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Acquisitions, Divestitures and Goodwill (Tables)
 12 Months Ended
Dec. 31, 2019
Business Acquisition [Line Items]  
Rollforward of Goodwill by Segment
A rollforward of goodwill by segment was as follows: 
(In millions)
Integrated Defense Systems

 
Intelligence, Information and Services

 
Missile Systems

 
Space and Airborne Systems

 
Forcepoint

 
Total

Balance at December 31, 2017
$
1,706

 
$
2,967

 
$
4,154

 
$
4,106

 
$
1,938

 
$
14,871

Acquisitions and divestitures
—

 
—

 
—

 
(3
)
 
—

 
(3
)
Effect of foreign exchange rates and other
(2
)
 
(2
)
 
—

 
—

 
—

 
(4
)
Balance at December 31, 2018
1,704

 
2,965

 
4,154

 
4,103

 
1,938

 
14,864

Acquisitions and divestitures
—

 
19

 
—

 
—

 
—

 
19

Effect of foreign exchange rates and other
(1
)
 
—

 
—

 
—

 
—

 
(1
)
Balance at December 31, 2019
$
1,703

 
$
2,984

 
$
4,154

 
$
4,103

 
$
1,938

 
$
14,882