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Share Repurchases (Detail) - USD ($) shares in Millions, $ in Millions	3 Months Ended						9 Months Ended
	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Mar. 31, 2020	Mar. 31, 2019
Share Repurchase Program 2016
Share Repurchases [Line Items]
Shares of common stock repurchased		32	29	36	57	24		117
Value of common stock repurchased		$ 4,600	$ 4,000	$ 3,899	$ 6,100	$ 2,600		$ 12,599
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

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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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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
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