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Business Segments - Assets by Segment (Details) - USD ($) $ in Millions | Dec. 29, 2017 | Jun. 30, 2017
--- | --- | ---
Segment Reporting Information [Line Items] |  |
Assets | $ 9,856 | $ 10,090
Identifiable intangible assets | 1,048 | 1,104
Operating Segments | Communication Systems |  |
Segment Reporting Information [Line Items] |  |
Assets | 1,541 | 1,534
Operating Segments | Electronic Systems |  |
Segment Reporting Information [Line Items] |  |
Assets | 4,137 | 4,094
Operating Segments | Space and Intelligence Systems |  |
Segment Reporting Information [Line Items] |  |
Assets | 2,155 | 2,117
Corporate |  |
Segment Reporting Information [Line Items] |  |
Assets | 2,023 | 2,345
Corporate | Exelis |  |
Segment Reporting Information [Line Items] |  |
Identifiable intangible assets | $ 1,000 | $ 1,000

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