Pension and Other Benefit Programs - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Sep. 27, 2025	Sep. 28, 2024	Sep. 30, 2023
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	$ 1,300	$ 1,400
Pension plans with accumulated benefit obligations in excess of plan assets, accumulated benefit obligation		1,300
Total accumulated pension benefit obligations	$ 15,500	$ 15,700
Total accumulated pension benefit obligations, vested percentage	99.00%	98.00%
Additional Capital Contributions Commitment	$ 1,300
Pension and postretirement medical plans, employer contributions	$ 98
Defined Contribution Plan, Employer Matching Contribution, Percent of Match	50.00%
Defined contribution plans, employer contributions	$ 448	$ 408	$ 378
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)	$ 136	(27)	(56)
Defined Benefit Plan, Pension Plan with Projected Benefit Obligation in Excess of Plan Assets, Projected Benefit Obligation	1,400
Pension and postretirement medical plans, employer contributions	71	69
Postretirement Medical Plans
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)	(132)	(128)	$ 3
Defined Benefit Plan, Pension Plan with Projected Benefit Obligation in Excess of Plan Assets, Projected Benefit Obligation	900	1,000
Defined Benefit Plan, Pension Plan with Projected Benefit Obligation in Excess of Plan Assets, Plan Assets		900
Pension and postretirement medical plans, employer contributions	$ 27	$ 26
Defined Benefit Plan, Health Care Cost Trend Rate Assumed, Next Fiscal Year	7.50%	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%