Postretirement Benefit Plans - Components of Periodic Benefit Costs (Details) - USD ($) $ in Millions	3 Months Ended
	Sep. 29, 2017	Sep. 30, 2016
Net periodic benefit income
Service cost	$ 10	$ 15
Interest cost	50	48
Expected return on plan assets	(96)	(89)
Total net periodic benefit income	(36)	(26)
Discontinued operations, net of income taxes
Net periodic benefit income
Total net periodic benefit income		1
Pension
Net periodic benefit income
Service cost	10	15
Interest cost	48	46
Expected return on plan assets	(92)	(85)
Total net periodic benefit income	(34)	(24)
Other Benefits
Net periodic benefit income
Service cost	0	0
Interest cost	2	2
Expected return on plan assets	(4)	(4)
Total net periodic benefit income	$ (2)	$ (2)