Summary of Significant Accounting Policies (Tables)

3 Months Ended

Mar. 31, 2016

Accounting Policies [Abstract]

Non-Cash Write-Downs of Carrying Value of Proved Oil and Gas Properties by Country

The following tables present non-cash write-downs of the carrying value of the Company’s proved oil and gas properties by country for the first quarters of 2016 and 2015:

	For the Quarter Ended March 31, 2016				For the Quarter Ended March 31, 2015
	Before tax		After tax		Before tax		After tax
	(In millions)
U.S.	$	—	$	—	$	5,235	$	3,377
Canada	—		—		1,353		1,011
North Sea	325		162		632		316
Egypt	163		163		—		—
Total write-downs	$	488	$	325	$	7,220	$	4,704