Basic and Diluted Earnings Per Share (Detail) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Earnings Per Share Basic And Diluted [Abstract]
Net income available for common shareholders (A)	$ 8,824	$ 6,576
Weighted average outstanding shares of common stock (B)	7,673	7,708
Dilutive effect of stock-based awards	93	91
Common stock and common stock equivalents (C)	7,766	7,799
Earnings Per Share
Basic (A/B)	$ 1.15	$ 0.85
Diluted (A/C)	$ 1.14	$ 0.84