Goodwill

The following table summarizes the changes in the carrying amount of Goodwill, by segment, as of September 30, 2018.



(in millions)	Defense and Intelligence		Civilian and Health Care		Total
Balance as of March 31, 2018	$	977	$	1,045	$	2,022
Additions	1,157		83		1,240
Allocations from DXC	11		—		11
Balance as of September 30, 2018	$	2,145	$	1,128	$	3,273

The additions to goodwill during six months ended September 30, 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.