Income Taxes - Additional Information (Details) $ in Millions, € in Billions		12 Months Ended
	Aug. 30, 2016 EUR (€) Subsidiary	Sep. 30, 2017 USD ($)	Sep. 24, 2016 USD ($)	Sep. 26, 2015 USD ($)	Sep. 27, 2014 USD ($)
Income Tax Disclosure [Abstract]
Foreign pre-tax earnings		$ 44,700	$ 41,100	$ 47,600
Statutory tax rate in foreign operations		12.50%
Undistributed earnings of foreign subsidiaries		$ 128,700
Deferred tax liability related to foreign earnings that may be repatriated		42,200
Cash, cash equivalents and marketable securities held by foreign subsidiaries		$ 252,300	$ 216,000
Reconciliation of provision for income taxes, statutory federal income tax rate		35.00%	35.00%	35.00%
Net excess tax benefits from equity awards		$ 620	$ 379	$ 748
Measurement of tax position, minimum likelihood of tax benefits being realized upon ultimate settlement, percentage		50.00%
Gross unrecognized tax benefits		$ 8,407	7,724	6,900	$ 4,033
Gross unrecognized tax benefits that would affect effective tax rate, if recognized		2,500	2,800
Unrecognized tax benefits, gross interest and penalties accrued		1,200	1,000
Tax matters, recognized interest and penalty expense		$ 165	$ 295	$ 709
Unfavorable investigation outcome, EU State Aid rules
Loss Contingencies [Line Items]
Number of subsidiaries impacted by the European Commission tax ruling | Subsidiary	2
Maximum potential loss related to European Commission tax ruling | €	€ 13
Unfavorable investigation outcome, EU State Aid rules - interest component
Loss Contingencies [Line Items]
Maximum potential loss related to European Commission tax ruling | €	€ 1