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BUSINESS SEGMENTS - Revenues and Income From Continuing Operations by Segment (Details) - USD ($) |  | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 29, 2019 | Jan. 03, 2020 | Dec. 28, 2018 | Dec. 31, 2021 | Jan. 01, 2021 | Jan. 03, 2020 | Jun. 28, 2019
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Revenue |  | $ 9,263,000,000 | $ 3,208,000,000 | $ 17,814,000,000 | $ 18,194,000,000 | $ 12,856,000,000 | $ 6,801,000,000
Income from Continuing Operations before Income Taxes |  |  |  |  |  |  |
Segment Operating Income (Loss) |  | 1,600,000,000 |  | 3,342,000,000 | 2,686,000,000 |  | 1,446,000,000
Unallocated Items [Abstract] |  |  |  |  |  |  |
Unallocated corporate department expense, net |  | 3,000,000 |  | (57,000,000) | (69,000,000) |  | (2,000,000)
L3Harris Merger-related transaction, integration and other expenses and losses |  | (390,000,000) |  | (128,000,000) | (140,000,000) |  | (65,000,000)
Amortization of acquisition-related intangibles |  | (289,000,000) |  | (627,000,000) | (709,000,000) |  | (101,000,000)
Additional cost of sales related to fair value step-up in inventory sold |  | (142,000,000) |  | 0 | (31,000,000) |  | 0
Business divestiture-related gains (losses) |  | 229,000,000 | 0 | 220,000,000 | (51,000,000) | 229,000,000 | 0
Impairment of goodwill and other assets |  | 0 |  | (125,000,000) | (132,000,000) |  | 0
Other items |  | 0 |  | (71,000,000) | 10,000,000 |  | 0
Total unallocated expenses |  | (589,000,000) |  | (788,000,000) | (1,122,000,000) |  | (168,000,000)
Pension adjustment |  | (172,000,000) |  | (445,000,000) | (389,000,000) |  | (186,000,000)
Non-operating income |  | 192,000,000 |  | 439,000,000 | 401,000,000 |  | 188,000,000
Net interest expense |  | (123,000,000) | (86,000,000) | (265,000,000) | (254,000,000) | (204,000,000) | (167,000,000)
Income from continuing operations before income taxes |  | 908,000,000 | $ 528,000,000 | 2,283,000,000 | 1,322,000,000 | $ 1,493,000,000 | 1,113,000,000
Goodwill impairment | $ 0 |  |  | 62,000,000 | 480,000,000 |  |
Disposal Group, Disposed of by Sale, Not Discontinued Operations | CPS business |  |  |  |  |  |  |
Unallocated Items [Abstract] |  |  |  |  |  |  |
Goodwill impairment |  |  |  | 62,000,000 |  |  |
Disposal Group, Disposed of by Sale, Not Discontinued Operations | CTS |  |  |  |  |  |  |
Unallocated Items [Abstract] |  |  |  |  |  |  |
Impairment of identifiable assets |  |  |  | 63,000,000 |  |  |
Disposal Group, Disposed of by Sale, Not Discontinued Operations | VSE disposal group |  |  |  |  |  |  |
Unallocated Items [Abstract] |  |  |  |  |  |  |
Goodwill impairment |  |  |  |  | 14,000,000 |  |
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Applied Kilovolts Business |  |  |  |  |  |  |
Unallocated Items [Abstract] |  |  |  |  |  |  |
Goodwill impairment |  |  |  |  | 5,000,000 |  |
Integrated Mission Systems |  |  |  |  |  |  |
Unallocated Items [Abstract] |  |  |  |  |  |  |
Goodwill impairment |  |  |  | 0 | 0 |  |
Space & Airborne Systems |  |  |  |  |  |  |
Unallocated Items [Abstract] |  |  |  |  |  |  |
Goodwill impairment |  |  |  | 0 | 5,000,000 |  |
Communication Systems |  |  |  |  |  |  |
Unallocated Items [Abstract] |  |  |  |  |  |  |
Goodwill impairment |  |  |  | 0 | 0 |  |
Aviation Systems |  |  |  |  |  |  |
Unallocated Items [Abstract] |  |  |  |  |  |  |
Goodwill impairment |  |  |  | 62,000,000 | 475,000,000 |  |
Operating segments | Integrated Mission Systems |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Revenue |  | 2,758,000,000 |  | 5,839,000,000 | 5,538,000,000 |  | 52,000,000
Income from Continuing Operations before Income Taxes |  |  |  |  |  |  |
Segment Operating Income (Loss) |  | 371,000,000 |  | 950,000,000 | 847,000,000 |  | 10,000,000
Operating segments | Space & Airborne Systems |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Revenue |  | 2,377,000,000 |  | 5,093,000,000 | 4,946,000,000 |  | 3,711,000,000
Income from Continuing Operations before Income Taxes |  |  |  |  |  |  |
Segment Operating Income (Loss) |  | 447,000,000 |  | 970,000,000 | 932,000,000 |  | 696,000,000
Operating segments | Communication Systems |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Revenue |  | 2,151,000,000 |  | 4,287,000,000 | 4,443,000,000 |  | 2,208,000,000
Income from Continuing Operations before Income Taxes |  |  |  |  |  |  |
Segment Operating Income (Loss) |  | 493,000,000 |  | 1,092,000,000 | 1,084,000,000 |  | 637,000,000
Operating segments | Aviation Systems |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Revenue |  | 2,038,000,000 |  | 2,783,000,000 | 3,448,000,000 |  | 672,000,000
Income from Continuing Operations before Income Taxes |  |  |  |  |  |  |
Segment Operating Income (Loss) |  | 289,000,000 |  | 330,000,000 | (177,000,000) |  | 76,000,000
Other non-reportable business segments |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Revenue |  | 23,000,000 |  | 0 | 0 |  | 165,000,000
Income from Continuing Operations before Income Taxes |  |  |  |  |  |  |
Segment Operating Income (Loss) |  | 0 |  | 0 | 0 |  | 27,000,000
Corporate eliminations |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Revenue |  | $ (84,000,000) |  | $ (188,000,000) | $ (181,000,000) |  | $ (7,000,000)

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