Scotia	74		74		—		—		Preparing to analyze recently acquired seismic data
Other
Projects less than $10 million	49		39		4		6		Continuing to drill and evaluate appraisal wells
Total	$	830	$	370	$	304	$	156