Basic and Diluted Earnings Per Share (Detail) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended
	Sep. 30, 2025	Sep. 30, 2024
Earning Per Share Basic And Diluted [Abstract]
Net income available for common shareholders (A)	$ 27,747	$ 24,667
Weighted average outstanding shares of common stock (B)	7,433	7,433
Dilutive effect of stock-based awards	33	37
Common stock and common stock equivalents (C)	7,466	7,470
Earnings Per Share
Basic (A/B)	$ 3.73	$ 3.32
Diluted (A/C)	$ 3.72	$ 3.30