v3.19.1

Employee Benefit Plans (Additional Information) (Details) $ / shares in Units, $ in Billions |  | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | ---
Nov. 12, 2009 shares | Apr. 27, 2019 USD ($) stock_incentive_plan shares | Apr. 28, 2018 shares | Apr. 27, 2019 USD ($) stock_incentive_plan shares | Apr. 28, 2018 shares | Oct. 26, 2018 $ / shares | Jul. 28, 2018 $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Number of stock incentive plans (stock incentive plan) | stock_incentive_plan |  | 1 |  | 1 |  |  |
Total compensation cost related to unvested share-based awards | $ |  | $ 2.9 |  | $ 2.9 |  |  |
Expected period of recognition of compensation cost |  |  |  | 2 years 9 months 6 days |  |  |
Closing stock price (in dollars per share) | $ / shares |  |  |  |  |  | $ 55.88 |
In-the-money exercisable stock option shares (in shares) |  | 2,000,000 |  | 2,000,000 |  |  |
Number Exercisable (in shares) |  |  |  |  |  |  | 4,000,000
Weighted- average exercise price per share (in dollars per share) | $ / shares |  |  |  |  |  |  | $ 6.84
Employee Stock Purchase Plan |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Shares reserved for issuance (in shares) |  | 721,400,000.0 |  | 721,400,000.0 |  |  |
Expiration date for stock options and stock appreciation rights |  |  |  | 24 months |  |  |
Shares eligible for employees purchase, percentage of discount |  |  |  | 15.00% |  |  |
Shares issued under employee purchase plan, shares (in shares) |  | 0 | 0 | 9,000,000 | 12,000,000 |  |
Shares available for issuance (in shares) |  | 169,000,000 |  | 169,000,000 |  |  |
2005 Plan |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Shares reserved for issuance (in shares) |  | 694,000,000 |  | 694,000,000 |  |  |
Exercise price as a percentage of market value for Options | 100.00% |  |  |  |  |  |
Award requisite service period |  |  |  | 3 years |  |  |
PRSU allocation between Financial operating goals and TSR |  |  |  | 50.00% |  |  |
2005 Plan | Stock awards subsequent to November 12, 2009 |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Reduction in shares available for issuance pursuant to November 12, 2009 amendment (in shares) | 1.5 | 1.5 |  | 1.5 |  |  |
2005 Plan | Stock awards subsequent to November 12, 2009 | Maximum |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Expiration date for stock options and stock appreciation rights | 10 years |  |  |  |  |  |
2005 Plan | Employee Stock Option |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Award vesting period |  |  |  | 1 year |  |  |
2005 Plan | Employee Stock Option | Maximum |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Share-based compensation award vesting rights, percentage |  |  |  | 25.00% |  |  |
Award requisite service period |  |  |  | 48 months |  |  |
2005 Plan | Employee Stock Option | Minimum |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Share-based compensation award vesting rights, percentage |  |  |  | 20.00% |  |  |
Award requisite service period |  |  |  | 36 months |  |  |
2005 Plan | Performance base and Market base RSU |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Award requisite service period |  |  |  | 3 years |  |  |
2005 Plan | Performance based RSU based on Financial or nonFinancial operating goal | Maximum |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Award requisite service period |  |  |  | 3 years |  |  |
2005 Plan | Performance based RSU based on Financial or nonFinancial operating goal | Minimum |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Award requisite service period |  |  |  | 6 months |  |  |
2005 Plan | PRSU based on financial performance metrics | Maximum |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Share-based compensation award vesting rights, percentage |  |  |  | 150.00% |  |  |
2005 Plan | PRSU based on financial performance metrics | Minimum |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Share-based compensation award vesting rights, percentage |  |  |  | 0.00% |  |  |
2005 Plan | PRSU based on TSR | Maximum |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Share-based compensation award vesting rights, percentage |  |  |  | 150.00% |  |  |
2005 Plan | PRSU based on TSR | Minimum |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Share-based compensation award vesting rights, percentage |  |  |  | 0.00% |  |  |
2005 Plan | PRSU based on nonfinancial operating goals | Maximum |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Share-based compensation award vesting rights, percentage |  |  |  | 100.00% |  |  |
2005 Plan | PRSU based on nonfinancial operating goals | Minimum |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Share-based compensation award vesting rights, percentage |  |  |  | 0.00% |  |  |
2005 Plan | Time Based Stock Grants And Restricted Stock Units (RSUs) |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Award vesting period |  |  |  | 4 years |  |  |

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