Pension and Other Benefit Programs - Additional Information (Detail) (USD $)	12 Months Ended
	Oct. 01, 2011	Oct. 02, 2010	Oct. 03, 2009
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
Expected reduction in plan compensation expense in fiscal 2012	$ 75,000,000
Pension and postretirement medical plans, Employer contributions	935,000,000
Multi-employer Plans, Employer contributions	59,000,000	60,000,000	52,000,000
Savings and investment plans, Employees contribution rate	50.00%
Savings and investment plans, Contribution rate to match employee's pre-tax contribution up to plan limits	50.00%
Defined Contribution Plans, Employer contributions	59,000,000	54,000,000	51,000,000
Pension plans with accumulated benefit obligations in excess of plan assets, projected benefit obligation	8,700,000,000	7,300,000,000
Pension plans with accumulated benefit obligations in excess of plan assets, accumulated benefit obligation	8,100,000,000	6,800,000,000
Pension plans with accumulated benefit obligations in excess of plan assets, aggregate fair value of plan assets	5,700,000,000	4,900,000,000
Pension plans with projected benefit obligations in excess of plan assets, projected benefit obligation	8,700,000,000	7,300,000,000
Pension plans with projected benefit obligations in excess of plan assets, aggregate fair value of plan assets	5,700,000,000	4,900,000,000
Total accumulated pension benefit obligations	8,800,000,000	7,500,000,000
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	1,600,000,000	1,300,000,000
Postretirement medical plans with accumulated postretirement medical benefit obligations in excess of plan assets, fair value of plan assets	300,000,000	300,000,000
Total committed capital under alternative investments	462,000,000
Postretirement Medical Plans
Defined Benefit Plan Disclosure [Line Items]
Pension and postretirement medical plans, Employer contributions	9,000,000	12,000,000
Year 1 increase in cost of benefits	8.00%	8.25%	8.50%
Rate of increase to which the cost of benefits is assumed to decline (the ultimate trend rate)	4.50%	4.75%	5.00%
Minimum
Defined Benefit Plan Disclosure [Line Items]
Expected pension and postretirement medical plan contributions in fiscal 2012	325,000,000
Maximum
Defined Benefit Plan Disclosure [Line Items]
Expected pension and postretirement medical plan contributions in fiscal 2012	$ 375,000,000