Income Taxes - Additional Information (Details) $ in Millions, € in Billions				3 Months Ended
	Jan. 01, 2018	Dec. 31, 2017	Aug. 30, 2016 EUR (€) Subsidiary	Dec. 30, 2017 USD ($)	Dec. 31, 2016 USD ($)	Sep. 30, 2017 USD ($)
Income Tax Contingency [Line Items]
U.S. statutory federal income tax rate	21.00%	35.00%
Provision for income taxes				$ 6,965	$ 6,289
Provision for income taxes related to the Act, provisional amount				2,600
Provision for income taxes related to remeasurement of deferred tax balances, provisional amount				1,800
Provision for income taxes related to deemed repatriation tax, provisional amount				800
Deferred tax liability for unremitted foreign earnings						$ 36,400
Deferred tax liability reversal				33,737	$ (1,452)
Deemed repatriation tax payable, provisional amount				38,000
Gross unrecognized tax benefits				9,000
Unrecognized tax benefits that would affect effective tax rate, if recognized				7,700
Unrecognized tax benefits, gross interest and penalties accrued				1,400
Reasonably possible decrease in gross unrecognized tax benefits over next 12 months				2,900
Unfavorable investigation outcome, EU State Aid rules
Income Tax Contingency [Line Items]
Number of subsidiaries impacted by 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
Income Tax Contingency [Line Items]
Maximum potential loss related to European Commission tax ruling | €			€ 1
Tax Cuts and Jobs Act, deemed repatriation tax, related amount
Income Tax Contingency [Line Items]
Deferred tax liability reversal				36,100
Reduction of unrecognized tax benefits				$ 1,100