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Basic and Diluted Earnings Per Share (Detail) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Earnings Per Share Basic And Diluted [Abstract]
Net income available for common shareholders (A)	$ 13,893	$ 10,678
Weighted average outstanding shares of common stock (B)	7,566	7,634
Dilutive effect of stock-based awards	71	76
Common stock and common stock equivalents (C)	7,637	7,710
Earnings Per Share
Basic (A/B)	$ 1.84	$ 1.40
Diluted (A/C)	$ 1.82	$ 1.38

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