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Revenue Recognition - Net Sales Disaggregated by Significant Products and Services (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Mar. 27, 2021
Mar. 28, 2020
Mar. 27, 2021
Mar. 28, 2020
Disaggregation of Revenue [Line Items]        
Net sales $ 89,584 $ 58,313 $ 201,023 $ 150,132
Revenue recognized that was included in deferred revenue at the beginning of the period 2,700 1,900 4,100 3,000
iPhone        
Disaggregation of Revenue [Line Items]        
Net sales 47,938 28,962 113,535 84,919
Mac        
Disaggregation of Revenue [Line Items]        
Net sales 9,102 5,351 17,777 12,511
iPad        
Disaggregation of Revenue [Line Items]        
Net sales 7,807 4,368 16,242 10,345
Wearables, Home and Accessories        
Disaggregation of Revenue [Line Items]        
Net sales 7,836 6,284 20,807 16,294
Services        
Disaggregation of Revenue [Line Items]        
Net sales $ 16,901 $ 13,348 $ 32,662 $ 26,063