Changes in Unrecognized Tax Benefits (Detail) - USD ($) $ in Millions	12 Months Ended
Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2016
Income Tax Disclosure [Abstract]
Balance, beginning of year	$ 11,737	$ 10,164	$ 9,599
Decreases related to settlements	(193)	(4)	(201)
Increases for tax positions related to the current year	1,445	1,277	1,086
Increases for tax positions related to prior years	151	397	115
Decreases for tax positions related to prior years	(1,176)	(49)	(317)
Decreases due to lapsed statutes of limitations	(3)	(48)	(118)
Balance, end of year	$ 11,961	$ 11,737	$ 10,164

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Amount of unrecognized tax benefits.

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Amount of decrease in unrecognized tax benefits resulting from tax positions taken in prior period tax returns.

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Amount of decrease in unrecognized tax benefits resulting from settlements with taxing authorities.

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Amount of increase in unrecognized tax benefits resulting from tax positions that have been or will be taken in current period tax return.

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Amount of increase in unrecognized tax benefits resulting from tax positions taken in prior period tax returns.

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