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Basic and Diluted Earnings Per Share (Detail) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2020	Dec. 31, 2019
Earnings Per Share Basic And Diluted [Abstract]
Net income available for common shareholders (A)	$ 15,463	$ 11,649	$ 29,356	$ 22,327
Weighted average outstanding shares of common stock (B)	7,555	7,621	7,561	7,628
Dilutive effect of stock-based awards	61	70	66	73
Common stock and common stock equivalents (C)	7,616	7,691	7,627	7,701
Earnings Per Share
Basic (A/B)	$ 2.05	$ 1.53	$ 3.88	$ 2.93
Diluted (A/C)	$ 2.03	$ 1.51	$ 3.85	$ 2.90

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