Summary of Significant Accounting Policies (Tables)

3 Months Ended

Mar. 31, 2016

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 2016 and 2015:

	Three months ended March 31,
	2016		2015
	(In millions)
Oil and Gas Property:
Proved	$	—	$	1,912
Unproved	42		168