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Business Group Information
 9 Months Ended
Sep. 28, 2014
Segment Reporting [Abstract]  
Business Group Information
BUSINESS GROUP INFORMATION
We operate in four business groups: Aerospace, Combat Systems, Marine Systems and Information Systems and Technology. We organize our business groups in accordance with the nature of products and services offered. These business groups derive their revenues from business aviation; combat vehicles, weapons systems and munitions; military and commercial shipbuilding and related services; and communication and information technology systems and solutions, respectively. We measure each group’s profit based on operating earnings. As a result, we do not allocate net interest, other income and expense items, and income taxes to our business groups.
Summary financial information for each of our business groups follows:
 
Revenues
Operating Earnings
Three Months Ended
September 29, 2013
September 28, 2014
September 29, 2013
September 28, 2014
Aerospace
$
2,152

$
2,289

$
369

$
411

Combat Systems
1,306

1,395

228

232

Marine Systems
1,697

1,820

170

170

Information Systems and Technology
2,580

2,247

216

202

Corporate*
—

—

(22
)
(16
)
 
$
7,735

$
7,751

$
961

$
999



 
Revenues
Operating Earnings
Nine Months Ended
September 29, 2013
September 28, 2014
September 29, 2013
September 28, 2014
Aerospace
$
5,983

$
6,409

$
1,068

$
1,199

Combat Systems
4,241

4,118

658

591

Marine Systems
5,082

5,272

507

510

Information Systems and Technology
7,577

6,691

599

573

Corporate*
—

—

(67
)
(51
)
 
$
22,883

$
22,490

$
2,765

$
2,822

*Corporate operating results consist primarily of stock option expense.