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Debt - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 27, 2021	Mar. 28, 2020	Mar. 27, 2021	Mar. 28, 2020	Sep. 26, 2020
Debt Instrument [Line Items]
Commercial paper	$ 5,000		$ 5,000		$ 4,996
Floating- and fixed-rate notes, aggregate principal amount	116,005		116,005		106,078
Interest cost on term debt	657	$ 725	1,300	$ 1,500
Commercial paper
Debt Instrument [Line Items]
Commercial paper	$ 5,000		$ 5,000		$ 5,000
Commercial paper, general maturity period (less than)			9 months
Commercial paper, weighted-average interest rate	0.06%		0.06%		0.62%
Level 2
Debt Instrument [Line Items]
Floating- and fixed-rate notes, aggregate fair value	$ 121,200		$ 121,200		$ 117,100