Summary of Significant Accounting Policies (Tables)

3 Months Ended

Mar. 31, 2017

Accounting Policies [Abstract]

Schedule of Non-cash Impairments of Proved and Unproved Property and Equipment

The following table represents non-cash impairments of the carrying value of the Company’s proved and unproved property and equipment for the first quarters of 2017 and 2016:

	Quarter Ended March 31,
	2017		2016
	(In millions)
Oil and Gas Property:
Proved	$	—	$	—
Unproved	15		42