Basic and Diluted Earnings Per Share (Detail) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2024	Dec. 31, 2023
Earning Per Share Basic And Diluted [Abstract]
Net income available for common shareholders (A)	$ 24,108	$ 21,870	$ 48,775	$ 44,161
Weighted average outstanding shares of common stock (B)	7,435	7,432	7,434	7,431
Dilutive effect of stock-based awards	33	36	35	34
Common stock and common stock equivalents (C)	7,468	7,468	7,469	7,465
Earnings Per Share
Basic (A/B)	$ 3.24	$ 2.94	$ 6.56	$ 5.94
Diluted (A/C)	$ 3.23	$ 2.93	$ 6.53	$ 5.92