Accumulated Other Comprehensive Income (Loss) - Changes in AOCI (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Nov. 30, 2020	Nov. 30, 2019	Nov. 30, 2020	Nov. 30, 2019
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	$ 9,224	$ 9,200	$ 8,055	$ 9,040
Other comprehensive income (loss):
Other comprehensive gains (losses) before reclassifications, net of tax	13	0	(208)	77
Reclassifications to net income of previously deferred (gains) losses, net of tax	(41)	(128)	(165)	(256)
Total other comprehensive income (loss), net of tax	(28)	(128)	(373)	(179)
Ending balance	10,640	9,351	10,640	9,351
Other comprehensive income, before reclassification, tax benefit (expense)	(4)		1	(7)
Reclassification from AOCI, current period, tax expense (benefit)	4		7	1
Gains (losses) on foreign currency translation adjustment
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	(176)	(435)	(494)	(346)
Other comprehensive income (loss):
Other comprehensive gains (losses) before reclassifications, net of tax	79	28	397	(61)
Reclassifications to net income of previously deferred (gains) losses, net of tax	(1)	0	(1)	0
Total other comprehensive income (loss), net of tax	78	28	396	(61)
Ending balance	(98)	(407)	(98)	(407)
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	(268)	556	390	520
Other comprehensive income (loss):
Other comprehensive gains (losses) before reclassifications, net of tax	(64)	(26)	(590)	137
Reclassifications to net income of previously deferred (gains) losses, net of tax	(39)	(129)	(171)	(256)
Total other comprehensive income (loss), net of tax	(103)	(155)	(761)	(119)
Ending balance	(371)	401	(371)	401
Other comprehensive income, before reclassification, tax benefit (expense)	(4)			(7)
Reclassification from AOCI, current period, tax expense (benefit)	4		7	1
Net Investment Hedges
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	115	115	115	115
Other comprehensive income (loss):
Other comprehensive gains (losses) before reclassifications, net of tax	0	0		0
Reclassifications to net income of previously deferred (gains) losses, net of tax	0	0		0
Total other comprehensive income (loss), net of tax	0	0		0
Ending balance	115	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	(72)	(56)	(67)	(58)
Other comprehensive income (loss):
Other comprehensive gains (losses) before reclassifications, net of tax	(2)	(2)	(15)	1
Reclassifications to net income of previously deferred (gains) losses, net of tax	(1)	1	7	0
Total other comprehensive income (loss), net of tax	(3)	(1)	(8)	1
Ending balance	(75)	(57)	(75)	(57)
Other comprehensive income, before reclassification, tax benefit (expense)			1	0
Reclassification from AOCI, current period, tax expense (benefit)	0			0
TOTAL
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	(401)	180	(56)	231
Other comprehensive income (loss):
Ending balance	$ (429)	$ 52	$ (429)	$ 52