Summary of Significant Accounting Policies (Tables)

9 Months Ended

Sep. 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 third quarters and first nine months of 2016 and 2015:

	Quarter Ended September 30,				Nine Months Ended September 30,
	2016		2015		2016		2015
	(In millions)
Oil and Gas Property:
Proved	$	355	$	3,536	$	423	$	5,797
Unproved	114		199		222		515