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Business Segment Information - Revenues and Income From Continuing Operations by Segment (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Oct. 01, 2021 | Oct. 02, 2020 | Oct. 01, 2021 | Oct. 02, 2020
Segment Reporting Information [Line Items] |  |  |  |
Revenue | $ 4,229 | $ 4,463 | $ 13,464 | $ 13,534
Unallocated Items: |  |  |  |
L3Harris Merger-related integration expenses | (34) | (27) | (75) | (95)
Amortization of acquisition-related intangibles | (155) | (176) | (475) | (529)
Additional cost of sales related to fair value step-up in inventory sold | 0 | 0 | 0 | (31)
Business divestiture-related gains (losses) | 27 | (10) | 192 | (62)
Other items | (8) | (2) | (61) | (19)
Impairment of goodwill and other assets | 0 | 0 | (125) | (19)
Unallocated corporate department expense | (2) | (21) | (59) | (51)
Total unallocated expenses | (172) | (236) | (603) | (806)
Pension adjustment | (111) | (97) | (336) | (292)
Non-operating income, net | 111 | 96 | 314 | 296
Interest expense, net | (67) | (62) | (198) | (190)
Income from continuing operations before income taxes | 586 | 518 | 1,695 | 1,075
Operating segments |  |  |  |
Income From Continuing Operations Before Income Taxes |  |  |  |
Segment operating income (loss) | 825 | 817 | 2,518 | 2,067
Operating segments | Integrated Mission Systems |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue | 1,336 | 1,372 | 4,281 | 4,073
Income From Continuing Operations Before Income Taxes |  |  |  |
Segment operating income (loss) | 222 | 213 | 691 | 638
Operating segments | Space and Airborne Systems |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue | 1,284 | 1,249 | 3,807 | 3,690
Income From Continuing Operations Before Income Taxes |  |  |  |
Segment operating income (loss) | 242 | 231 | 735 | 687
Operating segments | Communication Systems |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue | 1,030 | 1,094 | 3,269 | 3,300
Income From Continuing Operations Before Income Taxes |  |  |  |
Segment operating income (loss) | 271 | 273 | 839 | 788
Operating segments | Aviation Systems |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue | 625 | 792 | 2,248 | 2,603
Income From Continuing Operations Before Income Taxes |  |  |  |
Segment operating income (loss) | 90 | 100 | 253 | (46)
Corporate eliminations |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue | $ (46) | $ (44) | $ (141) | $ (132)

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