Business Segment Information - Total Assets by Segment (Details) - USD ($) $ in Millions	Apr. 03, 2020	Jan. 03, 2020
Segment Reporting Information [Line Items]
Assets	$ 38,105	$ 38,336
Identifiable intangibles assets acquired	8,171	8,458
Corporate
Segment Reporting Information [Line Items]
Assets	9,807	10,112
Corporate | Exelis
Segment Reporting Information [Line Items]
Identifiable intangibles assets acquired	8,200	8,500
Integrated Mission Systems
Segment Reporting Information [Line Items]
Assets	7,999	7,896
Space and Airborne Systems
Segment Reporting Information [Line Items]
Assets	6,948	6,829
Communication Systems
Segment Reporting Information [Line Items]
Assets	5,928	5,930
Aviation Systems
Segment Reporting Information [Line Items]
Assets	$ 7,423	$ 7,569