Goodwill

The following table summarizes the changes in the carrying amount of Goodwill, by segment, as of December 31, 2017.



(in millions)	GBS		GIS		USPS		Total
Balance as of March 31, 2017, net	$	1,470	$	385	$	—	$	1,855
Additions	2,800		2,532		1,984		7,316
Foreign currency translation	94		55		—		149
Balance as of December 31, 2017, net	$	4,364	$	2,972	$	1,984	$	9,320

The additions to goodwill during the nine months ended December 31, 2017 were primarily due to the Merger described in Note 3 - "Acquisitions." As a result of the Merger, the Company began to report the United States Public Sector ("USPS") segment, formerly a component of the HPES business, see Note 17 - "Segment Information" for additional information. The foreign currency translation amounts reflect the impact of currency movements on non-U.S. dollar-denominated goodwill balances.

Goodwill Impairment Analyses

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 during the three months ended September 30, 2017, did not result in an impairment charge. This qualitative analysis, which is commonly referred to as step zero 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 2018, 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, 2017.