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Debt - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jun. 27, 2020	Jun. 29, 2019	Jun. 27, 2020	Jun. 29, 2019	Sep. 28, 2019
Debt Instrument [Line Items]
Marketable securities pledged as collateral under repos	$ 5,300		$ 5,300
Floating- and fixed-rate notes, aggregate principal amount	100,065		100,065		$ 101,679
Interest cost on term debt	664	$ 790	2,100	$ 2,400
Level 2
Debt Instrument [Line Items]
Floating- and fixed-rate notes, aggregate fair value	110,800		110,800		107,500
Net investment hedges
Debt Instrument [Line Items]
Carrying value of debt designated as a net investment hedge					1,000
Commercial paper
Debt Instrument [Line Items]
Commercial paper	$ 6,000		$ 6,000		$ 6,000
Short-term borrowings, general maturity period (less than)			9 months
Commercial paper, weighted-average interest rate	0.77%		0.77%		2.24%
Repos
Debt Instrument [Line Items]
Short-term borrowings, general maturity period (less than)			3 months
Repo liabilities	$ 5,200		$ 5,200