Income Taxes - Reconciliation of Changes in Gross Balance of Unrecognized Tax Benefits (Detail) - USD ($) $ in Millions	12 Months Ended
May 31, 2019	May 31, 2018	May 31, 2017
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Unrecognized tax benefits, as of the beginning of the period	$ 698	$ 461	$ 506
Gross increases related to prior period tax positions	85	19	31
Gross decreases related to prior period tax positions	(32)	(12)	(163)
Gross increases related to current period tax positions	81	249	115
Settlements	0	0	(12)
Lapse of statute of limitations	(35)	(20)	(21)
Changes due to currency translation	11	1	5
UNRECOGNIZED TAX BENEFITS, AS OF THE END OF THE PERIOD	$ 808	$ 698	$ 461

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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- Definition

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 foreign currency translation.

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Amount of decrease in unrecognized tax benefits resulting from lapses of applicable statutes of limitations.

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