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Segment Information and Geographic Data - Information by Reportable Segment (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Mar. 27, 2021
Mar. 28, 2020
Mar. 27, 2021
Mar. 28, 2020
Segment Reporting Information [Line Items]        
Net sales $ 89,584 $ 58,313 $ 201,023 $ 150,132
Operating income 27,503 12,853 61,037 38,422
Americas        
Segment Reporting Information [Line Items]        
Net sales 34,306 25,473 80,616 66,840
Operating income 12,050 7,261 27,835 20,353
Europe        
Segment Reporting Information [Line Items]        
Net sales 22,264 14,294 49,570 37,567
Operating income 8,265 4,528 17,854 12,247
Greater China        
Segment Reporting Information [Line Items]        
Net sales 17,728 9,455 39,041 23,033
Operating income 7,758 3,758 16,288 9,121
Japan        
Segment Reporting Information [Line Items]        
Net sales 7,742 5,206 16,027 11,429
Operating income 3,428 2,236 6,931 5,014
Rest of Asia Pacific        
Segment Reporting Information [Line Items]        
Net sales 7,544 3,885 15,769 11,263
Operating income $ 2,736 $ 1,290 $ 5,689 $ 4,021