BUSINESS SEGMENTS - Total Assets by Segment (Details) - USD ($) $ in Millions	Dec. 31, 2021	Jan. 01, 2021
Segment Reporting Information [Line Items]
Assets	$ 34,709	$ 36,960
Identifiable intangible assets acquired	6,640	7,908
Operating segments | Integrated Mission Systems
Segment Reporting Information [Line Items]
Assets	9,269	8,906
Operating segments | Space & Airborne Systems
Segment Reporting Information [Line Items]
Assets	7,190	6,943
Operating segments | Communication Systems
Segment Reporting Information [Line Items]
Assets	6,035	5,746
Operating segments | Aviation Systems
Segment Reporting Information [Line Items]
Assets	3,531	5,026
Corporate eliminations
Segment Reporting Information [Line Items]
Assets	8,684	10,339
Identifiable intangible assets acquired	$ 6,600	$ 7,900