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Goodwill and Identifiable Intangible Assets (Tables)
 12 Months Ended
Dec. 31, 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)
December 31, 2016
 
 
 
 
 
 
 
Goodwill
$
2,512

 
$
1,883

 
$
2,083

 
$
6,478

Accumulated impairment losses
(46
)
 
(15
)
 
(43
)
 
(104
)
 
2,466

 
1,868

 
2,040

 
6,374

Business acquisitions(1)
8

 
73

 
131

 
212

Business divestitures(2)
—

 
—

 
(12
)
 
(12
)
Foreign currency translation adjustments
26

 
21

 
46

 
93

Assets held for sale(3)
(42
)
 
—

 
(10
)
 
(52
)
 
 
 
 
 
 
 
 
December 31, 2017
 
 
 
 
 
 
 
Goodwill
2,504

 
1,977

 
2,238

 
6,719

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

 
1,962

 
2,195

 
6,615

Business acquisitions(1)
158

 
56

 
33

 
247

Foreign currency translation adjustments
(20
)
 
(11
)
 
(23
)
 
(54
)
 
 
 
 
 
 
 
 
December 31, 2018
 
 
 
 
 
 
 
Goodwill
2,634

 
2,022

 
2,248

 
6,904

Accumulated impairment losses
(46
)
 
(15
)
 
(43
)
 
(104
)
 
$
2,596

 
$
2,007

 
$
2,205

 
$
6,808

__________________
(1) 
For the year ended December 31, 2018, business acquisitions for the ISRS segment included the acquisitions of the Azimuth Security and Linchpin Labs and Applied Defense Solutions businesses and the purchase price allocation adjustments for the Kigre business acquisition. Business acquisitions for the C&NS segment included the acquisitions of the ASV Global business and purchase price allocation adjustments for the Adaptive Methods business acquisition. Business acquisitions for the Electronic Systems segment included the acquisitions of the Latitude Engineering and C.K. Industrial Engineers businesses and purchase price allocation adjustments for the G-Air and Doss Aviation business acquisitions. For the year ended December 31, 2017, business acquisitions for the ISRS segment included primarily the Kigre business acquisition. Business acquisitions for the C&NS segment included primarily the Adaptive Methods, Open Water Power, and OceanServer business acquisitions. Business acquisitions for the Electronic Systems segment included the acquisitions of the ETD, Doss Aviation and G-Air businesses and purchase price allocation adjustments for the MacH and Aerosim business acquisitions.
(2) 
The decrease for the Electronic Systems segment was due to the divestitures of Coleman and Aviation Jet Services during the quarterly period ended March 31, 2017.
(3) 
The Crestview & TCS businesses from the Company’s ISRS segment were classified as held for sale as of December 31, 2017.
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.
 
 
 
December 31, 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
 
$
468

 
$
288

 
$
180

 
$
393

 
$
257

 
$
136

Technology
9
 
245

 
132

 
113

 
189

 
114

 
75

Other
9
 
49

 
18

 
31

 
29

 
14

 
15

Total subject to amortization
 
 
762

 
438

 
324

 
611

 
385

 
226

IPR&D
indefinite
 
66

 
—

 
66

 
66

 
—

 
66

Total
 
 
$
828

 
$
438

 
$
390

 
$
677

 
$
385

 
$
292
Amortization Expense
The table below presents amortization expense recorded by the Company for its identifiable intangible assets.
 
Year Ended December 31,
 
2018
 
2017
 
2016
 
(in millions)
Amortization expense
$
49

 
$
43

 
$
33
Estimated Amortization Expense
Based on gross carrying amounts at December 31, 2018, the Company’s estimate of amortization expense for identifiable intangible assets for the years ending December 31, 2019 through 2023 is presented in the table below.
 
Year Ending December 31,
 
2019
 
2020
 
2021
 
2022
 
2023
 
(in millions)
Estimated amortization expense
$
51

 
$
47

 
$
42

 
$
37

 
$
28