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Suspended Exploratory Well Costs (Tables)

12 Months Ended

Dec. 31, 2012

Suspended Exploratory Well Costs Roll Forward


millions	2012		2011		2010
Balance at January 1	$	1,353	$	935	$	579
Additions pending the determination of proved reserves		960		572		491
Reclassifications to proved properties		(129)		(116)		(106)
Charges to exploration expense		(122)		(38)		(29)
Balance at December 31	$	2,062	$	1,353	$	935

Schedule of Aging of Suspended Exploratory Well Costs by Geographic Area


			Year Costs Incurred
									2009 and
millions	Total		2012⁽¹⁾		2011		2010		prior
United States—Onshore	$	136	$	123	$	3	$	—	$	10
United States—Offshore		392		158		(5)		61		178
International		1,534		636		396		314		188
	$	2,062	$	917	$	394	$	375	$	376

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

- Definition

Tabular disclosure of the amount of exploratory well costs that have been capitalized after the completion of drilling and the number of projects for which those costs relate. Additionally, for exploratory well costs that have been capitalized for periods greater than one year at the most recent balance sheet date, this block of text may be used to disclose an aging of those amounts by year, or by using a range of years, and the number of projects to which those costs relate.

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