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Acquisitions and Divestitures, Goodwill, and Intangible Assets (Tables)
 3 Months Ended
Apr. 02, 2017
Goodwill and Intangible Assets Disclosure [Abstract]  
Changes In The Carrying Amount Of Goodwill By Reporting Unit
The changes in the carrying amount of goodwill by reporting unit for the three-month period ended April 2, 2017, were as follows:
 
Aerospace
 
Combat Systems
 
Information Systems and Technology
 
Marine Systems
 
Total
Goodwill
December 31, 2016 (a)
$
2,537

 
$
2,598

 
$
6,013

 
$
297

 
$
11,445

Acquisitions (b)
33

 
—

 
—

 
—

 
33

Other (c)
35

 
15

 
4

 
—

 
54

April 2, 2017
$
2,605

 
$
2,613

 
$
6,017

 
$
297

 
$
11,532


(a)Goodwill on December 31, 2016, in the Information Systems and Technology reporting unit is net of $2 billion of accumulated impairment losses.
(b)Includes adjustments during the purchase price allocation period.
(c)Consists primarily of adjustments for foreign currency translation.
Intangible Assets
Intangible assets consisted of the following:
 
Gross Carrying Amount (a)
Accumulated Amortization
Net Carrying Amount
 
Gross Carrying Amount (a)
Accumulated Amortization
Net Carrying Amount
 
April 2, 2017
 
December 31, 2016
Contract and program intangible assets (b)
$
1,626

$
(1,273
)
$
353

 
$
1,633

$
(1,281
)
$
352

Trade names and trademarks
455

(146
)
309

 
446

(139
)
307

Technology and software
120

(103
)
17

 
121

(102
)
19

Other intangible assets
154

(154
)
—

 
154

(154
)
—

Total intangible assets
$
2,355

$
(1,676
)
$
679

 
$
2,354

$
(1,676
)
$
678

(a)
Change in gross carrying amounts consists primarily of adjustments for foreign currency translation and acquired intangible assets.
(b)
Consists of acquired backlog and probable follow-on work and associated customer relationships.