Basic and Diluted Earnings Per Share (Detail) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Mar. 31, 2025	Mar. 31, 2024
Earning Per Share Basic And Diluted [Abstract]
Net income available for common shareholders (A)	$ 25,824	$ 21,939	$ 74,599	$ 66,100
Weighted average outstanding shares of common stock (B)	7,434	7,431	7,434	7,431
Dilutive effect of stock-based awards	27	41	32	36
Common stock and common stock equivalents (C)	7,461	7,472	7,466	7,467
Earnings Per Share
Basic (A/B)	$ 3.47	$ 2.95	$ 10.03	$ 8.9
Diluted (A/C)	$ 3.46	$ 2.94	$ 9.99	$ 8.85