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Commitments and Contingencies - Changes in Accrued Warranties and Related Costs (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Mar. 27, 2021
Mar. 28, 2020
Mar. 27, 2021
Mar. 28, 2020
Changes in Accrued Warranties and Related Costs [Roll Forward]        
Beginning accrued warranty and related costs $ 4,124 $ 3,873 $ 3,354 $ 3,570
Cost of warranty claims (649) (689) (1,372) (1,604)
Accruals for product warranty 309 739 1,802 1,957
Ending accrued warranty and related costs $ 3,784 $ 3,923 $ 3,784 $ 3,923