Pre-tax Amounts Reclassified from AOCI into Condensed Consolidated Statements of Operations (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Mar. 28, 2015	Mar. 29, 2014	Mar. 28, 2015	Mar. 29, 2014
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Unrealized (gains)/losses on derivative instruments reclassified from AOCI	$ (814)	$ (14)	$ (1,477)	$ 74
Unrealized (gains)/losses on marketable securities reclassified from AOCI	56	(60)	34	(77)
Total amounts reclassified from AOCI	(758)	(74)	(1,443)	(3)
Foreign exchange contracts | Revenue
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Unrealized (gains)/losses on derivative instruments reclassified from AOCI	(558)	119	(1,007)	303
Foreign exchange contracts | Cost of sales
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Unrealized (gains)/losses on derivative instruments reclassified from AOCI	(608)	(141)	(921)	(251)
Foreign exchange contracts | Other income/expense, net
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Unrealized (gains)/losses on derivative instruments reclassified from AOCI	(1)	4	(1)	14
Interest rate contracts | Other income/expense, net
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Unrealized (gains)/losses on derivative instruments reclassified from AOCI	$ 353	$ 4	$ 452	$ 8