Pension and Other Benefit Programs - Defined Benefit Plan Assets Measured at Fair Value (Detail) - USD ($) $ in Millions		Sep. 28, 2024	Sep. 30, 2023
Schedule of Pension and Other Postretirement Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets in the Fair Value Hierarchy		$ 18,449	$ 16,223
Percentage of plan assets mix		100.00%	100.00%
Cash
Schedule of Pension and Other Postretirement Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items]
Percentage of plan assets mix		0.00%	0.00%
Equity Securities
Schedule of Pension and Other Postretirement Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items]
Percentage of plan assets mix		18.00%	22.00%
Mutual Funds
Schedule of Pension and Other Postretirement Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items]
Percentage of plan assets mix		4.00%	7.00%
US Government Debt Securities
Schedule of Pension and Other Postretirement Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items]
Percentage of plan assets mix		25.00%	15.00%
Corporate Bond Securities
Schedule of Pension and Other Postretirement Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items]
Percentage of plan assets mix		11.00%	4.00%
Other Mortgage and Asset Backed Securities
Schedule of Pension and Other Postretirement Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items]
Percentage of plan assets mix		1.00%	1.00%
Derivatives and Other, Net
Schedule of Pension and Other Postretirement Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items]
Percentage of plan assets mix		0.00%	0.00%
Common Collective Funds
Schedule of Pension and Other Postretirement Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets in the Fair Value Hierarchy		$ 2,380	$ 3,517
Percentage of plan assets mix		13.00%	22.00%
Alternative Investments Funds
Schedule of Pension and Other Postretirement Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets in the Fair Value Hierarchy		$ 4,350	$ 4,352
Percentage of plan assets mix		24.00%	27.00%
Money Market Funds and Other
Schedule of Pension and Other Postretirement Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets in the Fair Value Hierarchy		$ 745	$ 281
Percentage of plan assets mix		4.00%	2.00%
Level 1 | Cash
Schedule of Pension and Other Postretirement Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets in the Fair Value Hierarchy		$ 19	$ 68
Level 1 | Equity Securities
Schedule of Pension and Other Postretirement Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets in the Fair Value Hierarchy	[1]	3,377	3,517
Level 1 | Mutual Funds
Schedule of Pension and Other Postretirement Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets in the Fair Value Hierarchy		701	1,139
Level 1 | US Government Debt Securities
Schedule of Pension and Other Postretirement Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets in the Fair Value Hierarchy		2,744	2,025
Level 1 | Corporate Bond Securities
Schedule of Pension and Other Postretirement Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets in the Fair Value Hierarchy		0	0
Level 1 | Other Mortgage and Asset Backed Securities
Schedule of Pension and Other Postretirement Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets in the Fair Value Hierarchy		0	0
Level 1 | Derivatives and Other, Net
Schedule of Pension and Other Postretirement Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets in the Fair Value Hierarchy		10	0
Level 1 | Total Investments at Fair Value
Schedule of Pension and Other Postretirement Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets in the Fair Value Hierarchy		6,851	6,749
Level 2 | Cash
Schedule of Pension and Other Postretirement Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets in the Fair Value Hierarchy		0	0
Level 2 | Equity Securities
Schedule of Pension and Other Postretirement Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets in the Fair Value Hierarchy	[1]	0	0
Level 2 | Mutual Funds
Schedule of Pension and Other Postretirement Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets in the Fair Value Hierarchy		0	0
Level 2 | US Government Debt Securities
Schedule of Pension and Other Postretirement Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets in the Fair Value Hierarchy		1,845	442
Level 2 | Corporate Bond Securities
Schedule of Pension and Other Postretirement Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets in the Fair Value Hierarchy		2,111	750
Level 2 | Other Mortgage and Asset Backed Securities
Schedule of Pension and Other Postretirement Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets in the Fair Value Hierarchy		166	120
Level 2 | Derivatives and Other, Net
Schedule of Pension and Other Postretirement Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets in the Fair Value Hierarchy		1	12
Level 2 | Total Investments at Fair Value
Schedule of Pension and Other Postretirement Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets in the Fair Value Hierarchy		4,123	1,324
Level 1 and 2 | Cash
Schedule of Pension and Other Postretirement Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets in the Fair Value Hierarchy		19	68
Level 1 and 2 | Equity Securities
Schedule of Pension and Other Postretirement Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets in the Fair Value Hierarchy	[1]	3,377	3,517
Level 1 and 2 | Mutual Funds
Schedule of Pension and Other Postretirement Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets in the Fair Value Hierarchy		701	1,139
Level 1 and 2 | US Government Debt Securities
Schedule of Pension and Other Postretirement Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets in the Fair Value Hierarchy		4,589	2,467
Level 1 and 2 | Corporate Bond Securities
Schedule of Pension and Other Postretirement Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets in the Fair Value Hierarchy		2,111	750
Level 1 and 2 | Other Mortgage and Asset Backed Securities
Schedule of Pension and Other Postretirement Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets in the Fair Value Hierarchy		166	120
Level 1 and 2 | Derivatives and Other, Net
Schedule of Pension and Other Postretirement Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets in the Fair Value Hierarchy		11	12
Level 1 and 2 | Total Investments at Fair Value
Schedule of Pension and Other Postretirement Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets in the Fair Value Hierarchy		$ 10,974	$ 8,073

[1] Includes 2.9 million shares of Company common stock valued at $278 million and 2.9 million shares valued at $235 million at September 28, 2024 and September 30, 2023, respectively.