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Goodwill and Identifiable Intangible Assets (Tables)
 12 Months Ended
Dec. 31, 2017
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, 2015
 
 
 
 
 
 
 
Goodwill
$
2,493

 
$
1,860

 
$
1,846

 
$
6,199

Accumulated impairment losses
(46
)
 
(15
)
 
(43
)
 
(104
)
 
2,447

 
1,845

 
1,803

 
6,095

Business acquisitions(1)
28

 
20

 
287

 
335

Foreign currency translation adjustments
(9
)
 
3

 
(50
)
 
(56
)
 
 
 
 
 
 
 
 
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

__________________
(1) 
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 the purchase price allocation adjustments for the MacH and Aerosim business acquisitions. For the year ended December 31, 2016, business acquisitions for the ISRS segment included the Micreo business acquisition and the final purchase price allocation for the L3 ForceX business acquisition. Business acquisition for the C&NS segment included the ATM business acquisition. Business acquisitions for the Electronic Systems segment included the acquisitions of the MacH and Aerosim businesses and the final purchase price allocation for L3 CTC business acquisition.
(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 Aerostructures businesses from the Company’s ISRS segment are 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, 2017
 
December 31, 2016
 
Weighed 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
14
 
$
393

 
$
257

 
$
136

 
$
360

 
$
229

 
$
131

Technology
10
 
189

 
114

 
75

 
191

 
102

 
89

Other
15
 
29

 
14

 
15

 
21

 
12

 
9

Total subject to amortization
 
 
611

 
385

 
226

 
572

 
343

 
229

IPR&D
indefinite
 
66

 
—

 
66

 
—

 
—

 
—

Total
 
 
$
677

 
$
385

 
$
292

 
$
572

 
$
343

 
$
229
Amortization Expense
The table below presents amortization expense recorded by the Company for its identifiable intangible assets.
 
Year Ended December 31,
 
2017
 
2016
 
2015
 
(in millions)
Amortization expense
$
43

 
$
33

 
$
32
Estimated Amortization Expense
Based on gross carrying amounts at December 31, 2017, 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
$
44

 
$
39

 
$
31

 
$
25

 
$
21