BOEING CO | 2013 | FY | 3


The gross carrying amounts and accumulated amortization of our acquired finite-lived intangible assets were as follows at December 31:
 
2013
 
2012
 
Gross
Carrying
Amount

 
Accumulated
Amortization

 
Gross
Carrying
Amount

 
Accumulated
Amortization

Distribution rights

$2,275

 

$483

 

$2,132

 

$388

Product know-how
507

 
199

 
507

 
171

Customer base
615

 
347

 
617

 
300

Developed technology
853

 
742

 
865

 
717

Other
233

 
157

 
214

 
145

Total

$4,483

 

$1,928

 

$4,335

 

$1,721


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Changes in the carrying amount of goodwill by reportable segment for the years ended December 31, 2013, 2012 and 2011 were as follows:
 
Commercial
Airplanes

 
Boeing
Military
Aircraft

 
Network
& Space
Systems

 
Global
Services
& Support

 
Total

Balance at January 1, 2011

$2,110

 

$1,041

 

$1,461

 

$325

 

$4,937

Acquisitions


 
 
 
16

 


 
16

Goodwill adjustments
(4
)
 
 
 
(4
)
 


 
(8
)
Balance at December 31, 2011

$2,106

 

$1,041

 

$1,473

 

$325

 

$4,945

Acquisitions
12

 
 
 


 
72

 
84

Goodwill adjustments
7

 
 
 
(1
)
 
 
 
6

Balance at December 31, 2012

$2,125

 

$1,041

 

$1,472

 

$397

 

$5,035

Acquisitions


18

 
 

7

 
25

Goodwill adjustments (1)
(17
)

(45
)

41


4

 
(17
)
Balance at December 31, 2013

$2,108

 

$1,014



$1,513



$408



$5,043


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Estimated amortization expense for the five succeeding years is as follows:
 
2014

 
2015

 
2016

 
2017

 
2018

Estimated amortization expense

$219

 

$214

 

$199

 

$193

 

$186


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