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Pre-tax Amounts Reclassified from AOCI into Consolidated Statements of Operations (Detail) - USD ($)
$ in Millions
12 Months Ended
Sep. 26, 2015
Sep. 27, 2014
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Unrealized (gains)/losses on derivative instruments reclassified from AOCI $ (4,127) $ 185
Unrealized (gains)/losses on marketable securities reclassified from AOCI 91 (205)
Total amounts reclassified from AOCI (4,036) (20)
Foreign exchange contracts | Revenue    
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Unrealized (gains)/losses on derivative instruments reclassified from AOCI (2,432) 449
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 (2,168) (295)
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 456 15
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 $ 17 $ 16