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Benefit Plans - Summary of Share-Based Compensation Expense and the Related Income Tax Benefit (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Mar. 27, 2021
Mar. 28, 2020
Mar. 27, 2021
Mar. 28, 2020
Share-based Payment Arrangement [Abstract]        
Share-based compensation expense $ 1,981 $ 1,697 $ 4,001 $ 3,407
Income tax benefit related to share-based compensation expense $ (575) $ (444) $ (2,199) $ (1,202)