Business Segment Information - Assets by Segment (Details) - USD ($) $ in Millions	Mar. 29, 2019	Jun. 29, 2018
Segment Reporting Information [Line Items]
Assets	$ 9,792	$ 9,851
Identifiable intangible assets	902	989
Operating Segments | Communication Systems
Segment Reporting Information [Line Items]
Assets	1,562	1,567
Operating Segments | Electronic Systems
Segment Reporting Information [Line Items]
Assets	4,251	4,174
Operating Segments | Space and Intelligence Systems
Segment Reporting Information [Line Items]
Assets	2,216	2,193
Corporate
Segment Reporting Information [Line Items]
Assets	1,763	1,917
Corporate | Exelis
Segment Reporting Information [Line Items]
Identifiable intangible assets	$ 898	$ 974