CAPITALIZED EXPLORATORY WELL COSTS (Tables)

12 Months Ended

Dec. 31, 2017

Capitalized Exploratory Well Costs, Roll Forward

The following summarizes the changes in capitalized exploratory well costs for each of the last three years ended December 31, 2017, 2016, and 2015. Additions pending the determination of proved reserves excludes amounts capitalized and subsequently charged to expense within the same year.



	2017			2016			2015
	(In millions)
Balance at January 1	$	264		$	245		$	849
Additions pending determination of proved reserves	477			249			382
Divestitures and other	(3		)	—			(557		)
Reclassifications to proved properties	(373		)	(211		)	(369		)
Charged to exploration expense	(15		)	(19		)	(60		)
Balance at December 31⁽¹⁾	$	350		$	264		$	245


(1)	Includes $2 million of assets related to the Canada divestiture at December 31, 2015.

Schedule of Aging of Capitalized Exploratory Well Costs

The following provides an aging of capitalized exploratory well costs and the number of projects for which exploratory well costs have been capitalized for a period greater than one year since the completion of drilling:



	2017		2016		2015
	(In millions)
Exploratory well costs capitalized for a period of one year or less	$	160	$	119	$	184
Exploratory well costs capitalized for a period greater than one year	190		145		61
Balance at December 31	$	350	$	264	$	245

Number of projects with exploratory well costs capitalized for a period greater than one year	4		3		2

Schedule of Projects with Exploratory Well Costs Capitalized for More than One Year

The following summarizes a further aging by geographic area of those exploratory well costs that have been capitalized for a period greater than one year since the completion of drilling at December 31, 2017:



							2014 and
	Total		2016		2015		Prior

North Sea	$	160	$	47	$	53	$	60
Other International	30		—		28		2
	$	190	$	47	$	81	$	62