Business Segment Information - Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended
	Sep. 27, 2019	Sep. 28, 2018
Disaggregation of Revenue [Line Items]
Revenue	$ 4,431	$ 1,542
Integrated Mission Systems | Transferred Over Time
Disaggregation of Revenue [Line Items]
Revenue	1,303	12
Integrated Mission Systems | Transferred Over Time | United States
Disaggregation of Revenue [Line Items]
Revenue	1,074	9
Integrated Mission Systems | Transferred Over Time | International
Disaggregation of Revenue [Line Items]
Revenue	229	3
Integrated Mission Systems | Transferred Over Time | Fixed-price
Disaggregation of Revenue [Line Items]
Revenue	1,021	12
Integrated Mission Systems | Transferred Over Time | Cost-reimbursable
Disaggregation of Revenue [Line Items]
Revenue	282	0
Integrated Mission Systems | Transferred Over Time | Prime contractor
Disaggregation of Revenue [Line Items]
Revenue	890	6
Integrated Mission Systems | Transferred Over Time | Subcontractor
Disaggregation of Revenue [Line Items]
Revenue	413	6
Space and Airborne Systems | Transferred Over Time
Disaggregation of Revenue [Line Items]
Revenue	1,162	840
Space and Airborne Systems | Transferred Over Time | United States
Disaggregation of Revenue [Line Items]
Revenue	1,015	714
Space and Airborne Systems | Transferred Over Time | International
Disaggregation of Revenue [Line Items]
Revenue	147	126
Space and Airborne Systems | Transferred Over Time | Fixed-price
Disaggregation of Revenue [Line Items]
Revenue	691	473
Space and Airborne Systems | Transferred Over Time | Cost-reimbursable
Disaggregation of Revenue [Line Items]
Revenue	471	367
Space and Airborne Systems | Transferred Over Time | Prime contractor
Disaggregation of Revenue [Line Items]
Revenue	697	510
Space and Airborne Systems | Transferred Over Time | Subcontractor
Disaggregation of Revenue [Line Items]
Revenue	465	330
Communication Systems | Transferred at Point in Time and Over Time
Disaggregation of Revenue [Line Items]
Revenue	1,032	480
Communication Systems | Transferred at Point in Time and Over Time | United States
Disaggregation of Revenue [Line Items]
Revenue	721	221
Communication Systems | Transferred at Point in Time and Over Time | International
Disaggregation of Revenue [Line Items]
Revenue	311	259
Communication Systems | Transferred at Point in Time and Over Time | Fixed-price
Disaggregation of Revenue [Line Items]
Revenue	875
Communication Systems | Transferred at Point in Time and Over Time | Cost-reimbursable
Disaggregation of Revenue [Line Items]
Revenue	157
Communication Systems | Transferred at Point in Time and Over Time | Prime contractor
Disaggregation of Revenue [Line Items]
Revenue	679
Communication Systems | Transferred at Point in Time and Over Time | Subcontractor
Disaggregation of Revenue [Line Items]
Revenue	353
Aviation Systems | Transferred at Point in Time and Over Time
Disaggregation of Revenue [Line Items]
Revenue	948	172
Aviation Systems | Transferred at Point in Time and Over Time | United States
Disaggregation of Revenue [Line Items]
Revenue	724	162
Aviation Systems | Transferred at Point in Time and Over Time | International
Disaggregation of Revenue [Line Items]
Revenue	224	10
Aviation Systems | Transferred at Point in Time and Over Time | Fixed-price
Disaggregation of Revenue [Line Items]
Revenue	784	152
Aviation Systems | Transferred at Point in Time and Over Time | Cost-reimbursable
Disaggregation of Revenue [Line Items]
Revenue	164	20
Aviation Systems | Transferred at Point in Time and Over Time | Prime contractor
Disaggregation of Revenue [Line Items]
Revenue	584	168
Aviation Systems | Transferred at Point in Time and Over Time | Subcontractor
Disaggregation of Revenue [Line Items]
Revenue	$ 364	$ 4