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Segment Information | 6 Months Ended
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Jul. 01, 2018
Segment Reporting [Abstract] |
Segment Information | SEGMENT INFORMATION We have five operating segments, Aerospace, Combat Systems, Information Technology, Mission Systems and Marine Systems. 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 Earnings | Revenue from U.S. Government
Three Months Ended | July 1, 2018 | July 2, 2017 | July 1, 2018 | July 2, 2017 | July 1, 2018 | July 2, 2017
Aerospace | $ | 1,895 |  | $ | 2,078 |  | $ | 386 |  | $ | 421 |  | $ | 108 |  | $ | 41 |
Combat Systems | 1,534 |  | 1,414 |  | 236 |  | 225 |  | 746 |  | 744 |
Information Technology | 2,442 |  | 1,052 |  | 156 |  | 87 |  | 2,370 |  | 981 |
Mission Systems | 1,147 |  | 1,052 |  | 153 |  | 153 |  | 908 |  | 840 |
Marine Systems | 2,168 |  | 2,079 |  | 195 |  | 178 |  | 2,072 |  | 2,056 |
Corporate | — |  | — |  | (38 | ) | 3 |  | — |  | — |
Total | $ | 9,186 |  | $ | 7,675 |  | $ | 1,088 |  | $ | 1,067 |  | $ | 6,204 |  | $ | 4,662 |
Six Months Ended |  |  |  |  |  |
Aerospace | $ | 3,720 |  | $ | 4,152 |  | $ | 732 |  | $ | 860 |  | $ | 165 |  | $ | 90 |
Combat Systems | 2,974 |  | 2,701 |  | 460 |  | 430 |  | 1,423 |  | 1,463 |
Information Technology | 3,580 |  | 2,110 |  | 257 |  | 177 |  | 3,448 |  | 1,974 |
Mission Systems | 2,245 |  | 2,140 |  | 299 |  | 299 |  | 1,775 |  | 1,699 |
Marine Systems | 4,202 |  | 4,013 |  | 379 |  | 339 |  | 4,051 |  | 3,951 |
Corporate | — |  | — |  | (31 | ) | 8 |  | — |  | — |
Total | $ | 16,721 |  | $ | 15,116 |  | $ | 2,096 |  | $ | 2,113 |  | $ | 10,862 |  | $ | 9,177 |
Corporate operating results have two primary components: pension and other post-retirement benefit income, and stock option expense. ASU 2017-07 requires the non-service cost components of pension and other post-retirement benefit cost (e.g., interest cost) to be reported in other income (expense) in the Consolidated Statement of Earnings. In our defense segments, pension and other post-retirement benefit costs are allocable contract costs. For these segments, we report the offset for the non-service cost components in Corporate operating results. The second quarter and first six months of 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:
| Capital Expenditures | Depreciation and Amortization
Six Months Ended | July 1, 2018 | July 2, 2017 | July 1, 2018 | July 2, 2017
Aerospace | $ | 102 |  | $ | 50 |  | $ | 72 |  | $ | 77 |
Combat Systems | 26 |  | 31 |  | 42 |  | 42 |
Information Technology | 21 |  | 4 |  | 120 |  | 15 |
Mission Systems | 26 |  | 25 |  | 33 |  | 29 |
Marine Systems | 81 |  | 37 |  | 55 |  | 51 |
Corporate | 23 |  | 6 |  | 5 |  | 6 |
Total | $ | 279 |  | $ | 153 |  | $ | 327 |  | $ | 220 |
Identifiable assets for each of our segments follows:
| July 1, 2018 |  | December 31, 2017
Aerospace | $ | 10,990 |  |  | $ | 10,126 |
Combat Systems | 10,110 |  |  | 9,846 |
Information Technology | 14,918 |  |  | 3,021 |
Mission Systems | 6,079 |  |  | 5,856 |
Marine Systems | 2,917 |  |  | 2,906 |
Corporate* | 2,138 |  |  | 3,291 |
Total | $ | 47,152 |  |  | $ | 35,046 |
* Corporate identifiable assets are primarily cash and equivalents.

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- Definition The entire disclosure for reporting segments including data and tables. Reportable segments include those that meet any of the following quantitative thresholds a) it's reported revenue, including sales to external customers and intersegment sales or transfers is 10 percent or more of the combined revenue, internal and external, of all operating segments b) the absolute amount of its reported profit or loss is 10 percent or more of the greater, in absolute amount of 1) the combined reported profit of all operating segments that did not report a loss or 2) the combined reported loss of all operating segments that did report a loss c) its assets are 10 percent or more of the combined assets of all operating segments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -URI http://asc.fasb.org/topic&trid=2134510 + Details
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