Postretirement Benefit Plans - Components of Periodic Benefit Costs (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Apr. 01, 2016	Apr. 01, 2016	Apr. 03, 2015
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 19	$ 60
Interest cost	66	196
Expected return on plan assets	(91)	(271)
Amortization of net actuarial loss	0	2
Amortization of prior service cost	0	(7)
Net periodic benefit income	(6)	(20)
Effect of curtailments or settlements	0	(121)
Total net periodic benefit income	(6)	(141)
Net liability reduction for certain post-employment benefit plans		(101)	$ 0
Pension
Defined Benefit Plan Disclosure [Line Items]
Service cost	18	56
Interest cost	63	186
Expected return on plan assets	(87)	(258)
Amortization of net actuarial loss	0	0
Amortization of prior service cost	0	0
Net periodic benefit income	(6)	(16)
Effect of curtailments or settlements	0	0
Total net periodic benefit income	(6)	(16)
Other Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	1	4
Interest cost	3	10
Expected return on plan assets	(4)	(13)
Amortization of net actuarial loss	0	2
Amortization of prior service cost	0	(7)
Net periodic benefit income	0	(4)
Effect of curtailments or settlements	0	(121)
Total net periodic benefit income	$ 0	(125)
Net liability reduction for certain post-employment benefit plans		$ (101)