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Business Segment Information - Revenues and Income From Continuing Operations by Segment (Details) - USD ($) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Oct. 02, 2020 | Jul. 03, 2020 | Sep. 27, 2019 | Oct. 02, 2020 | Sep. 27, 2019
Segment Reporting Information [Line Items] |  |  |  |  |
Revenue | $ 4,463,000,000 |  | $ 4,431,000,000 | $ 13,534,000,000 | $ 8,024,000,000
Income From Continuing Operations Before Income Taxes |  |  |  |  |
L3Harris Merger-related transaction and integration expenses | (27,000,000) |  | (170,000,000) | (95,000,000) | (222,000,000)
Restructuring charges |  |  |  | (24,000,000) |
Amortization of acquisition-related intangibles | (179,000,000) |  | (125,000,000) | (546,000,000) | (181,000,000)
Business divestiture-related (losses) gains | (10,000,000) |  | 229,000,000 | (62,000,000) | 229,000,000
Pension adjustment | (97,000,000) |  | (80,000,000) | (292,000,000) | (173,000,000)
Non-operating income | 96,000,000 |  | 79,000,000 | 296,000,000 | 173,000,000
Net interest expense | (62,000,000) |  | (58,000,000) | (190,000,000) | (139,000,000)
Income from continuing operations before income taxes | 518,000,000 |  | 440,000,000 | 1,075,000,000 | 1,025,000,000
Non-cash goodwill impairment charge |  |  | 0 | 369,000,000 |
L3Harris and Exelis |  |  |  |  |
Income From Continuing Operations Before Income Taxes |  |  |  |  |
Amortization of acquisition-related intangibles | (176,000,000) |  | (123,000,000) | (529,000,000) | (173,000,000)
L3Harris |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenue |  |  |  |  | 8,024,000,000
Income From Continuing Operations Before Income Taxes |  |  |  |  |
Restructuring charges | 0 | $ (7,000,000) | (111,000,000) | (7,000,000) | (111,000,000)
Amortization of acquisition-related intangibles | (151,000,000) |  | (98,000,000) | (454,000,000) | (98,000,000)
Additional costs of sale related to fair value step-up in inventory sold | 0 |  | 92,000,000 | 31,000,000 | 92,000,000
Exelis |  |  |  |  |
Income From Continuing Operations Before Income Taxes |  |  |  |  |
Amortization of acquisition-related intangibles | (25,000,000) |  | (25,000,000) | (75,000,000) | (75,000,000)
Disposal Group, Disposed of by Sale, Not Discontinued Operations |  |  |  |  |
Income From Continuing Operations Before Income Taxes |  |  |  |  |
Business divestiture-related (losses) gains |  |  |  | (296,000,000) |
Integrated Mission Systems |  |  |  |  |
Income From Continuing Operations Before Income Taxes |  |  |  |  |
Non-cash goodwill impairment charge |  |  |  | 0 |
Space and Airborne Systems |  |  |  |  |
Income From Continuing Operations Before Income Taxes |  |  |  |  |
Non-cash goodwill impairment charge |  |  |  | 5,000,000 |
Communication Systems |  |  |  |  |
Income From Continuing Operations Before Income Taxes |  |  |  |  |
Non-cash goodwill impairment charge |  |  |  | 0 |
Aviation Systems |  |  |  |  |
Income From Continuing Operations Before Income Taxes |  |  |  |  |
Non-cash goodwill impairment charge |  |  |  | 364,000,000 |
Operating segments | Integrated Mission Systems |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenue | 1,372,000,000 |  | 1,292,000,000 | 4,073,000,000 | 1,317,000,000
Income From Continuing Operations Before Income Taxes |  |  |  |  |
Segment operating income | 213,000,000 |  | 176,000,000 | 638,000,000 | 182,000,000
Operating segments | Space and Airborne Systems |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenue | 1,249,000,000 |  | 1,173,000,000 | 3,690,000,000 | 3,148,000,000
Income From Continuing Operations Before Income Taxes |  |  |  |  |
Segment operating income | 231,000,000 |  | 230,000,000 | 687,000,000 | 599,000,000
Operating segments | Communication Systems |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenue | 1,094,000,000 |  | 1,032,000,000 | 3,300,000,000 | 2,221,000,000
Income From Continuing Operations Before Income Taxes |  |  |  |  |
Segment operating income | 273,000,000 |  | 234,000,000 | 788,000,000 | 577,000,000
Operating segments | Aviation Systems |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenue | 792,000,000 |  | 948,000,000 | 2,603,000,000 | 1,278,000,000
Income From Continuing Operations Before Income Taxes |  |  |  |  |
Segment operating income | 100,000,000 |  | 127,000,000 | (46,000,000) | 163,000,000
Operating segments | Other non-reportable business segments |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenue | 0 |  | 23,000,000 | 0 | 102,000,000
Income From Continuing Operations Before Income Taxes |  |  |  |  |
Segment operating income | 0 |  | 0 | 0 | 14,000,000
Corporate eliminations |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenue | (44,000,000) |  | (37,000,000) | (132,000,000) | (42,000,000)
Unallocated corporate expenses |  |  |  |  |
Income From Continuing Operations Before Income Taxes |  |  |  |  |
Segment operating income | (23,000,000) |  | (93,000,000) | (113,000,000) | (94,000,000)
Divestiture-related expenses | $ 2,000,000 |  |  | 11,000,000 |
Non-cash cumulative adjustment to lease expense |  |  | 12,000,000 |  | 12,000,000
Unallocated corporate expenses | L3Harris |  |  |  |  |
Income From Continuing Operations Before Income Taxes |  |  |  |  |
Additional costs of sale related to fair value step-up in inventory sold |  |  | 92,000,000 | 31,000,000 | 92,000,000
Unallocated corporate expenses | Disposal Group, Held-for-sale, Not Discontinued Operations |  |  |  |  |
Income From Continuing Operations Before Income Taxes |  |  |  |  |
Non-cash goodwill impairment charge |  |  |  | 14,000,000 |
Unallocated corporate expenses | Disposal Group, Disposed of by Sale, Not Discontinued Operations |  |  |  |  |
Income From Continuing Operations Before Income Taxes |  |  |  |  |
Gain on sale of asset group |  |  | $ 12,000,000 |  | $ 12,000,000
Unallocated corporate expenses | Disposal Group, Disposed of by Sale, Not Discontinued Operations | Applied Kilovolts and Analytical Instrumentation Business |  |  |  |  |
Income From Continuing Operations Before Income Taxes |  |  |  |  |
Non-cash goodwill impairment charge |  |  |  | $ 5,000,000 |

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