Capitalized Exploratory Well Costs

9 Months Ended

Sep. 30, 2019

Extractive Industries [Abstract]

Capitalized Exploratory Well Costs

Capitalized Exploratory Well Costs

A summary of the changes in our capitalized well costs for the Current Period is detailed below. Additions pending the determination of proved reserves excludes amounts capitalized and subsequently charged to expense within the same year.

	2019
	($ in millions)
Balance as of January 1	$	36
Additions pending the determination of proved reserves	14
Divestitures and other	—
Reclassifications to proved properties	(18		)
Charges to exploration expense	(8		)
Balance as of September 30	$	24

As of September 30, 2019, approximately $1 million of drilling and completion costs on exploratory wells pending determination of proved reserves have been capitalized for greater than one year.