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Segment Information and Geographic Data - Reconciliation of Segment Operating Income to the Condensed Consolidated Statements of Operations (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Mar. 27, 2021
Mar. 28, 2020
Mar. 27, 2021
Mar. 28, 2020
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]        
Operating income $ 27,503 $ 12,853 $ 61,037 $ 38,422
Research and development expense (5,262) (4,565) (10,425) (9,016)
Operating segments        
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]        
Operating income 34,237 19,073 74,597 50,756
Segment reconciling items        
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]        
Research and development expense (5,262) (4,565) (10,425) (9,016)
Corporate non-segment        
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]        
Other corporate expenses, net $ (1,472) $ (1,655) $ (3,135) $ (3,318)