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Debt - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 30, 2019	Mar. 31, 2018	Mar. 30, 2019	Mar. 31, 2018	Sep. 29, 2018
Debt Instrument [Line Items]
Commercial paper	$ 11,924		$ 11,924		$ 11,964
Commercial paper, general maturity period (less than)			9 months
Commercial paper, weighted-average interest rate	2.56%		2.56%		2.18%
Floating- and fixed-rate notes, aggregate principal amount	$ 101,242		$ 101,242		$ 104,193
Interest expense on term debt	828	$ 742	1,600	$ 1,400
Level 2
Debt Instrument [Line Items]
Floating- and fixed-rate notes, aggregate fair value	103,300		103,300		103,200
Net investment hedges
Debt Instrument [Line Items]
Carrying value of debt designated as a net investment hedge	$ 1,100		$ 1,100		$ 811