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Segment Information
 12 Months Ended
Dec. 31, 2020
Segment Reporting [Abstract]  
Segment Information SEGMENT INFORMATION
We have four operating segments: Aerospace, Marine Systems, Combat Systems and Technologies. We organize our segments in accordance with the nature of products and services offered. We measure each segment’s profitability based on operating earnings. As a result, we do not allocate net interest, other income and expense items, and income taxes to our segments.
Summary financial information for each of our segments follows:
Revenue*Operating EarningsRevenue from
U.S. Government
Year Ended December 31202020192018202020192018202020192018
Aerospace$8,075 $9,801 $8,455 $1,083 $1,532 $1,490 $513 $498 $334 
Marine Systems9,979 9,183 8,502 854 785 761 9,871 9,027 8,245 
Combat Systems7,223 7,007 6,241 1,041 996 962 4,191 4,048 3,228 
Technologies12,648 13,359 12,995 1,211 1,311 1,267 11,728 12,234 11,799 
Corporate— — — (56)(54)(86)— — — 
Total$37,925 $39,350 $36,193 $4,133 $4,570 $4,394 $26,303 $25,807 $23,606 
*See Note B for additional revenue information by segment.
Corporate operating results consist primarily of equity-based compensation expense. Corporate operating results in 2018 also included one-time charges of approximately $45 associated with the costs to complete the CSRA acquisition.
The following is additional summary financial information for each of our segments:
Identifiable AssetsCapital ExpendituresDepreciation and Amortization
Year Ended December 31202020192018202020192018202020192018
Aerospace$12,050 $12,324 $11,220 $95 $138 $194 $201 $178 $154 
Marine Systems4,488 3,918 3,304 604 449 243 145 122 116 
Combat Systems12,034 11,220 9,872 92 109 91 95 85 87 
Technologies19,663 20,453 20,143 172 222 111 428 437 398 
Corporate*3,073 1,434 1,348 4 69 51 9 7 8 
Total$51,308 $49,349 $45,887 $967 $987 $690 $878 $829 $763 
*Corporate identifiable assets are primarily cash and equivalents.
The following table presents our revenue by geographic area based on the location of our customers:
Year Ended December 31202020192018
North America:
United States$31,194 $31,775 $28,386 
Other1,078 898 813 
Total North America32,272 32,673 29,199 
Europe2,846 2,836 2,807 
Asia/Pacific1,292 1,739 2,287 
Africa/Middle East1,249 1,785 1,611 
South America266 317 289 
Total revenue$37,925 $39,350 $36,193 
Our revenue from non-U.S. operations was $4.3 billion in 2020, $4.4 billion in 2019 and $4.2 billion in 2018, and earnings from continuing operations before income taxes from non-U.S. operations were $585 in 2020, $600 in 2019 and $578 in 2018. The long-lived assets associated with these operations were 4% of our total long-lived assets on December 31, 2020 and 2019, and 3% on December 31, 2018.