Pension and Other Benefit Programs - Additional Information (Detail) (USD $)	12 Months Ended
	Sep. 29, 2012	Oct. 01, 2011	Oct. 02, 2010
Defined Benefit Plan Disclosure [Line Items]
Original vesting service year requirement before December 31, 2011	5 years
New vesting service year requirement effective January 1, 2012	3 years
Pension plans with accumulated benefit obligations in excess of plan assets, projected benefit obligation	$ 10,600,000,000	$ 8,700,000,000
Pension plans with accumulated benefit obligations in excess of plan assets, accumulated benefit obligation	9,800,000,000	8,100,000,000
Pension plans with accumulated benefit obligations in excess of plan assets, aggregate fair value of plan assets	7,100,000,000	5,700,000,000
Pension plans with projected benefit obligations in excess of plan assets, projected benefit obligation	10,600,000,000	8,700,000,000
Pension plans with projected benefit obligations in excess of plan assets, aggregate fair value of plan assets	7,100,000,000	5,700,000,000
Total accumulated pension benefit obligations	10,700,000,000	8,800,000,000
Total accumulated pension benefit obligations, vested percentage	97.00%	97.00%
Postretirement medical plans with accumulated postretirement medical benefit obligations in excess of plan assets, accumulated benefit obligations	1,700,000,000	1,600,000,000
Postretirement medical plans with accumulated postretirement medical benefit obligations in excess of plan assets, fair value of plan assets	400,000,000	300,000,000
Total committed capital under alternative investments	512,000,000
Pension and postretirement medical plans, employer contributions	905,000,000
Actuarial valuation, assumed annual rate of increase in per capita cost of covered healthcare claims	7.50%
Rate of increase to which the cost of benefits is assumed to decline (the ultimate trend rate)	4.50%
Savings and investment plans, employees contribution rate	50.00%
Defined contribution plan, contribution rate	50.00%
Defined contribution plans, employer contributions	63,000,000	59,000,000	54,000,000
Minimum
Defined Benefit Plan Disclosure [Line Items]
Expected pension and postretirement medical plan contributions in fiscal 2013	425,000,000
Defined contribution plan, contribution rate	3.00%
Maximum
Defined Benefit Plan Disclosure [Line Items]
Expected pension and postretirement medical plan contributions in fiscal 2013	$ 475,000,000
Defined contribution plan, contribution rate	9.00%