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Debt - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jun. 29, 2019	Jun. 30, 2018	Jun. 29, 2019	Jun. 30, 2018	Sep. 29, 2018
Debt Instrument [Line Items]
Commercial paper	$ 9,953		$ 9,953		$ 11,964
Commercial paper, general maturity period (less than)			9 months
Commercial paper, weighted-average interest rate	2.49%		2.49%		2.18%
Floating- and fixed-rate notes, aggregate principal amount	$ 98,322		$ 98,322		$ 104,193
Interest cost on term debt	790	$ 780	2,400	$ 2,200
Level 2
Debt Instrument [Line Items]
Floating- and fixed-rate notes, aggregate fair value	102,500		102,500		103,200
Net investment hedges
Debt Instrument [Line Items]
Carrying value of debt designated as a net investment hedge	$ 1,200		$ 1,200		$ 811