Pension and Other Benefit Programs - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Sep. 28, 2024	Sep. 30, 2023	Oct. 01, 2022
Defined Benefit Plan Disclosure [Line Items]
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	$ 1,400	$ 1,200
Pension plans with accumulated benefit obligations in excess of plan assets, accumulated benefit obligation	1,300	1,100
Total accumulated pension benefit obligations	$ 15,700	$ 13,800
Total accumulated pension benefit obligations, vested percentage	98.00%	98.00%
Additional Capital Contributions Commitment	$ 1,500
Pension and postretirement medical plans, employer contributions	$ 95
Defined Contribution Plan, Employer Matching Contribution, Percent of Match	50.00%
Defined contribution plans, employer contributions	$ 408	$ 378	$ 325
Minimum
Defined Benefit Plan Disclosure [Line Items]
Defined contribution plan, contribution rate	3.00%
Maximum
Defined Benefit Plan Disclosure [Line Items]
Defined contribution plan, contribution rate	9.00%
Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)	$ (27)	(56)	318
Defined Benefit Plan, Pension Plan with Projected Benefit Obligation in Excess of Plan Assets, Projected Benefit Obligation	1,400	1,200
Pension and postretirement medical plans, employer contributions	69	73
Postretirement Medical Plans
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)	(128)	3	$ 29
Defined Benefit Plan, Pension Plan with Projected Benefit Obligation in Excess of Plan Assets, Projected Benefit Obligation	1,000	1,000
Defined Benefit Plan, Pension Plan with Projected Benefit Obligation in Excess of Plan Assets, Plan Assets	900	800
Pension and postretirement medical plans, employer contributions	$ 26	$ 29
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%	4.00%