Basic and Diluted Earnings Per Share (Detail) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2019
Earnings Per Share Basic And Diluted [Abstract]
Net income available for common shareholders (A)	$ 61,271	$ 44,281	$ 39,240
Weighted average outstanding shares of common stock (B)	7,547	7,610	7,673
Dilutive effect of stock-based awards	61	73	80
Common stock and common stock equivalents (C)	7,608	7,683	7,753
Earnings Per Share
Basic (A/B)	$ 8.12	$ 5.82	$ 5.11
Diluted (A/C)	$ 8.05	$ 5.76	$ 5.06