Goodwill (Tables)

12 Months Ended

Dec. 31, 2015

Goodwill And Intangible Assets Disclosure [Abstract]

Changes in Carrying Amount of Goodwill

The changes in the carrying amount of goodwill were as follows:

	Exploration and Production			Bakken Midstream		Total
	(In millions)
Beginning balance at January 1, 2014	$	1,869		$	—	$	1,869
Acquisitions		115			—		115
Dispositions		(126	)		—		(126	)
Balance at December 31, 2014		1,858			—		1,858
Reclassification		(375	)		375		—
Impairment		(1,483	)		—		(1,483	)
Ending balance at December 31, 2015	$	—		$	375	$	375