Employee Benefit Plans - Summary of Restricted Stock and Stock Unit Awards (Details) - Restricted Stock/Stock Units - USD ($) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
	Jul. 30, 2022	Jul. 31, 2021	Jul. 25, 2020
Restricted Stock/ Stock Units
Unvested, Beginning balance (in shares)	94	96	100
Granted and assumed (in shares)	52	51	49
Vested (in shares)	(37)	(39)	(44)
Canceled/forfeited/other (in shares)	(12)	(14)	(9)
Unvested, Ending balance (in shares)	97	94	96
Weighted-Average Grant Date Fair Value per Share
Unvested, Beginning balance (in dollars per share)	$ 42.93	$ 42.03	$ 38.66
Granted and assumed (in dollars per share)	50.06	41.89	42.61
Vested (in dollars per share)	42.27	39.63	35.20
Canceled/forfeited/other (in dollars per share)	45.63	42.13	40.45
Unvested, Ending balance (in dollars per share)	$ 46.67	$ 42.93	$ 42.03
Aggregate Fair  Value
Vested	$ 1,979	$ 1,813	$ 2,045