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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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Share Repurchases [Line Items]

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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

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