Components of Net Periodic Benefit Cost (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Jun. 29, 2013	Jun. 30, 2012	Jun. 29, 2013	Jun. 30, 2012
Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 86	$ 69	$ 258	$ 208
Interest cost	109	111	326	330
Expected return on plan assets	(151)	(128)	(452)	(385)
Amortization of prior-year service costs	2	3	7	10
Recognized net actuarial loss	105	77	313	232
Net periodic benefit cost	151	132	452	395
Postretirement Medical Plans
Defined Benefit Plan Disclosure [Line Items]
Service cost	4	5	13	16
Interest cost	17	19	50	56
Expected return on plan assets	(8)	(5)	(23)	(17)
Amortization of prior-year service costs	(1)	0	(2)	(1)
Recognized net actuarial loss	10	7	30	23
Net periodic benefit cost	$ 22	$ 26	$ 68	$ 77