Pension and Other Benefit Programs - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Oct. 01, 2022	Oct. 02, 2021	Oct. 03, 2020
Defined Benefit Plan Disclosure [Line Items]
New vesting service year requirement effective January 1, 2012	3 years
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Increase (Decrease) for Plan Amendment	$ 428
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)	(81)
Pension plans with accumulated benefit obligations in excess of plan assets, projected benefit obligation	1,200	$ 9,000
Pension plans with accumulated benefit obligations in excess of plan assets, accumulated benefit obligation	1,100	8,500
Pension plans with accumulated benefit obligations in excess of plan assets, aggregate fair value of plan assets		6,900
Total accumulated pension benefit obligations	$ 14,100	$ 19,400
Total accumulated pension benefit obligations, vested percentage	98.00%	98.00%
Additional Capital Contributions Commitment	$ 1,500
Pension and postretirement medical plans, employer contributions	$ 157
Defined contribution plan, contribution rate	50.00%
Savings and investment plans, employees contribution rate	50.00%
Defined contribution plans, employer contributions	$ 325	$ 254	$ 242
Minimum
Defined Benefit Plan Disclosure [Line Items]
Defined contribution plan, contribution rate	4.00%
Maximum
Defined Benefit Plan Disclosure [Line Items]
Defined contribution plan, contribution rate	10.00%
Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)	$ 318	579	410
Defined Benefit Plan, Pension Plan with Projected Benefit Obligation in Excess of Plan Assets, Projected Benefit Obligation	1,200	19,900
Defined Benefit Plan, Pension Plan with Projected Benefit Obligation in Excess of Plan Assets, Plan Assets		16,900
Pension and postretirement medical plans, employer contributions	96	565
Postretirement Medical Plans
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)	29	32	$ 23
Defined Benefit Plan, Pension Plan with Projected Benefit Obligation in Excess of Plan Assets, Projected Benefit Obligation	1,500	2,100
Defined Benefit Plan, Pension Plan with Projected Benefit Obligation in Excess of Plan Assets, Plan Assets	700	900
Pension and postretirement medical plans, employer contributions	$ 61	$ 47
Defined Benefit Plan, Health Care Cost Trend Rate Assumed, Next Fiscal Year	7.00%	7.00%	7.00%
Rate of increase to which the cost of benefits is assumed to decline (the ultimate trend rate)	4.00%	4.00%	4.25%