Goodwill (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
	Jul. 01, 2016	Mar. 31, 2017	Apr. 01, 2016	Mar. 31, 2017	Jan. 26, 2017
Changes in the carrying amount of goodwill
Balance at July 1, 2016				$ 5,352
Currency translation adjustments				(7)
Other				22
Balance at March 31, 2017	$ 5,352	$ 5,367		5,367
Discontinued Operations, Held-for-sale
Changes in the carrying amount of goodwill
Goodwill, discontinued operations	623	0		0
Goodwill, current assets discontinued operations	0	259		259
Discontinued Operations, Held-for-sale | CapRock
Goodwill [Line Items]
Decrease from reclassification to assets of discontinued operations	(623)
Transfer of goodwill in segment realignment	0
Communication Systems
Changes in the carrying amount of goodwill
Balance at July 1, 2016				781
Currency translation adjustments				2
Other				2
Balance at March 31, 2017	781	785		785
Communication Systems | Discontinued Operations, Held-for-sale | CapRock
Goodwill [Line Items]
Decrease from reclassification to assets of discontinued operations	0
Transfer of goodwill in segment realignment	0
Space and Intelligence Systems
Changes in the carrying amount of goodwill
Balance at July 1, 2016				1,478
Currency translation adjustments				(3)
Other				2
Balance at March 31, 2017	1,478	1,477		1,477
Space and Intelligence Systems | Discontinued Operations, Held-for-sale | CapRock
Goodwill [Line Items]
Decrease from reclassification to assets of discontinued operations	0
Transfer of goodwill in segment realignment	0
Electronic Systems
Changes in the carrying amount of goodwill
Balance at July 1, 2016				3,093
Currency translation adjustments				(6)
Other				18
Balance at March 31, 2017	3,093	3,105		3,105
Electronic Systems | Discontinued Operations, Held-for-sale | CapRock
Goodwill [Line Items]
Decrease from reclassification to assets of discontinued operations	0
Transfer of goodwill in segment realignment	1,443
Electronic Systems | Discontinued Operations, Held-for-sale | IT Services Business
Changes in the carrying amount of goodwill
Goodwill, discontinued operations					$ 487
Impairment of goodwill		228
Electronic Systems | Discontinued Operations, Disposed of by Sale | CapRock
Changes in the carrying amount of goodwill
Goodwill, discontinued operations	1,443
Impairment of goodwill			$ 290
Critical Networks
Changes in the carrying amount of goodwill
Balance at July 1, 2016				0
Currency translation adjustments				0
Other				0
Balance at March 31, 2017	0	0		0
Critical Networks | Discontinued Operations, Held-for-sale | CapRock
Goodwill [Line Items]
Decrease from reclassification to assets of discontinued operations	(623)
Transfer of goodwill in segment realignment	(1,443)
Critical Networks | Discontinued Operations, Held-for-sale | IT Services Business
Changes in the carrying amount of goodwill
Other		487
Goodwill, discontinued operations	487	0		0
Impairment of goodwill				228
Goodwill, current assets discontinued operations	0	259		259
Critical Networks | Discontinued Operations, Disposed of by Sale | CapRock
Changes in the carrying amount of goodwill
Goodwill, discontinued operations	136	$ 0		0
As reported
Changes in the carrying amount of goodwill
Balance at July 1, 2016				5,975
Balance at March 31, 2017	5,975
As reported | Communication Systems
Changes in the carrying amount of goodwill
Balance at July 1, 2016				781
Balance at March 31, 2017	781
As reported | Space and Intelligence Systems
Changes in the carrying amount of goodwill
Balance at July 1, 2016				1,478
Balance at March 31, 2017	1,478
As reported | Electronic Systems
Changes in the carrying amount of goodwill
Balance at July 1, 2016				1,650
Balance at March 31, 2017	1,650
As reported | Critical Networks
Changes in the carrying amount of goodwill
Balance at July 1, 2016				$ 2,066
Balance at March 31, 2017	$ 2,066