Property, Plant and Equipment (Tables)

6 Months Ended

Jun. 30, 2017

Capitalized Exploratory Well Costs [Abstract]

Net Changes in Capitalized Exploratory Well Costs

Capitalized Exploratory Well Costs:  The following table discloses the net changes in capitalized exploratory well costs pending determination of proved reserves during the six months ended June 30, 2017 (in millions):

Balance at January 1, 2017	$	597
Additions to capitalized exploratory well costs pending the determination of proved reserves		55
Reclassifications to wells, facilities and equipment based on the determination of proved reserves		(165	)
Balance at June 30, 2017	$	487