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)	Nine Months Ended September 30, 2014
Capitalized Exploratory Well Costs, Beginning of Period	$	1,301
Additions to Capitalized Exploratory Well Costs Pending Determination of Proved Reserves	274
Reclassified to Proved Oil and Gas Properties Based on Determination of Proved Reserves or to Assets Held for Sale	(186		)
Capitalized Exploratory Well Costs Charged to Expense ⁽¹⁾	(85		)
Capitalized Exploratory Well Costs, End of Period	$	1,304

⁽¹⁾Capitalized exploratory wells costs charged to expense primarily represent the Scotia exploratory well, offshore Falkland Islands, which was determined to be non-commercial.

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)	September 30, 2014		December 31, 2013
Exploratory Well Costs Capitalized for a Period of One Year or Less	$	307	$	568
Exploratory Well Costs Capitalized for a Period Greater Than One Year Since Commencement of Drilling	997		733
Balance at End of Period	$	1,304	$	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 September 30, 2014:



			Suspended Since
(millions)	Total		2012 - 2013		2010 - 2011		2009 & Prior		Progress
Country/Project:
Deepwater Gulf of Mexico
Troubadour	$	44	$	44	$	—	$	—	Evaluating development scenarios for this 2013 natural gas discovery
Offshore Equatorial Guinea
Diega (including Carmen)	161		56		52		53		Evaluating regional development scenarios for this 2008 crude oil discovery
Carla	150		138		12		—		Evaluating regional development scenarios for this 2011 crude oil discovery
Felicita	38		3		6		29		Evaluating regional development plans for this 2008 condensate and natural gas discovery
Yolanda	19		2		3		14		Evaluating regional development plans for this 2007 condensate and natural gas discovery
Offshore Cameroon
YoYo	47		4		9		34		Working with the government to assess commercialization of this 2007 condensate and natural gas discovery
Offshore Israel
Leviathan	181		71		110		—		Submitted a development plan to the Israeli government; finalizing front-end engineering and design (FEED) work; continuing marketing activities with potential natural gas customers
Leviathan-1 Deep	77		50		27		—		Well did not reach the target interval; developing future drilling plans to test this deep oil concept
Dalit	26		4		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	25		3		22		—		Reviewing regional development scenarios for this 2011 natural gas discovery
Offshore Cyprus
Cyprus	188		131		57		—		Discussing monetization options with the Cyprus government for this 2011 natural gas discovery
Other
Projects less than $20 million	41		31		4		6		Continuing to drill and evaluate wells
Total	$	997	$	537	$	304	$	156