Business Segment Information - Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended
	Sep. 28, 2018	Sep. 29, 2017
Disaggregation of Revenue [Line Items]
Revenue	$ 1,542	$ 1,410
Communication Systems
Disaggregation of Revenue [Line Items]
Revenue	469	406
Communication Systems | United States
Disaggregation of Revenue [Line Items]
Revenue	259	208
Communication Systems | International
Disaggregation of Revenue [Line Items]
Revenue	210	198
Electronic Systems
Disaggregation of Revenue [Line Items]
Revenue	589	541
Electronic Systems | Fixed-price
Disaggregation of Revenue [Line Items]
Revenue	478	422
Electronic Systems | Cost-reimbursable
Disaggregation of Revenue [Line Items]
Revenue	111	119
Electronic Systems | Prime contractor
Disaggregation of Revenue [Line Items]
Revenue	394	398
Electronic Systems | Subcontractor
Disaggregation of Revenue [Line Items]
Revenue	195	143
Electronic Systems | United States
Disaggregation of Revenue [Line Items]
Revenue	478	426
Electronic Systems | International
Disaggregation of Revenue [Line Items]
Revenue	111	115
Space and Intelligence Systems
Disaggregation of Revenue [Line Items]
Revenue	488	466
Space and Intelligence Systems | Fixed-price
Disaggregation of Revenue [Line Items]
Revenue	172	123
Space and Intelligence Systems | Cost-reimbursable
Disaggregation of Revenue [Line Items]
Revenue	316	343
Space and Intelligence Systems | Prime contractor
Disaggregation of Revenue [Line Items]
Revenue	352	334
Space and Intelligence Systems | Subcontractor
Disaggregation of Revenue [Line Items]
Revenue	136	132
Space and Intelligence Systems | United States
Disaggregation of Revenue [Line Items]
Revenue	476	452
Space and Intelligence Systems | International
Disaggregation of Revenue [Line Items]
Revenue	$ 12	$ 14