Accumulated Other Comprehensive Income (Loss) - Changes in AOCI (Detail) - USD ($) $ in Millions	12 Months Ended
	May 31, 2020	May 31, 2019	May 31, 2018
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	$ 9,040	$ 9,812	$ 12,407
Other comprehensive income (loss):
Other comprehensive gains (losses) before reclassifications, net of tax	230	410
Reclassifications to net income of previously deferred (gains) losses, net of tax	(517)	(87)
Total other comprehensive income (loss), net of tax	(287)	323	104
Ending balance	8,055	9,040	9,812
Other comprehensive income, before reclassification, tax benefit (expense)	(14)	(3)
Reclassification from AOCI, current period, tax expense (benefit)	2	6
Foreign Currency Translation Adjustment
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	(346)	(173)
Other comprehensive income (loss):
Other comprehensive gains (losses) before reclassifications, net of tax	(149)	(173)
Reclassifications to net income of previously deferred (gains) losses, net of tax	1	0
Total other comprehensive income (loss), net of tax	(148)	(173)
Ending balance	(494)	(346)	(173)
Other comprehensive income, before reclassification, tax benefit (expense)	0	0
Reclassification from AOCI, current period, tax expense (benefit)	0	0
CASH FLOW HEDGES
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	520	17
Other comprehensive income (loss):
Other comprehensive gains (losses) before reclassifications, net of tax	387	573
Reclassifications to net income of previously deferred (gains) losses, net of tax	(517)	(70)
Total other comprehensive income (loss), net of tax	(130)	503
Ending balance	390	520	17
Other comprehensive income, before reclassification, tax benefit (expense)	(15)	(4)
Reclassification from AOCI, current period, tax expense (benefit)	2	6
Net Investment Hedges
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	115	115
Other comprehensive income (loss):
Other comprehensive gains (losses) before reclassifications, net of tax	0	0
Reclassifications to net income of previously deferred (gains) losses, net of tax	0	0
Total other comprehensive income (loss), net of tax	0	0
Ending balance	115	115	115
Other comprehensive income, before reclassification, tax benefit (expense)	0	0
Reclassification from AOCI, current period, tax expense (benefit)	0	0
OTHER
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	(58)	(51)
Other comprehensive income (loss):
Other comprehensive gains (losses) before reclassifications, net of tax	(8)	10
Reclassifications to net income of previously deferred (gains) losses, net of tax	(1)	(17)
Total other comprehensive income (loss), net of tax	(9)	(7)
Ending balance	(67)	(58)	(51)
Other comprehensive income, before reclassification, tax benefit (expense)	1	1
Reclassification from AOCI, current period, tax expense (benefit)	0	0
TOTAL
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	231	(92)	(213)
Other comprehensive income (loss):
Ending balance	$ (56)	$ 231	$ (92)