Shareholders' Equity (Additional Information) (Details) - USD ($) $ / shares in Units, shares in Millions |
3 Months Ended | |
|---|---|---|
Oct. 29, 2016 |
Oct. 24, 2015 |
|
| Class of Stock [Line Items] | ||
| Cash dividends paid per common share (in dollars per share) | $ 0.26 | $ 0.21 |
| Payments of dividends | $ 1,308,000,000 | $ 1,068,000,000 |
| Authorized common stock repurchase amount | 112,000,000,000 | |
| Remaining authorized repurchase amount | $ 14,400,000,000 | |
| Shares repurchased for tax withholdings on vesting of restricted stock units (in shares) | 13 | 15 |
| Payments related to tax withholding for share-based compensation | $ 401,000,000 | $ 382,000,000 |