Goodwill

The following table summarizes the changes in the carrying amount of Goodwill, by segment:



(in millions)	Defense and Intelligence		Civilian and Health Care		Total
Balance as of March 31, 2018	$	977	$	1,045	$	2,022
Additions	1,156		83		1,239
Allocations from DXC	11		—		11
Balance as of December 31, 2018	$	2,144	$	1,128	$	3,272

The additions to goodwill during nine months ended December 31, 2018 are due to the Mergers described in Note 4 – “Acquisitions.”

Goodwill Impairment Analysis

The Company tests goodwill for impairment on an annual basis, as of the first day of the second fiscal quarter, and between annual tests if circumstances change, or if an event occurs that would more likely than not reduce the fair value of a reporting unit below its carrying amount. The Company’s annual goodwill impairment analysis, which was performed qualitatively as of July 1, 2018, did not result in an impairment charge. This qualitative analysis under ASC Topic 350, Goodwill and Other Intangible Assets, considered all relevant factors specific to the reporting units, including macroeconomic conditions; industry and market considerations; overall financial performance and relevant entity-specific events.

At the end of the third quarter of fiscal year 2019, the Company assessed whether there were events or changes in circumstances that would more likely than not reduce the fair value of any of its reporting units below its carrying amount and require goodwill to be tested for impairment. The Company determined that there have been no such indicators, and, therefore, it was unnecessary to perform an interim goodwill impairment test as of December 31, 2018.