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Goodwill and Identifiable Intangible Assets (Tables)
 9 Months Ended
Sep. 28, 2018
Goodwill and Intangible Assets Disclosure [Abstract]  
Changes in Goodwill by Segment
The table below presents the changes in goodwill allocated to the Company’s reporting units in each reportable segment.
 
ISRS
 
C&NS
 
Electronic Systems
 
Consolidated Total
 
(in millions)
Goodwill
$
2,504

 
$
1,977

 
$
2,238

 
$
6,719

Accumulated impairment losses
(46
)
 
(15
)
 
(43
)
 
(104
)
December 31, 2017
2,458


1,962


2,195


6,615

Business acquisitions (1)
150

 
65

 
30

 
245

Foreign currency translation adjustments
(9
)
 
(4
)
 
(13
)
 
(26
)
September 28, 2018
2,599


2,023


2,212


6,834

Goodwill
2,645

 
2,038

 
2,255

 
6,938

Accumulated impairment losses
(46
)
 
(15
)
 
(43
)
 
(104
)
 
$
2,599


$
2,023


$
2,212


$
6,834

__________________
(1) 
The increase for the ISRS segment was due to the acquisitions of the Azimuth Security, Linchpin Labs and Applied Defense Solutions businesses and the purchase price allocation adjustments for the Kigre business acquisition. The increase for the C&NS segment was due to the acquisition of the ASV Global business and purchase price allocation adjustments for the Adaptive Methods business acquisition. The increase for the Electronic Systems segment was due to the acquisitions of the Latitude Engineering and C.K. Industrial Engineers businesses and the purchase price allocation adjustments for the G-Air and Doss Aviation business acquisitions.
Identifiable Intangible Assets
The table below presents information for the Company’s identifiable intangible assets that are subject to amortization and indefinite-lived intangible assets.
 
 
 
September 28, 2018
 
December 31, 2017
 
Weighted Average Amortization Period
 
Gross Carrying Amount
 
Accumulated Amortization
 
Net Carrying Amount
 
Gross Carrying Amount
 
Accumulated Amortization
 
Net Carrying Amount
 
(in years)
 
(in millions)
Customer contractual relationships
16
 
$
444

 
$
280

 
$
164

 
$
393

 
$
257

 
$
136

Technology
9
 
262

 
124

 
138

 
189

 
114

 
75

Other
10
 
61

 
15

 
46

 
29

 
14

 
15

Total subject to amortization

 
767


419


348


611


385


226

IPR&D
indefinite
 
66

 
—

 
66

 
66

 
—

 
66

Total
 
 
$
833


$
419


$
414


$
677


$
385


$
292
Amortization Expense
The table below presents amortization expense recorded by the Company for its identifiable intangible assets.
 
Third Quarter Ended
 
Year-to-Date Ended
 
September 28,
2018
 
September 29,
2017
 
September 28, 2018
 
September 29, 2017
 
(in millions)
Amortization expense
$
10

 
$
10

 
32

 
30
Estimated Amortization Expense
Based on gross carrying amounts at September 28, 2018, the Company’s estimate of amortization expense for identifiable intangible assets for the years ending December 31, 2018 through 2022 is presented in the table below.
 
Year Ending December 31,
 
2018
 
2019
 
2020
 
2021
 
2022
 
(in millions)
Estimated amortization expense
$
49

 
$
59

 
$
52

 
$
45

 
$
38