Income Taxes - Reconciliation of Changes in Gross Balance of Unrecognized Tax Benefits (Detail) - USD ($) $ in Millions	12 Months Ended
May 31, 2020	May 31, 2019	May 31, 2018
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Unrecognized tax benefits, as of the beginning of the period	$ 808	$ 698	$ 461
Gross increases related to prior period tax positions	181	85	19
Gross decreases related to prior period tax positions	(171)	(32)	(12)
Gross increases related to current period tax positions	50	81	249
Settlements	(58)	0	0
Lapse of statute of limitations	(28)	(35)	(20)
Decrease due to currency translation	(11)
Increase due to currency translation		11	1
UNRECOGNIZED TAX BENEFITS, AS OF THE END OF THE PERIOD	$ 771	$ 808	$ 698

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

No definition available.

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Amount of unrecognized tax benefits.

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Amount of decrease in unrecognized tax benefits resulting from foreign currency translation.

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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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