Summary of Significant Accounting Policies (Tables)

6 Months Ended

Jun. 30, 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 second quarters and first six months of 2016 and 2015:

	Quarter Ended June 30,				Six Months Ended June 30,
	2016		2015		2016		2015
	(In millions)
Oil and Gas Property:
Proved	$	68	$	349	$	68	$	2,261
Unproved	66		148		108		316