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Business Segment Information - Revenues and Income From Continuing Operations by Segment (Details) - USD ($) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jul. 03, 2020 | Sep. 27, 2019 | Jun. 28, 2019 | Jul. 03, 2020 | Jun. 28, 2019
Segment Reporting Information [Line Items] |  |  |  |  |
Revenue | $ 4,445,000,000 |  | $ 1,865,000,000 | $ 9,071,000,000 | $ 3,593,000,000
Income From Continuing Operations Before Income Taxes |  |  |  |  |
Non-operating income | 7,000,000 |  | 2,000,000 | 5,000,000 | 1,000,000
Income from continuing operations before income taxes | 336,000,000 |  | 302,000,000 | 557,000,000 | 585,000,000
Loss on sale of business |  |  |  | 52,000,000 | 0
Non-cash remeasurement loss on potential divestiture |  |  |  | 14,000,000 |
Impairment of goodwill |  | $ 0 |  | 369,000,000 |
Restructuring charges |  |  |  | 22,000,000 |
L3Harris |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenue |  |  | 1,865,000,000 |  | 3,593,000,000
Income From Continuing Operations Before Income Taxes |  |  |  |  |
Amortization of acquisition-related intangibles | (209,000,000) |  |  | (367,000,000) |
Additional cost of sales related to the fair value step-up in inventory sold | 16,000,000 |  | 0 | 31,000,000 | 0
Restructuring charges | 7,000,000 |  |  | 7,000,000 |
Exelis |  |  |  |  |
Income From Continuing Operations Before Income Taxes |  |  |  |  |
Amortization of acquisition-related intangibles |  |  | (27,000,000) |  | (56,000,000)
Integrated Mission Systems |  |  |  |  |
Income From Continuing Operations Before Income Taxes |  |  |  |  |
Impairment of goodwill |  |  |  | 0 |
Space and Airborne Systems |  |  |  |  |
Income From Continuing Operations Before Income Taxes |  |  |  |  |
Impairment of goodwill |  |  |  | 5,000,000 |
Communication Systems |  |  |  |  |
Income From Continuing Operations Before Income Taxes |  |  |  |  |
Impairment of goodwill |  |  |  | 0 |
Aviation Systems |  |  |  |  |
Income From Continuing Operations Before Income Taxes |  |  |  |  |
Impairment of goodwill |  |  |  | 364,000,000 |
Other non-reportable business segments |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenue | 0 |  | 44,000,000 | 0 | 79,000,000
Operating segments | Integrated Mission Systems |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenue | 1,331,000,000 |  | 11,000,000 | 2,701,000,000 | 25,000,000
Income From Continuing Operations Before Income Taxes |  |  |  |  |
Segment operating income | 224,000,000 |  | 3,000,000 | 425,000,000 | 6,000,000
Operating segments | Space and Airborne Systems |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenue | 1,249,000,000 |  | 1,019,000,000 | 2,441,000,000 | 1,975,000,000
Income From Continuing Operations Before Income Taxes |  |  |  |  |
Segment operating income | 235,000,000 |  | 195,000,000 | 456,000,000 | 369,000,000
Operating segments | Communication Systems |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenue | 1,112,000,000 |  | 609,000,000 | 2,206,000,000 | 1,189,000,000
Income From Continuing Operations Before Income Taxes |  |  |  |  |
Segment operating income | 265,000,000 |  | 176,000,000 | 515,000,000 | 343,000,000
Operating segments | Aviation Systems |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenue | 800,000,000 |  | 186,000,000 | 1,811,000,000 | 330,000,000
Income From Continuing Operations Before Income Taxes |  |  |  |  |
Segment operating income | 31,000,000 |  | 19,000,000 | (146,000,000) | 36,000,000
Operating segments | Other non-reportable business segments |  |  |  |  |
Income From Continuing Operations Before Income Taxes |  |  |  |  |
Segment operating income | 0 |  | 8,000,000 | 0 | 14,000,000
Corporate eliminations |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenue | (47,000,000) |  | (4,000,000) | (88,000,000) | (5,000,000)
Unallocated corporate expenses |  |  |  |  |
Income From Continuing Operations Before Income Taxes |  |  |  |  |
Segment operating income | (116,000,000) |  | (1,000,000) | (149,000,000) | (1,000,000)
Divestiture-related expenses | 58,000,000 |  |  | 61,000,000 |
Loss on sale of business |  |  |  | 26,000,000 |
Non-cash adjustment to gain on sale of business |  |  |  | 12,000,000 |
Impairment of goodwill | 14,000,000 |  |  |  |
Unallocated corporate expenses | L3Harris |  |  |  |  |
Income From Continuing Operations Before Income Taxes |  |  |  |  |
Additional cost of sales related to the fair value step-up in inventory sold | 16,000,000 |  |  | 31,000,000 |
Restructuring charges |  |  |  | 7,000,000 |
Unallocated corporate expenses | Disposal Group, Held-for-sale, Not Discontinued Operations | Applied Kilovolts and Analytical Instrumentation Business |  |  |  |  |
Income From Continuing Operations Before Income Taxes |  |  |  |  |
Impairment of goodwill |  |  |  | 5,000,000 |
Segment reconciling items |  |  |  |  |
Income From Continuing Operations Before Income Taxes |  |  |  |  |
L3Harris Merger-related transaction and integration expenses | (37,000,000) |  | (36,000,000) | (68,000,000) | (52,000,000)
Amortization of acquisition-related intangibles | (208,000,000) |  | (25,000,000) | (353,000,000) | (50,000,000)
Pension adjustment | (98,000,000) |  | (46,000,000) | (195,000,000) | (93,000,000)
Non-operating income | 105,000,000 |  | 48,000,000 | 200,000,000 | 94,000,000
Net interest expense | (65,000,000) |  | (39,000,000) | (128,000,000) | (81,000,000)
Segment reconciling items | L3Harris |  |  |  |  |
Income From Continuing Operations Before Income Taxes |  |  |  |  |
Amortization of acquisition-related intangibles | (183,000,000) |  |  | (303,000,000) |
Segment reconciling items | Exelis |  |  |  |  |
Income From Continuing Operations Before Income Taxes |  |  |  |  |
Amortization of acquisition-related intangibles | $ (25,000,000) |  | $ (50,000,000) | $ (25,000,000) | $ (50,000,000)

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