Business Segment Information - Total Assets by Segment (Details) - USD ($) $ in Millions	Sep. 27, 2019	Jun. 28, 2019
Segment Reporting Information [Line Items]
Assets	$ 38,947	$ 10,117
Identifiable intangibles assets acquired	7,516	870
Corporate
Segment Reporting Information [Line Items]
Assets	9,646	2,284
Corporate | Exelis and L3Harris
Segment Reporting Information [Line Items]
Identifiable intangibles assets acquired	7,500
Corporate | Exelis
Segment Reporting Information [Line Items]
Identifiable intangibles assets acquired		869
Integrated Mission Systems
Segment Reporting Information [Line Items]
Assets	8,666	87
Space and Airborne Systems
Segment Reporting Information [Line Items]
Assets	6,767	5,027
Communication Systems
Segment Reporting Information [Line Items]
Assets	5,145	1,683
Aviation Systems
Segment Reporting Information [Line Items]
Assets	$ 8,723	$ 1,036