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RESTRUCTURING AND OTHER EXIT COSTS - Additional Information (Details) $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Jan. 03, 2020 USD ($) | Jan. 03, 2020 USD ($) | Jun. 29, 2018 USD ($) | Jun. 30, 2017 USD ($) | Oct. 01, 2020 floor | Dec. 03, 2019 floor | Jun. 28, 2019 USD ($)
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Restructuring charges |  | $ 117 | $ 51 |  |  |  |
Restructuring reserve | $ 65 | 65 | 45 | $ 43 |  |  | $ 16
Integration Activities |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Restructuring reserve |  |  | 27 |  |  |  | 16
Workforce reduction |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Restructuring charges |  | 117 | 1 |  |  |  |
Restructuring reserve | 58 | 58 | 2 | 12 |  |  | 0
Lease Termination |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Number of leased floors | floor |  |  |  |  |  | 6 |
Loss on termination of lease | 2 |  |  |  |  |  |
Impairment charge for ROU asset | 46 |  |  |  |  |  |
Facilities closing and contract termination |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Restructuring charges |  | 0 | 50 |  |  |  |
Restructuring reserve | $ 7 | $ 7 | 43 | 31 |  |  | $ 16
Remaining lease term (less than) |  | 4 years |  |  |  |  |
Engineering, selling and administrative expenses |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Restructuring reserve |  |  | 18 |  |  |  |
Engineering, selling and administrative expenses | Exelis |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Restructuring charges |  |  | 5 | $ 58 |  |  |
Engineering, selling and administrative expenses | Facilities closing and contract termination |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Restructuring charges |  |  | $ 45 |  |  |  |
Forecast | Lease Termination |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Number of leased floors | floor |  |  |  |  | 5 |  |

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