Net Periodic Benefit Cost (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jul. 02, 2016	Jun. 27, 2015	Jul. 02, 2016	Jun. 27, 2015
Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Service costs	$ 80	$ 82	$ 239	$ 248
Interest costs	115	129	344	391
Expected return on plan assets	(186)	(178)	(560)	(534)
Amortization of prior-year service costs	3	4	10	12
Recognized net actuarial loss	61	62	182	185
Net periodic benefit cost	73	99	215	302
Postretirement Medical Plans
Defined Benefit Plan Disclosure [Line Items]
Service costs	2	4	8	11
Interest costs	16	17	46	51
Expected return on plan assets	(12)	(10)	(34)	(29)
Amortization of prior-year service costs	(1)	0	(1)	(1)
Recognized net actuarial loss	2	3	6	8
Net periodic benefit cost	$ 7	$ 14	$ 25	$ 40