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Share Repurchases (Detail) - USD ($) shares in Millions, $ in Millions	3 Months Ended						9 Months Ended
	Mar. 31, 2021	Dec. 31, 2020	Sep. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Mar. 31, 2021	Mar. 31, 2020
Share Repurchase Program 2019
Share Repurchases [Line Items]
Shares of common stock repurchased	25	27	25				77
Value of common stock repurchased	$ 5,750	$ 5,750	$ 5,270				$ 16,770
Share Repurchase Program 2016
Share Repurchases [Line Items]
Shares of common stock repurchased					32	29
Value of common stock repurchased					$ 4,600	$ 4,000
Share Repurchase Programs 2016 and 2019
Share Repurchases [Line Items]
Shares of common stock repurchased				37				98
Value of common stock repurchased				$ 6,000				$ 14,600

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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.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
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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.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(28))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

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Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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-Subparagraph (SX 210.3-04)
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