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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. 28, 2020
Mar. 30, 2019
Mar. 28, 2020
Mar. 30, 2019
Changes in Accrued Warranties and Related Costs [Roll Forward]        
Beginning accrued warranty and related costs $ 3,873 $ 3,819 $ 3,570 $ 3,692
Cost of warranty claims (689) (915) (1,604) (1,911)
Accruals for product warranty 739 583 1,957 1,706
Ending accrued warranty and related costs $ 3,923 $ 3,487 $ 3,923 $ 3,487