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Business Segment Information - Assets by Segment (Details) - USD ($) $ in Millions | Sep. 28, 2018 | Jun. 29, 2018
--- | --- | ---
Segment Reporting Information [Line Items] |  |
Assets | $ 9,889 | $ 9,851
Identifiable intangible assets | 960 | 989
Operating Segments | Communication Systems |  |
Segment Reporting Information [Line Items] |  |
Assets | 1,556 | 1,567
Operating Segments | Electronic Systems |  |
Segment Reporting Information [Line Items] |  |
Assets | 4,204 | 4,174
Operating Segments | Space and Intelligence Systems |  |
Segment Reporting Information [Line Items] |  |
Assets | 2,220 | 2,193
Corporate |  |
Segment Reporting Information [Line Items] |  |
Assets | 1,909 | 1,917
Corporate | Exelis |  |
Segment Reporting Information [Line Items] |  |
Identifiable intangible assets | $ 949 | $ 974

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