Business Segment Information - Total Assets by Segment (Details) - USD ($) $ in Millions	Jul. 03, 2020	Jan. 03, 2020
Segment Reporting Information [Line Items]
Assets	$ 37,852	$ 38,336
Identifiable intangibles assets acquired	8,336	8,458
Corporate
Segment Reporting Information [Line Items]
Assets	11,290	10,112
Corporate | Exelis
Segment Reporting Information [Line Items]
Identifiable intangibles assets acquired	8,300	8,500
Integrated Mission Systems
Segment Reporting Information [Line Items]
Assets	8,675	7,896
Space and Airborne Systems
Segment Reporting Information [Line Items]
Assets	6,899	6,829
Communication Systems
Segment Reporting Information [Line Items]
Assets	5,719	5,930
Aviation Systems
Segment Reporting Information [Line Items]
Assets	$ 5,269	$ 7,569