Employee Benefit Plans (Summary of Share-Based Awards available for Grant) (Details) - shares shares in Millions |
3 Months Ended | 12 Months Ended |
|---|---|---|
Oct. 29, 2016 |
Jul. 30, 2016 |
|
| Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward] | ||
| Balance, beginning of period (in shares) | 242 | 276 |
| Restricted stock, stock units, and other share-based awards granted (in shares) | (16) | (96) |
| Share-based awards canceled/forfeited/expired (in shares) | 66 | 30 |
| Shares withheld for taxes and not issued (in shares) | 19 | 30 |
| Other (in shares) | 2 | |
| Balance, end of period (in shares) | 311 | 242 |