Exploratory Costs (Tables)

9 Months Ended

Sep. 30, 2016

Exploratory Cost Disclosure [Abstract]

Capitalized exploratory well and project activity

The following table reflects the Company's capitalized exploratory well and project activity during the three and nine months ended September 30, 2016:

	Three Months Ended September 30, 2016			Nine Months Ended September 30, 2016
	(in millions)
Beginning capitalized exploratory costs	$	357		$	306
Additions to exploratory costs pending the determination of proved reserves	328			991
Reclassification due to determination of proved reserves	(286		)	(898		)
Exploratory well costs charged to exploration expense	(1		)	(1		)
Ending capitalized exploratory costs	$	398		$	398

Capitalized Exploratory Costs And The Number Of Projects For Which Exploratory Costs Have Been Capitalized

The following table provides an aging, as of September 30, 2016 and December 31, 2015 of capitalized exploratory costs and the number of projects for which exploratory well costs have been capitalized for a period greater than one year, based on the date drilling was completed:

	September 30, 2016		December 31, 2015
	(in millions, except well counts)
Capitalized exploratory well costs that have been suspended:
One year or less	$	396	$	303
More than one year	2		3
	$	398	$	306
Number of wells or projects with exploratory well costs that have been suspended for a period greater than one year	1		1