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SIGNIFICANT ACCOUNTING POLICIES - Additional Information (Details) $ / shares in Units, engineer in Thousands, $ in Millions |  | 12 Months Ended |
--- | --- | --- | ---
Jun. 29, 2019 employee country | Jun. 28, 2019 USD ($) employee engineer site country $ / shares | Jun. 29, 2018 USD ($) $ / shares | Jun. 30, 2017 USD ($) $ / shares | Sep. 27, 2019 USD ($)
Change in Accounting Estimate [Line Items] |  |  |  |  |
Number of countries in which entity operates | country |  | 100 |  |  |
Number of employees | employee |  | 18,200 |  |  |
Number of engineers and scientists | engineer |  | 8 |  |  |
Amortization period for contract costs |  | 1 year |  |  |
Threshold for separate line item reporting of total current assets or total assets in Consolidated Balance Sheets |  | 5.00% | 5.00% |  |
Threshold for separate line item reporting of total current liabilities or total liabilities in Consolidated Balance Sheet |  | 5.00% | 5.00% |  |
Revenue recognized from performance obligations satisfied in previous periods |  | $ 59 | $ 43 | $ 45 |
Total number of sites for existence of future environment liabilities | site |  | 60 |  |  |
Number of sites owned by the company | site |  | 5 |  |  |
Number of sites associated with former graphics or semiconductor locations | site |  | 47 |  |  |
Treatment or disposal sites not owned by the company that contain hazardous substances allegedly attributable to the company from past operations | site |  | 8 |  |  |
Accrual for environment loss contingencies |  | $ 99 |  |  |
Fair value of environmental liabilities |  | 93 |  |  |
Other environmental liabilities |  | 6 |  |  |
Contracts Accounted for under Percentage of Completion |  |  |  |  |
Change in Accounting Estimate [Line Items] |  |  |  |  |
Operating income (loss) |  | 17 | (19) | $ (1) |
Operating income (loss), after tax |  | $ 13 | $ (13) |  |
Operating income (loss), per diluted share (in dollars per share) | $ / shares |  | $ 0.10 | $ (0.11) | $ (0.01) |
L3Harris | Subsequent Event |  |  |  |  |
Change in Accounting Estimate [Line Items] |  |  |  |  |
Number of countries in which entity operates | country | 130 |  |  |  |
Number of employees | employee | 50,000 |  |  |  |
Fixed exchange conversion ratio per share | 1.30 |  |  |  |
L3Harris | Discontinued Operations, Disposed of by Sale | Harris Night Vision | Communication Systems | Subsequent Event | Forecast |  |  |  |  |
Change in Accounting Estimate [Line Items] |  |  |  |  |
Cash proceeds from divestiture of business |  |  |  |  | $ 350
L3Harris | Former Harris Shareholders | Subsequent Event |  |  |  |  |
Change in Accounting Estimate [Line Items] |  |  |  |  |
Percentage of voting interests acquired | 54.00% |  |  |  |
L3Harris | Former L3 Shareholders | Subsequent Event |  |  |  |  |
Change in Accounting Estimate [Line Items] |  |  |  |  |
Percentage of voting interests acquired | 46.00% |  |  |  |

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