Pension and Other Benefit Programs - Net Periodic Benefit Cost (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Sep. 28, 2013	Sep. 29, 2012	Oct. 01, 2011
Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Service costs	$ 349	$ 278	$ 293
Interest costs	433	440	411
Expected return on plan assets	(604)	(514)	(440)
Amortization of prior year service costs	10	12	14
Recognized net actuarial loss	418	309	230
Net periodic benefit cost	606	525	508
Postretirement Medical Plans
Defined Benefit Plan Disclosure [Line Items]
Service costs	18	21	18
Interest costs	66	74	66
Expected return on plan assets	(30)	(23)	(24)
Amortization of prior year service costs	(2)	(2)	(1)
Recognized net actuarial loss	40	31	9
Net periodic benefit cost	$ 92	$ 101	$ 68