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Share Repurchases (Detail) - USD ($) shares in Millions, $ in Millions	3 Months Ended				6 Months Ended
	Dec. 31, 2021	Sep. 30, 2021	Dec. 31, 2020	Sep. 30, 2020	Dec. 31, 2021	Dec. 31, 2020
Share Repurchase Program 2019
Share Repurchases [Line Items]
Shares of common stock repurchased		21	27	25		52
Value of common stock repurchased		$ 6,200	$ 5,750	$ 5,270		$ 11,020
Share Repurchase Programs 2019 and 2021
Share Repurchases [Line Items]
Shares of common stock repurchased	20				41
Value of common stock repurchased	$ 6,233				$ 12,433

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- Definition

Share Repurchases [Line Items]

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Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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Equity impact of the value of stock that has been repurchased during the period and has not been retired and is not held in treasury. Some state laws may mandate the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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-Name Accounting Standards Codification
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-SubTopic 10
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