Employee Benefit Plans - Summary of Share-Based Awards Available for Grant (Details) - shares shares in Millions	12 Months Ended
	Jul. 27, 2019	Jul. 28, 2018	Jul. 29, 2017
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward]
Balance at beginning of fiscal year (in shares)	245	272	242
Restricted stock, stock units, and other share-based awards granted (in shares)	(67)	(70)	(76)
Share-based awards canceled/forfeited/expired (in shares)	18	18	78
Shares withheld for taxes and not issued (in shares)	23	25	28
Other (in shares)	1	0	0
Balance at end of fiscal year (in shares)	220	245	272