Debt - Additional Information (Details) - USD ($) $ in Millions	Mar. 30, 2024	Sep. 30, 2023
Debt Instrument [Line Items]
Commercial paper	$ 1,997	$ 5,985
Fixed-rate notes, aggregate carrying amount	102,600	105,100
Commercial paper
Debt Instrument [Line Items]
Commercial paper	2,000	6,000
Level 2
Debt Instrument [Line Items]
Fixed-rate notes, aggregate fair value	$ 91,600	$ 90,800