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Debt - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 28, 2020	Mar. 30, 2019	Mar. 28, 2020	Mar. 30, 2019	Sep. 28, 2019
Debt Instrument [Line Items]
Marketable securities pledged as collateral under repos	$ 2,600		$ 2,600
Floating- and fixed-rate notes, aggregate principal amount	97,968		97,968		$ 101,679
Interest cost on term debt	725	$ 828	1,500	$ 1,600
Level 2
Debt Instrument [Line Items]
Floating- and fixed-rate notes, aggregate fair value	105,600		105,600		107,500
Net investment hedges
Debt Instrument [Line Items]
Carrying value of debt designated as a net investment hedge	663		663		1,000
Commercial paper
Debt Instrument [Line Items]
Commercial paper	$ 7,500		$ 7,500		$ 6,000
Short-term borrowings, general maturity period (less than)			9 months
Commercial paper, weighted-average interest rate	1.39%		1.39%		2.24%
Repos
Debt Instrument [Line Items]
Short-term borrowings, general maturity period (less than)			6 months
Repo liabilities	$ 2,600		$ 2,600