Capitalized Exploratory Well Costs (Tables)

9 Months Ended

Sep. 30, 2018

Capitalized Exploratory Well Costs [Abstract]

Net Changes in Capitalized Exploratory Well Costs

The following table discloses the net changes in capitalized exploratory well costs pending determination of proved reserves during the nine months ended September 30, 2018 (in millions):

Balance at January 1, 2018	$	304
Additions to capitalized exploratory well costs pending the determination of proved reserves		102
Capitalized exploratory well costs charged to expense		(13	)
Balance at September 30, 2018	$	393