GOODWILL AND OTHER INTANGIBLE ASSETS

The following table presents goodwill balances and the movements for each of our reportable segments during the three months ended January 31, 2019:



	Life Sciences and Applied Markets		Diagnostics and Genomics		Agilent CrossLab		Total
	(in millions)
Goodwill as of October 31, 2018	$	803	$	1,607	$	563	$	2,973
Foreign currency translation impact	3		2		2		7
Goodwill arising from acquisitions	153		—		—		153
Goodwill as of January 31, 2019	$	959	$	1,609	$	565	$	3,133

The components of other intangible assets as of January 31, 2019 and October 31, 2018 are shown in the table below:



	Purchased Other Intangible Assets
	Gross Carrying Amount		Accumulated Amortization		Net Book Value
	(in millions)
As of October 31, 2018
Purchased technology	$	947	$	683	$	264
Trademark/Tradename	151		88		63
Customer relationships	107		63		44
Third-party technology and licenses	28		19		9
Total amortizable intangible assets	1,233		853		380
In-Process R&D	111		—		111
Total	$	1,344	$	853	$	491
As of January 31, 2019
Purchased technology	$	1,028	$	703	$	325
Trademark/Tradename	153		92		61
Customer relationships	128		67		61
Third-party technology and licenses	28		20		8
Total amortizable intangible assets	1,337		882		455
In-Process R&D	111		—		111
Total	$	1,448	$	882	$	566

On November 14, 2018, we acquired 100 percent of the stock of ACEA Biosciences (“ACEA”), a developer of cell analysis tools, for approximately $250 million in cash. The financial results of ACEA have been included within our financial results from the date of the close. The purchase accounting for this acquisition is substantially complete and will be finalized during 2019, as we assess the tax impact and finalize the intangibles valuation of the acquisition.

In general, for United States Federal Tax Purposes, goodwill from asset purchases is deductible, however any goodwill created as part of a stock acquisition is not deductible.

During the three months ended January 31, 2019, we recorded additions to goodwill of $153 million and additions to other intangible assets of $102 million related to the ACEA acquisition. During the three months ended January 31, 2019, other intangible assets, net increased $2 million due to the impact of foreign exchange translation.

Each quarter we review the events and circumstances to determine if impairment of indefinite-lived intangible assets and goodwill is indicated. There were no indicators of impairments of indefinite-lived intangible assets or goodwill during the three months ended January 31, 2019 and 2018, respectively.

Amortization expense of intangible assets was $29 million and $26 million for the three months ended January 31, 2019 and 2018, respectively.

Future amortization expense related to existing finite-lived purchased intangible assets for the remainder of fiscal year 2019 and for each of the five succeeding fiscal years and thereafter is estimated below:



Estimated future amortization expense:
(in millions)
Remainder of 2019	$	80
2020	$	95
2021	$	81
2022	$	65
2023	$	55
2024	$	46
Thereafter	$	33