Basic and Diluted Earnings Per Share (Detail) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2019	Mar. 31, 2018
Earnings Per Share Basic And Diluted [Abstract]
Net income available for common shareholders (A)	$ 8,809	$ 7,424	$ 26,053	$ 7,698
Weighted average outstanding shares of common stock (B)	7,672	7,698	7,679	7,706
Dilutive effect of stock-based awards	72	96	80	92
Common stock and common stock equivalents (C)	7,744	7,794	7,759	7,798
Earnings Per Share
Basic (A/B)	$ 1.15	$ 0.96	$ 3.39	$ 1.00
Diluted (A/C)	$ 1.14	$ 0.95	$ 3.36	$ 0.99