Provision for Income Taxes (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
Sep. 27, 2014	Sep. 28, 2013	Sep. 29, 2012
Federal:
Current	$ 8,624us-gaap_CurrentFederalTaxExpenseBenefit	$ 9,334us-gaap_CurrentFederalTaxExpenseBenefit	$ 7,240us-gaap_CurrentFederalTaxExpenseBenefit
Deferred	3,183	1,878	5,018
Federal Income Tax Expense (Benefit), Continuing Operations, Total	11,807	11,212	12,258
State:
Current	855	1,084	1,182
Deferred	(178)	(311)	(123)
State and Local Income Tax Expense (Benefit), Continuing Operations, Total	677	773	1,059
Foreign:
Current	2,147us-gaap_CurrentForeignTaxExpenseBenefit	1,559us-gaap_CurrentForeignTaxExpenseBenefit	1,203us-gaap_CurrentForeignTaxExpenseBenefit
Deferred	(658)	(426)	(490)
Foreign Income Tax Expense (Benefit), Continuing Operations, Total	1,489	1,133	713
Provision for income taxes	$ 13,973us-gaap_IncomeTaxExpenseBenefit	$ 13,118us-gaap_IncomeTaxExpenseBenefit	$ 14,030us-gaap_IncomeTaxExpenseBenefit

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