Debt - Borrowings and Repayments (Detail) - USD ($) $ in Millions			9 Months Ended
	Jun. 25, 2025	Nov. 08, 2024	Sep. 30, 2025	Sep. 30, 2024
Debt
Debt repayments			$ 15,772	$ 10,619
Net proceeds			14,956	$ 10,914
Commercial Paper Program [Member]
Debt
Commercial paper repayments			15,100
Commercial paper borrowings			$ 14,700
3.125% senior notes due March 2025 [Member]
Debt
Interest rate (as a percent)			3.125%
Debt repayments			$ 422
3.875% Senior Notes due 2029 [Member]
Debt
Interest rate (as a percent)	3.875%
Debt amount tendered	$ 483	$ 485
Debt amount tendered (as a percent)	99.00%
Tax Exempt Bonds [Member]
Debt
Debt repayments			110
Net proceeds			252
Financing leases and other [Member]
Debt
Non-cash financing lease incurred			208
Debt repayments			$ 107