Exploration Expense (Tables)

3 Months Ended

Mar. 31, 2020

Extractive Industries [Abstract]

Schedule of exploration expense

A summary of our exploration expense for the Current Quarter and the Prior Quarter is as follows:

	Three Months Ended March 31,
	2020		2019
	($ in millions)
Impairments of unproved properties	$	272	$	18
Dry hole expense	7		—
Geological and geophysical expense and other	3		6
Exploration expense	$	282	$	24