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Basic and Diluted Earnings Per Share (Detail) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2021	Mar. 31, 2020
Earnings Per Share Basic And Diluted [Abstract]
Net income available for common shareholders (A)	$ 15,457	$ 10,752	$ 44,813	$ 33,079
Weighted average outstanding shares of common stock (B)	7,539	7,602	7,554	7,619
Dilutive effect of stock-based awards	58	73	63	74
Common stock and common stock equivalents (C)	7,597	7,675	7,617	7,693
Earnings Per Share
Basic (A/B)	$ 2.05	$ 1.41	$ 5.93	$ 4.34
Diluted (A/C)	$ 2.03	$ 1.40	$ 5.88	$ 4.30

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