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RESTRUCTURING AND OTHER EXIT COSTS - Narrative (Details) $ in Millions | 6 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Jan. 03, 2020 USD ($) | Jan. 01, 2021 USD ($) floor | Jun. 28, 2019 USD ($) | Jun. 29, 2018 USD ($) | Oct. 01, 2020 floor | Dec. 03, 2019 floor
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring charges, recognized as incurred | $ 117 | $ 26 |  |  |  |
Restructuring reserve | 65 | 39 | $ 16 |  |  |
Workforce reduction |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring charges, recognized as incurred | 117 | 26 |  |  |  |
Restructuring reserve | 58 | 34 | 0 |  |  |
Workforce reduction | COVID |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring reserve |  | 8 |  |  |  |
Workforce reduction | Communication Systems | COVID |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring charges, recognized as incurred |  | 1 |  |  |  |
Workforce reduction | Aviation Systems | COVID |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring charges, recognized as incurred |  | $ 15 |  |  |  |
Lease Termination |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Number of leased floors | floor |  |  |  |  | 5 | 6
Number of subleased floors | floor |  | 3 |  |  |  |
Loss on lease modification | 2 |  |  |  |  |
Impairment charge for ROU asset | 46 |  |  |  |  |
Facilities closing and contract termination |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring charges, recognized as incurred | 0 | $ 0 |  |  |  |
Restructuring reserve | 7 | $ 5 | 16 |  |  |
Remaining lease term |  | 3 years |  |  |  |
Engineering, selling and administrative expenses | Facilities closing and contract termination |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring charges, recognized as incurred |  |  |  | $ 45 |  |
L3Harris |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring charges, recognized as incurred | 117 | $ 10 | $ 0 | 0 |  |
L3Harris | Workforce reduction |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring charges, recognized as incurred | 117 | 10 |  |  |  |
Restructuring reserve | $ 58 | $ 26 |  |  |  |
Exelis |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring charges, recognized as incurred |  |  |  | $ 5 |  |

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