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GOODWILL - Narrative (Details) - USD ($) |  | 3 Months Ended | 6 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Jun. 29, 2019 | Jan. 01, 2021 | Jul. 03, 2020 | Jan. 03, 2020 | Dec. 28, 2018 | Oct. 02, 2020 | Jan. 01, 2021 | Jan. 03, 2020 | Jun. 28, 2019 | Jun. 29, 2018
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |  |
Goodwill impairment loss | $ 0 |  |  |  |  | $ 480,000,000 |  |  |  |
Non-cash impairment charges of long-lived assets |  |  |  | $ 46,000,000 | $ 0 |  | $ 767,000,000 | $ 46,000,000 | $ 0 | $ 0
Impairment of identifiable intangible assets |  |  |  | 0 |  |  | 113,000,000 |  | 0 | 0
Impairment of marketable software |  |  |  | $ 46,000,000 |  |  | 767,000,000 |  | $ 0 | $ 0
Aviation Systems |  |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |  |
Goodwill impairment loss |  |  |  |  |  | $ 475,000,000 |  |  |  |
Aviation Systems | VSE | Disposal Group, Held-for-sale, Not Discontinued Operations |  |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |  |
Goodwill assigned to disposal group |  |  | $ 14,000,000 |  |  |  |  |  |  |
Commercial Aviation Solutions |  |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |  |
Non-cash impairment charges of long-lived assets |  |  |  |  |  |  | 257,000,000 |  |  |
Impairment of identifiable intangible assets |  | $ 113,000,000 |  |  |  |  |  |  |  |
Impairment of property, plant and equipment |  |  |  |  |  |  | 103,000,000 |  |  |
Commercial Aviation Solutions | COVID |  |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |  |
Goodwill impairment loss |  | $ 111,000,000 |  |  |  |  | 461,000,000 |  |  |
Goodwill impairment loss attributable to noncontrolling interests |  |  |  |  |  |  | 34,000,000 |  |  |
Non-cash impairment charges of long-lived assets |  |  |  |  |  |  | 257,000,000 |  |  |
Impairment of identifiable intangible assets |  |  |  |  |  |  | 113,000,000 |  |  |
Impairment of property, plant and equipment |  |  |  |  |  |  | 103,000,000 |  |  |
Impairment charge for ROU asset |  |  |  |  |  |  | 31,000,000 |  |  |
Impairment of marketable software |  |  |  |  |  |  | $ 10,000,000 |  |  |
Aviation Systems | VSE | Disposal Group, Held-for-sale, Not Discontinued Operations |  |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |  |
Goodwill impairment loss |  |  | $ 14,000,000 |  |  |  |  |  |  |

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