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Stockholders' Equity - Additional information (Details) $ / shares in Units, $ in Millions |  | 6 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Jan. 20, 2022 shares | Jul. 31, 2022 shares | Jul. 31, 2023 USD ($) period $ / shares shares | Jul. 31, 2022 USD ($) shares | Jul. 31, 2021 USD ($) shares | Aug. 31, 2023 $ / shares | Aug. 23, 2023 USD ($) | Dec. 03, 2020 shares | Jul. 31, 2020 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Stock repurchased during period (in shares) | $ |  |  | $ 1,967 | $ 1,854 | $ 1,022 |  |  |  |
Stock repurchased and settled after period (in shares) | $ |  |  | $ 10 |  |  |  |  |  |
Common stock dividends, cash paid (in dollars per share) | $ / shares |  |  | $ 3.12 |  |  |  |  |  |
Common stock dividends | $ |  |  | $ (898) |  |  |  |  |  |
Common stock, shares authorized (in shares) |  | 750,000,000 | 750,000,000 | 750,000,000 |  |  |  |  |
Pool shares reduced for each share granted (in shares) |  |  | 2.3 |  |  |  |  |  |
Pool shares increased for each share forfeited (in shares) |  | 2.3 | 2.3 |  |  |  |  |  |
Shares available for grant (in shares) |  | 26,260,000 | 19,026,000 | 26,260,000 | 16,851,000 |  |  |  | 18,047,000
Stock offering period, months, employee stock purchase plans |  |  | 6 months |  |  |  |  |  |
Stock accrual period, employee stock purchase plans, number of accrual periods | period |  |  | 2 |  |  |  |  |  |
Stock offering period, number of months in accrual period |  |  | 3 months |  |  |  |  |  |
Percentage of lower of the closing price for stock on the first day last day of the offering period |  |  | 85.00% |  |  |  |  |  |
Shares issued during period for Employee Stock Purchase Plans (in shares) |  |  | 399,975 | 326,961 | 405,268 |  |  |  |
Shares available for issuance under Employee Stock Purchase Plan (in shares) |  |  | 2,323,980 |  |  |  |  |  |
Market price of common stock (in dollars per share) | $ / shares |  |  | $ 511.70 |  |  |  |  |  |
Computer software |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Share-based compensation expense | $ |  |  | $ 0 | $ 1 | $ 2 |  |  |  |
Credit Karma |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Number of shares available for future issuance under assumed plan (in shares) |  |  |  |  |  |  |  | 3,366,512 |
Stock Options |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Number of years until options vest |  |  | 7 years |  |  |  |  |  |
Shares available for grant (in shares) |  |  | 19,000,000 |  |  |  |  |  |
Unrecognized compensation cost | $ |  |  | $ 123 |  |  |  |  |  |
Weighted-average vesting period |  |  | 3 years 2 months 12 days |  |  |  |  |  |
Stock Options | Minimum |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Award vesting period |  |  | 3 years |  |  |  |  |  |
Stock Options | Maximum |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Award vesting period |  |  | 4 years |  |  |  |  |  |
Restricted Stock Units (RSUs) |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Percent of total share-based compensation expense |  |  | 85.00% |  |  |  |  |  |
Unrecognized compensation cost | $ |  |  | $ 4,800 |  |  |  |  |  |
Weighted-average vesting period |  |  | 3 years |  |  |  |  |  |
Restricted Stock Units (RSUs) | Minimum |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Award vesting period |  |  | 3 years |  |  |  |  |  |
Restricted Stock Units (RSUs) | Maximum |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Award vesting period |  |  | 4 years |  |  |  |  |  |
Employee Stock |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Common stock, shares authorized (in shares) |  |  | 25,800,000 |  |  |  |  |  |
Restated 2005 Plan |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Common stock, shares authorized (in shares) |  |  | 159,500,000 |  |  |  |  |  |
Restated 2005 Plan | Stock Options |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Pool shares reduced for each share granted (in shares) |  |  | 1 |  |  |  |  |  |
Number of shares added back to plan when grants are forfeited (in shares) |  |  | 1 |  |  |  |  |  |
Credit Karma Plan | Restricted Stock Units (RSUs) |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Pool shares reduced for each share granted (in shares) | 1 |  |  |  |  |  |  |  |
Number of shares added back to plan when grants are forfeited (in shares) | 1 |  |  |  |  |  |  |  |
Subsequent Event |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Stock repurchase program, additional authorized amount (in shares) | $ |  |  |  |  |  |  | $ 2,300 |  |
Dividend per share payable (in dollars per share) | $ / shares |  |  |  |  |  | $ 0.90 |  |  |
Current Program |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Stock repurchase program remaining authorized repurchase amount | $ |  |  | $ 1,500 |  |  |  |  |  |
Common Stock |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Stock repurchases under stock repurchase programs (in shares) |  |  | 4,700,000 | 3,754,000 | 2,422,000 |  |  |  |

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