Basic and Diluted Earnings Per Share (Detail) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2018	Mar. 31, 2017
Earnings Per Share Basic And Diluted [Abstract]
Net income available for common shareholders (A)	$ 7,424	$ 5,486	$ 7,698	$ 17,420
Weighted average outstanding shares of common stock (B)	7,698	7,725	7,706	7,756
Dilutive effect of stock-based awards	96	88	92	84
Common stock and common stock equivalents (C)	7,794	7,813	7,798	7,840
Earnings Per Share
Basic (A/B)	$ 0.96	$ 0.71	$ 1.00	$ 2.25
Diluted (A/C)	$ 0.95	$ 0.70	$ 0.99	$ 2.22