Income Taxes - Additional Information (Details) $ in Millions, € in Billions				12 Months Ended
	Jan. 01, 2018	Dec. 31, 2017	Aug. 30, 2016 EUR (€) Subsidiary	Sep. 29, 2018 USD ($)	Sep. 30, 2017 USD ($)	Sep. 24, 2016 USD ($)	Sep. 26, 2015 USD ($)
Income Tax Contingency [Line Items]
U.S. statutory federal income tax rate	21.00%	35.00%		24.50%	35.00%	35.00%
Provision for income taxes related to the Act				$ 1,500
Provision for income taxes related to remeasurement of deferred tax balances				2,000
Provision for income taxes related to deemed repatriation tax, provisional amount				1,200
Increase/(Reduction) to unrecognized tax benefits related to deemed repatriation tax				(1,700)
Provision for income taxes related to remeasurement of deferred tax balances, provisional amount				1,200
Deferred tax liability for unremitted foreign earnings				275	$ 36,355
Deferred tax liability reversal				32,590	(5,966)	$ (4,938)
Deemed repatriation tax payable, provisional amount				37,300
Reclassification from AOCI to retained earnings, tax effects of the Act				0
Foreign pre-tax earnings				48,000	44,700	41,100
Net excess tax benefits from equity awards					620	379
Gross unrecognized tax benefits				9,694	8,407	7,724	$ 6,900
Gross unrecognized tax benefits that would impact effective tax rate, if recognized				7,400	2,500
Unrecognized tax benefits, gross interest and penalties accrued				1,400	1,200
Tax matters, recognized interest and penalty expense				236	165	295
Reasonably possible decrease in gross unrecognized tax benefits over next 12 months				800
Unfavorable investigation outcome, EU State Aid rules
Income Tax Contingency [Line Items]
Number of subsidiaries impacted by the European Commission tax ruling | Subsidiary			2
Maximum potential loss related to European Commission tax ruling | €			€ 13.1
Unfavorable investigation outcome, EU State Aid rules - interest component
Income Tax Contingency [Line Items]
Maximum potential loss related to European Commission tax ruling | €			€ 1.2
Tax Cuts and Jobs Act, deemed repatriation tax, related amount
Income Tax Contingency [Line Items]
Deferred tax liability reversal				(36,100)
Accumulated Other Comprehensive Income/(Loss)
Income Tax Contingency [Line Items]
Reclassification from AOCI to retained earnings, tax effects of the Act				(278)
Net excess tax benefits from equity awards					0	0
Retained Earnings
Income Tax Contingency [Line Items]
Reclassification from AOCI to retained earnings, tax effects of the Act				278
Net excess tax benefits from equity awards					$ 0	$ 0
Accounting Standards Update 2018-02 | Accumulated Other Comprehensive Income/(Loss)
Income Tax Contingency [Line Items]
Reclassification from AOCI to retained earnings, tax effects of the Act				(278)
Accounting Standards Update 2018-02 | Retained Earnings
Income Tax Contingency [Line Items]
Reclassification from AOCI to retained earnings, tax effects of the Act				$ 278