BUSINESS SEGMENTS - Revenues and Income From Continuing Operations by Segment (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 30, 2022	Dec. 31, 2021	Jan. 01, 2021
Segment Reporting Information [Line Items]
Revenue	$ 17,062	$ 17,814	$ 18,194
Income from Continuing Operations before Income Taxes
Segment Operating Income (Loss)	1,826	2,774	2,162
Unallocated Items [Abstract]
Unallocated corporate department expense, net	25	(51)	(69)
Amortization of acquisition-related intangibles	(605)	(627)	(709)
L3Harris Merger-related integration expenses	(90)	(134)	(140)
Acquisition-related transaction and integration expenses	(9)	0	0
Pre-acquisition and other divestiture-related expenses	(63)	(71)	10
Additional cost of sales related to fair value step-up in inventory sold	0	0	(31)
Business divestiture-related gains (losses), net	0	220	(51)
Gain on sale of asset group	8	0	0
Impairment of goodwill and other assets	0	(125)	(132)
Charges for severance and other termination costs	(29)	0	0
Charges related to an additional pre-merger legal contingency	(31)	0	0
FAS/CAS pension adjustment	95	123	135
Total unallocated expenses	(699)	(665)	(987)
Non-operating income, net	425	439	401
Net interest expense	(279)	(265)	(254)
Income from continuing operations before income taxes	1,273	2,283	1,322
Income from emission reduction projects	13
Goodwill impairment	802	62
FAS pension service cost	(46)	(68)
FAS/CAS operating adjustment	95	123	135
Pension Plan
Unallocated Items [Abstract]
Deferred compensation plan income (loss)	29
FAS pension service cost	(44)	(66)	(65)
Plans Under US Government Contracts | Pension Plan
Unallocated Items [Abstract]
FAS/CAS pension adjustment	95	123	135
FAS pension service cost	(46)	(68)	(67)
Less: CAS pension cost	(141)	(191)	(202)
FAS/CAS operating adjustment	95	123	135
Non-service FAS pension income	441	445	388
FAS/CAS pension adjustment, net	536	568	523
CAS
Unallocated Items [Abstract]
Impairment of intangible assets			113
Disposal Group, Disposed of by Sale, Not Discontinued Operations
Unallocated Items [Abstract]
Gain on sale of asset group	8
Disposal Group, Disposed of by Sale, Not Discontinued Operations | CPS business
Unallocated Items [Abstract]
Goodwill impairment		62
Disposal Group, Disposed of by Sale, Not Discontinued Operations | CTS
Unallocated Items [Abstract]
Impairment of identifiable assets		63
Disposal Group, Disposed of by Sale, Not Discontinued Operations | VSE disposal group
Unallocated Items [Abstract]
Goodwill impairment			14
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Applied Kilovolts Business
Unallocated Items [Abstract]
Goodwill impairment			5
Integrated Mission Systems
Unallocated Items [Abstract]
Goodwill impairment	447	0
Space & Airborne Systems
Unallocated Items [Abstract]
Goodwill impairment	0	0
Communication Systems
Unallocated Items [Abstract]
Goodwill impairment	355	0
Operating segments | Integrated Mission Systems
Segment Reporting Information [Line Items]
Revenue	6,916	7,042	6,793
Income from Continuing Operations before Income Taxes
Segment Operating Income (Loss)	424	866	205
Operating segments | Space & Airborne Systems
Segment Reporting Information [Line Items]
Revenue	6,060	5,965	5,823
Income from Continuing Operations before Income Taxes
Segment Operating Income (Loss)	735	761	762
Operating segments | Communication Systems
Segment Reporting Information [Line Items]
Revenue	4,217	4,287	4,402
Income from Continuing Operations before Income Taxes
Segment Operating Income (Loss)	667	1,043	1,035
Other non-reportable business segments
Segment Reporting Information [Line Items]
Revenue	0	683	1,347
Income from Continuing Operations before Income Taxes
Segment Operating Income (Loss)	0	104	160
Corporate non-segment
Segment Reporting Information [Line Items]
Revenue	$ (131)	$ (163)	$ (171)