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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, 2019	Dec. 31, 2018	Dec. 31, 2019	Dec. 31, 2018
Earnings Per Share Basic And Diluted [Abstract]
Net income available for common shareholders (A)	$ 11,649	$ 8,420	$ 22,327	$ 17,244
Weighted average outstanding shares of common stock (B)	7,621	7,692	7,628	7,683
Dilutive effect of stock-based awards	70	76	73	84
Common stock and common stock equivalents (C)	7,691	7,768	7,701	7,767
Earnings Per Share
Basic (A/B)	$ 1.53	$ 1.09	$ 2.93	$ 2.24
Diluted (A/C)	$ 1.51	$ 1.08	$ 2.90	$ 2.22

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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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