Goodwill (Details) - USD ($) $ in Millions	6 Months Ended
	Dec. 30, 2016	Jul. 01, 2016
Changes in the carrying amount of goodwill
Balance at July 1, 2016	$ 5,839
Currency translation adjustments	(12)
Other	21
Balance at December 30, 2016	5,848
Communication Systems
Changes in the carrying amount of goodwill
Balance at July 1, 2016	781
Currency translation adjustments	1
Other	2
Balance at December 30, 2016	784
Space and Intelligence Systems
Changes in the carrying amount of goodwill
Balance at July 1, 2016	1,478
Currency translation adjustments	(5)
Other	2
Balance at December 30, 2016	1,475
Electronic Systems
Changes in the carrying amount of goodwill
Balance at July 1, 2016	1,650
Currency translation adjustments	(3)
Other	4
Balance at December 30, 2016	1,651
Critical Networks
Changes in the carrying amount of goodwill
Balance at July 1, 2016	1,930
Currency translation adjustments	(5)
Other	13
Balance at December 30, 2016	1,938
Critical Networks | Discontinued Operations, Held-for-sale | CapRock
Goodwill [Line Items]
Goodwill	0	$ 136
As reported
Changes in the carrying amount of goodwill
Balance at July 1, 2016	5,975
As reported | Communication Systems
Changes in the carrying amount of goodwill
Balance at July 1, 2016	781
As reported | Space and Intelligence Systems
Changes in the carrying amount of goodwill
Balance at July 1, 2016	1,478
As reported | Electronic Systems
Changes in the carrying amount of goodwill
Balance at July 1, 2016	1,650
As reported | Critical Networks
Changes in the carrying amount of goodwill
Balance at July 1, 2016	2,066
Decrease from reclassification to assets of discontinued operations | Discontinued Operations, Held-for-sale | CapRock
Changes in the carrying amount of goodwill
Balance at July 1, 2016	(136)
Decrease from reclassification to assets of discontinued operations | Communication Systems | Discontinued Operations, Held-for-sale | CapRock
Changes in the carrying amount of goodwill
Balance at July 1, 2016	0
Decrease from reclassification to assets of discontinued operations | Space and Intelligence Systems | Discontinued Operations, Held-for-sale | CapRock
Changes in the carrying amount of goodwill
Balance at July 1, 2016	0
Decrease from reclassification to assets of discontinued operations | Electronic Systems | Discontinued Operations, Held-for-sale | CapRock
Changes in the carrying amount of goodwill
Balance at July 1, 2016	0
Decrease from reclassification to assets of discontinued operations | Critical Networks | Discontinued Operations, Held-for-sale | CapRock
Changes in the carrying amount of goodwill
Balance at July 1, 2016	$ (136)