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DISCONTINUED OPERATIONS AND DIVESTITURES - Additional Information (Details) - USD ($) $ / shares in Units, $ in Millions |  |  |  | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Apr. 28, 2017 | Mar. 31, 2017 | Jan. 01, 2017 | Jun. 28, 2019 | Jun. 29, 2018 | Jun. 30, 2017 | Sep. 27, 2019
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Discontinued operations, per diluted share (in dollars per share) |  |  |  | $ (0.03) | $ (0.02) | $ (0.68) |
Discontinued Operations, Disposed of by Sale | IT Services | Critical Networks |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Proceeds from sale of discontinued operations, subject to post-closing adjustments, net | $ 646 |  |  |  |  |  |
Gain (loss) on sale of discontinued operations, before tax | (28) |  |  |  |  |  |
Gain (loss) on disposal of discontinued operation, net of tax | $ 55 |  |  |  |  |  |
Discontinued operations, per diluted share (in dollars per share) | $ 0.44 |  |  |  |  |  |
Discontinued operation, period of continuing involvement after disposal | 18 months |  |  |  |  |  |
Goodwill assigned to disposal group |  | $ 487 |  |  |  |  |
Non-cash impairment asset charge in discontinued operations |  | 240 |  |  |  |  |
Goodwill impairment loss |  | $ 228 |  |  |  |  |
Discontinued Operations, Disposed of by Sale | Caprock |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Proceeds from sale of discontinued operations, subject to post-closing adjustments, net |  |  | $ 368 |  |  |  |
Gain (loss) on sale of discontinued operations, before tax |  |  | 14 |  |  |  |
Gain (loss) on disposal of discontinued operation, net of tax |  |  | $ 61 |  |  |  |
Discontinued operations, per diluted share (in dollars per share) |  |  | $ 0.49 |  |  |  |
Subsequent Event | L3Harris | Discontinued Operations, Disposed of by Sale | Harris Night Vision | Forecast | Communication Systems |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Cash proceeds from divestiture of business |  |  |  |  |  |  | $ 350

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