Business Segment Information - Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Mar. 29, 2019	Mar. 30, 2018	Mar. 29, 2019	Mar. 30, 2018
Disaggregation of Revenue [Line Items]
Revenue	$ 1,728	$ 1,562	$ 4,936	$ 4,507
Communication Systems
Disaggregation of Revenue [Line Items]
Revenue	568	479	1,577	1,377
Communication Systems | United States
Disaggregation of Revenue [Line Items]
Revenue	324	232	882	716
Communication Systems | International
Disaggregation of Revenue [Line Items]
Revenue	244	247	695	661
Electronic Systems
Disaggregation of Revenue [Line Items]
Revenue	649	606	1,855	1,729
Electronic Systems | Fixed-price
Disaggregation of Revenue [Line Items]
Revenue	515	491	1,501	1,376
Electronic Systems | Cost-reimbursable
Disaggregation of Revenue [Line Items]
Revenue	134	115	354	353
Electronic Systems | Prime contractor
Disaggregation of Revenue [Line Items]
Revenue	402	426	1,195	1,234
Electronic Systems | Subcontractor
Disaggregation of Revenue [Line Items]
Revenue	247	180	660	495
Electronic Systems | United States
Disaggregation of Revenue [Line Items]
Revenue	539	491	1,503	1,381
Electronic Systems | International
Disaggregation of Revenue [Line Items]
Revenue	110	115	352	348
Space and Intelligence Systems
Disaggregation of Revenue [Line Items]
Revenue	514	482	1,515	1,410
Space and Intelligence Systems | Fixed-price
Disaggregation of Revenue [Line Items]
Revenue	173	140	533	383
Space and Intelligence Systems | Cost-reimbursable
Disaggregation of Revenue [Line Items]
Revenue	341	342	982	1,027
Space and Intelligence Systems | Prime contractor
Disaggregation of Revenue [Line Items]
Revenue	355	353	1,069	1,016
Space and Intelligence Systems | Subcontractor
Disaggregation of Revenue [Line Items]
Revenue	159	129	446	394
Space and Intelligence Systems | United States
Disaggregation of Revenue [Line Items]
Revenue	504	466	1,480	1,364
Space and Intelligence Systems | International
Disaggregation of Revenue [Line Items]
Revenue	$ 10	$ 16	$ 35	$ 46