Comprehensive Income - Pre-tax Amounts Reclassified from AOCI into Condensed Consolidated Statements of Operations (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jul. 01, 2017	Jun. 25, 2016	Jul. 01, 2017	Jun. 25, 2016
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Revenue	$ (45,408)	$ (42,358)	$ (176,655)	$ (168,787)
Cost of sales	27,920	26,252	108,400	102,337
Other income/(expense), net	(540)	(364)	(1,948)	(921)
Total amounts reclassified from AOCI	(11,308)	(10,469)	(50,172)	(49,184)
Reclassifications out of AOCI
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total amounts reclassified from AOCI	(633)	(154)	(1,448)	(1,188)
Reclassifications out of AOCI | Unrealized (gains)/losses on derivative instruments
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total amounts reclassified from AOCI	(585)	(134)	(1,411)	(1,317)
Reclassifications out of AOCI | Unrealized (gains)/losses on derivative instruments | Foreign exchange contracts
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Revenue	(148)	(131)	(657)	(785)
Cost of sales	(73)	106	(630)	(419)
Other income/(expense), net	(364)	(112)	(127)	(123)
Reclassifications out of AOCI | Unrealized (gains)/losses on derivative instruments | Interest rate contracts
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other income/(expense), net	0	3	3	10
Reclassifications out of AOCI | Unrealized (gains)/losses on marketable securities
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other income/(expense), net	$ (48)	$ (20)	$ (37)	$ 129