Basic and Diluted Earnings Per Share (Detail) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Mar. 31, 2024	Mar. 31, 2023
Earning Per Share Basic And Diluted [Abstract]
Net income available for common shareholders (A)	$ 21,939	$ 18,299	$ 66,100	$ 52,280
Weighted average outstanding shares of common stock (B)	7,431	7,441	7,431	7,450
Dilutive effect of stock-based awards	41	23	36	24
Common stock and common stock equivalents (C)	7,472	7,464	7,467	7,474
Earnings Per Share
Basic (A/B)	$ 2.95	$ 2.46	$ 8.9	$ 7.02
Diluted (A/C)	$ 2.94	$ 2.45	$ 8.85	$ 6.99