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Segment Information (Tables)
 12 Months Ended
Dec. 31, 2021
Segment Reporting [Abstract]  
Schedule of Financial Information For Each Of Our Business Groups
Summary financial information for each of our segments follows:
Revenue (a)Operating EarningsRevenue from
U.S. Government
Year Ended December 31202120202019202120202019202120202019
Aerospace$8,135 $8,075 $9,801 $1,031 $1,083 $1,532 $339 $513 $498 
Marine Systems10,526 9,979 9,183 874 854 785 10,517 9,871 9,027 
Combat Systems7,351 7,223 7,007 1,067 1,041 996 4,173 4,191 4,048 
Technologies12,457 12,648 13,359 1,275 1,211 1,311 11,817 11,728 12,234 
Corporate (b)— — — (84)(56)(54)— — — 
Total$38,469 $37,925 $39,350 $4,163 $4,133 $4,570 $26,846 $26,303 $25,807 
(a)See Note B for additional revenue information by segment.
(b)Corporate operating results consist primarily of equity-based compensation expense.
The following is additional summary financial information for each of our segments:
Identifiable AssetsCapital ExpendituresDepreciation and Amortization
Year Ended December 31202120202019202120202019202120202019
Aerospace$11,748 $12,050 $12,324 $102 $95 $138 $205 $201 $178 
Marine Systems5,294 4,488 3,918 573 604 449 165 145 122 
Combat Systems11,657 12,034 11,220 100 92 109 109 95 85 
Technologies19,490 19,663 20,453 111 172 222 401 428 437 
Corporate*1,884 3,073 1,434 1 4 69 10 9 7 
Total$50,073 $51,308 $49,349 $887 $967 $987 $890 $878 $829 
*Corporate identifiable assets are primarily cash and equivalents.
Schedule of Revenue from External Customers Attributed to Foreign Countries by Geographic Area
The following table presents our revenue by geographic area based on the location of our customers:
Year Ended December 31202120202019
North America:
United States$31,654 $31,194 $31,775 
Other934 1,078 898 
Total North America32,588 32,272 32,673 
Europe2,675 2,846 2,836 
Asia/Pacific1,269 1,292 1,739 
Africa/Middle East1,703 1,249 1,785 
South America234 266 317 
Total revenue$38,469 $37,925 $39,350