Pension and Other Benefit Programs - Accumulated Other Comprehensive Loss, Before Tax, not yet Recognized in Net Periodic Benefit Cost (Detail) (USD $) In Millions, unless otherwise specified	Sep. 28, 2013	Sep. 29, 2012
Defined Benefit Plan Disclosure [Line Items]
Unrecognized prior service (cost) / credit	$ (70)
Unrecognized net actuarial (loss) / gain	(1,913)
Total amounts included in AOCI	(1,983)
Prepaid / (accrued) pension cost	65
Net balance sheet liability	(1,918)
Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Unrecognized prior service (cost) / credit	(74)
Unrecognized net actuarial (loss) / gain	(1,984)
Total amounts included in AOCI	(2,058)
Prepaid / (accrued) pension cost	957
Net balance sheet liability	(1,101)	(3,481)
Postretirement Medical Plans
Defined Benefit Plan Disclosure [Line Items]
Unrecognized prior service (cost) / credit	4
Unrecognized net actuarial (loss) / gain	71
Total amounts included in AOCI	75
Prepaid / (accrued) pension cost	(892)
Net balance sheet liability	$ (817)	$ (1,360)