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Reconciliation of Segment Operating Income to Consolidated Statements of Operations (Detail) - USD ($)
$ in Millions
12 Months Ended
Sep. 26, 2015
Sep. 27, 2014
Sep. 28, 2013
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]      
Operating income $ 71,230 $ 52,503 $ 48,999
Research and development expense (8,067) (6,041) (4,475)
Operating Segments      
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]      
Operating income 83,850 62,209 56,525
Segment Reconciling Items      
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]      
Research and development expense (8,067) (6,041) (4,475)
Corporate Non-Segment      
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]      
Other corporate expenses, net $ (4,553) $ (3,665) $ (3,051)