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SIGNIFICANT ACCOUNTING POLICIES - Additional Information (Details) engineer in Thousands, employee in Thousands, $ in Millions |  |  | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Sep. 13, 2019 USD ($) | Jun. 29, 2019 | Jan. 03, 2020 USD ($) employee engineer site country | Jun. 28, 2019 USD ($) | Jun. 29, 2018 USD ($) | Jun. 30, 2017 USD ($) | Dec. 29, 2017
Business Combination, Separately Recognized Transactions [Line Items] |  |  |  |  |  |  |
Number of countries in which entity operates | country |  |  | 130 |  |  |  |
Number of employees | employee |  |  | 50 |  |  |  |
Number of engineers | engineer |  |  | 20 |  |  |  |
Proceeds from sales of businesses, net |  |  | $ 343 | $ 0 | $ 0 | $ 1,014 |
Internal use software, useful life minimum |  |  | 3 years |  |  |  |
Internal use software, useful life maximum |  |  | 10 years |  |  |  |
Threshold for separate line item reporting of total current assets or total assets in Consolidated Balance Sheets |  |  | 5.00% | 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% |  |  | 5.00%
Amortization period for contract costs |  |  | 1 year |  |  |  |
Revenue recognized from performance obligations satisfied in previous periods |  |  | $ 98 | $ 59 | $ 43 | $ 45 |
Number of sites with future environmental liabilities | site |  |  | 84 |  |  |  |
Number of sites owned | site |  |  | 8 |  |  |  |
Number of sites associated with former locations or operations | site |  |  | 66 |  |  |  |
Number of treatment or disposal sites not owned | site |  |  | 10 |  |  |  |
Accrual for environment loss contingencies |  |  | $ 115 |  |  |  |
L3Harris |  |  |  |  |  |  |
Business Combination, Separately Recognized Transactions [Line Items] |  |  |  |  |  |  |
Exchange ratio |  | 1.30 |  |  |  |  |
L3Harris | Harris Night Vision | Discontinued Operations, Disposed of by Sale |  |  |  |  |  |  |
Business Combination, Separately Recognized Transactions [Line Items] |  |  |  |  |  |  |
Cash price on sale of business | $ 350 |  |  |  |  |  |
Proceeds from sales of businesses, net | 343 |  |  |  |  |  |
L3Harris | Former Harris Shareholders |  |  |  |  |  |  |
Business Combination, Separately Recognized Transactions [Line Items] |  |  |  |  |  |  |
Percentage of voting interests acquired |  | 54.00% |  |  |  |  |
L3Harris | Former L3 Shareholders |  |  |  |  |  |  |
Business Combination, Separately Recognized Transactions [Line Items] |  |  |  |  |  |  |
Percentage of voting interests acquired |  | 46.00% |  |  |  |  |
Maximum | Building |  |  |  |  |  |  |
Business Combination, Separately Recognized Transactions [Line Items] |  |  |  |  |  |  |
Property, plant and equipment, useful life |  |  | 45 years |  |  |  |
Maximum | Machinery and Equipment |  |  |  |  |  |  |
Business Combination, Separately Recognized Transactions [Line Items] |  |  |  |  |  |  |
Property, plant and equipment, useful life |  |  | 10 years |  |  |  |
Minimum | Building |  |  |  |  |  |  |
Business Combination, Separately Recognized Transactions [Line Items] |  |  |  |  |  |  |
Property, plant and equipment, useful life |  |  | 2 years |  |  |  |
Minimum | Machinery and Equipment |  |  |  |  |  |  |
Business Combination, Separately Recognized Transactions [Line Items] |  |  |  |  |  |  |
Property, plant and equipment, useful life |  |  | 2 years |  |  |  |
Other non-reportable business segments | L3Harris | Harris Night Vision | Discontinued Operations, Disposed of by Sale |  |  |  |  |  |  |
Business Combination, Separately Recognized Transactions [Line Items] |  |  |  |  |  |  |
Cash price on sale of business | 350 |  |  |  |  |  |
Proceeds from sales of businesses, net | $ 343 |  |  |  |  |  |
Other current assets |  |  |  |  |  |  |
Business Combination, Separately Recognized Transactions [Line Items] |  |  |  |  |  |  |
Capitalized costs to obtain or fulfill a contract |  |  | $ 14 |  |  |  |
Other non-current assets |  |  |  |  |  |  |
Business Combination, Separately Recognized Transactions [Line Items] |  |  |  |  |  |  |
Capitalized costs to obtain or fulfill a contract |  |  | $ 48 |  |  |  |

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