GOODWILL AND OTHER INTANGIBLE ASSETS
 6 Months Ended
Apr. 30, 2017
Goodwill and Intangible Assets Disclosure [Abstract]  
GOODWILL AND OTHER INTANGIBLE ASSETS
GOODWILL AND OTHER INTANGIBLE ASSETS
The following table presents goodwill balances and the movements for each of our reportable segments as of and for the six months ended April 30, 2017:
 
Communications Solutions Group
 
Electronic Industrial Solutions Group
 
Ixia Solutions Group
 
Services Solutions Group
 
Total
 
(in millions)
Goodwill as of October 31, 2016
$
456

 
$
216

 
$
—

 
$
64

 
$
736

Foreign currency translation impact
(11
)
 
—

 
—

 
—

 
(11
)
Goodwill arising from acquisitions
—

 
—

 
977

 
—

 
977

Goodwill as of April 30, 2017
$
445

 
$
216

 
$
977

 
$
64

 
$
1,702


The components of other intangible assets as of April 30, 2017 and October 31, 2016 are shown in the table below:
 
Other Intangible Assets as of April 30, 2017
 
Other Intangible Assets as of October 31, 2016
 
Gross
Carrying
Amount
 
Accumulated
Amortization
and
Impairments
 
Net Book
Value
 
Gross
Carrying
Amount
 
Accumulated
Amortization
and
Impairments
 
Net Book
Value
 
(in millions)
Developed technology
$
735

 
$
180

 
$
555

 
$
309

 
$
159

 
$
150

Backlog
14

 
6

 
8

 
4

 
4

 
—

Trademark/Tradename
32

 
5

 
27

 
20

 
4

 
16

Customer relationships
301

 
40

 
261

 
65

 
35

 
30

Total amortizable intangible assets
1,082

 
231


851

 
398

 
202

 
196

In-Process R&D
67

 
—

 
67

 
12

 
—

 
12

Total
$
1,149

 
$
231

 
$
918

 
$
410

 
$
202

 
$
208

 
During the six months ended April 30, 2017, we recognized additions to goodwill and other intangible assets of $977 million and $746 million, respectively, based on the preliminary allocation of the purchase price to the estimated fair values of the assets acquired and liabilities assumed in the acquisition of Ixia. During the six months ended April 30, 2017, there was no foreign exchange translation impact to other intangible assets.
During the first quarter of 2017, we transferred $5 million from in-process R&D to developed technology as a project was successfully completed. During the second quarter of 2017, we recorded an impairment charge of $7 million related to the cancellation of an in-process R&D project.
Amortization of other intangible assets was $18 million and $29 million for the three and six months ended April 30, 2017, respectively. Amortization of other intangible assets was $10 million and $22 million for the three and six months ended April 30, 2016, respectively. Future amortization expense related to existing finite-lived purchased intangible assets is estimated to be $100 million for the remainder of 2017, $181 million for 2018, $181 million for 2019, $179 million for 2020, $113 million for 2021 and $97 million thereafter.