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Stockholders' Equity - Additional Information (Detail) - USD ($) | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Sep. 18, 2019 | Sep. 20, 2016
Share Repurchases [Line Items] |  |  |  |  |  |
Amount of shares repurchased to settle employee tax withholding related to vesting of stock awards | $ 785,000,000 | $ 551,000,000 | $ 2,300,000,000 | $ 1,500,000,000 |  |
Share Repurchase Program 2016 |  |  |  |  |  |
Share Repurchases [Line Items] |  |  |  |  |  |
Amount available for repurchase under the share repurchase program approved by the company's Board of Directors |  |  |  |  |  | $ 40,000,000,000.0
Share Repurchase Program 2019 |  |  |  |  |  |
Share Repurchases [Line Items] |  |  |  |  |  |
Amount available for repurchase under the share repurchase program approved by the company's Board of Directors |  |  |  |  | $ 40,000,000,000.0 |
Unused amount of share repurchase program | $ 20,700,000,000 |  | $ 20,700,000,000 |  |  |

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- Definition Amount of cash outflow to satisfy grantee's tax withholding obligation for award under share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3291-108585 + Details
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