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Goodwill and Intangible Assets
 9 Months Ended
Sep. 27, 2020
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and Intangible Assets GOODWILL AND INTANGIBLE ASSETS
Goodwill. The changes in the carrying amount of goodwill by reporting unit were as follows:
 
Aerospace
 
Combat Systems
 
Information Technology
 
Mission Systems
 
Marine Systems
 
Total
Goodwill
December 31, 2019 (a)
$
2,831

 
$
2,681

 
$
9,700

 
$
4,168

 
$
297

 
$
19,677

Acquisitions (b)
73

 
49

 
—

 
—

 
—

 
122

Other (c)
87

 
(6
)
 
—

 
9

 
—

 
90

September 27, 2020 (a)
$
2,991

 
$
2,724

 
$
9,700

 
$
4,177

 
$
297


$
19,889


(a)Goodwill in the Information Technology and Mission Systems reporting units is net of $536 and $1.3 billion of accumulated impairment losses, respectively.
(b)Includes businesses acquired in our Aerospace and Combat Systems segments and 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
 
September 27, 2020
 
December 31, 2019
Contract and program
    intangible assets (b)
$
3,745

$
(1,891
)
$
1,854

 
$
3,776

$
(1,779
)
$
1,997

Trade names and trademarks
496

(216
)
280

 
474

(195
)
279

Technology and software
130

(103
)
27

 
164

(126
)
38

Other intangible assets
159

(158
)
1

 
159

(158
)
1

Total intangible assets
$
4,530

$
(2,368
)
$
2,162

 
$
4,573

$
(2,258
)
$
2,315

(a)
Changes in gross carrying amounts consist primarily of adjustments for acquired and divested intangible assets and foreign currency translation.
(b)
Consists of acquired backlog and probable follow-on work and associated customer relationships.
Amortization expense is included in operating costs and expenses in the Consolidated Statement of Earnings. Amortization expense for intangible assets was $65 and $196 for the three- and nine-month periods ended September 27, 2020, and $69 and $209 for the three- and nine-month periods ended September 29, 2019, respectively.