6. 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

In the second quarter of 2015, we established a new operating segment, the Bakken Midstream segment which had previously been reported as part of the Onshore reporting unit within the E&P operating segment. The E&P operating segment previously had two reporting units, Offshore which had allocated goodwill of $1,098 million and Onshore which had allocated goodwill of $760 million prior to forming the Bakken Midstream operating segment. Upon formation of the Bakken Midstream operating segment, we allocated $375 million of goodwill from the Onshore reporting unit to the Bakken Midstream operating segment based on the relative fair values of the Bakken Midstream business and the remainder of the Onshore reporting unit. There was no change to the composition of the Offshore reporting unit. See Note 10, Impairment for further information.

The acquired goodwill in 2014 resulted from the purchase of our partners’ 56% interest in WilcoHess, which was subsequently disposed of as part of the sale of our retail marketing operations. See Note 3, Discontinued Operations for further information.