Postretirement Benefit Plans (Details Textual1) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Jan. 01, 2016	Jan. 01, 2016
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 22	$ 41
Interest cost	64	130
Expected return on plan assets	(89)	(180)
Amortization of net actuarial loss		2
Amortization of prior service cost	(4)	(7)
Net periodic benefit cost	(7)	(14)
Effect of curtailments or settlements	(121)	(121)
Total net periodic benefit cost	(128)	(135)
Pension
Defined Benefit Plan Disclosure [Line Items]
Service cost	20	38
Interest cost	61	123
Expected return on plan assets	(85)	(171)
Net periodic benefit cost	(4)	(10)
Total net periodic benefit cost	(4)	(10)
Other Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	2	3
Interest cost	3	7
Expected return on plan assets	(4)	(9)
Amortization of net actuarial loss		2
Amortization of prior service cost	(4)	(7)
Net periodic benefit cost	(3)	(4)
Effect of curtailments or settlements	(121)	(121)
Total net periodic benefit cost	$ (124)	$ (125)