Accumulated Other Comprehensive Income (Loss) - Changes in AOCI (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Nov. 30, 2019	Nov. 30, 2018	Nov. 30, 2019	Nov. 30, 2018
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	$ 9,200	$ 8,992	$ 9,040	$ 9,812
Other comprehensive income (loss):
Other comprehensive gains (losses) before reclassifications, net of tax	0	254	77	272
Reclassifications to net income of previously deferred (gains) losses, net of tax	(128)	(15)	(256)	29
Total other comprehensive income (loss), net of tax	(128)	239	(179)	301
Ending balance	9,351	8,729	9,351	8,729
Other comprehensive income, before reclassification, tax benefit (expense)	(7)	(3)	(7)	(4)
Reclassification from AOCI, current period, tax expense (benefit)	1	1	1	2
Foreign Currency Translation Adjustment
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	(435)	(301)	(346)	(173)
Other comprehensive income (loss):
Other comprehensive gains (losses) before reclassifications, net of tax	28	(2)	(61)	(130)
Reclassifications to net income of previously deferred (gains) losses, net of tax	0	0	0	0
Total other comprehensive income (loss), net of tax	28	(2)	(61)	(130)
Ending balance	(407)	(303)	(407)	(303)
Other comprehensive income, before reclassification, tax benefit (expense)	0	0	0	0
Reclassification from AOCI, current period, tax expense (benefit)	0	0	0	0
CASH FLOW HEDGES
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	556	210	520	17
Other comprehensive income (loss):
Other comprehensive gains (losses) before reclassifications, net of tax	(26)	252	137	394
Reclassifications to net income of previously deferred (gains) losses, net of tax	(129)	(11)	(256)	40
Total other comprehensive income (loss), net of tax	(155)	241	(119)	434
Ending balance	401	451	401	451
Other comprehensive income, before reclassification, tax benefit (expense)	(7)	(3)	(7)	(4)
Reclassification from AOCI, current period, tax expense (benefit)	1	1	1	2
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	0
Reclassifications to net income of previously deferred (gains) losses, net of tax	0	0	0	0
Total other comprehensive income (loss), net of tax	0	0	0	0
Ending balance	115	115	115	115
Other comprehensive income, before reclassification, tax benefit (expense)	0	0	0	0
Reclassification from AOCI, current period, tax expense (benefit)	0	0	0	0
OTHER
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	(56)	(54)	(58)	(51)
Other comprehensive income (loss):
Other comprehensive gains (losses) before reclassifications, net of tax	(2)	4	1	8
Reclassifications to net income of previously deferred (gains) losses, net of tax	1	(4)	0	(11)
Total other comprehensive income (loss), net of tax	(1)	0	1	(3)
Ending balance	(57)	(54)	(57)	(54)
Other comprehensive income, before reclassification, tax benefit (expense)	0	0	0	0
Reclassification from AOCI, current period, tax expense (benefit)	0	0	0	0
TOTAL
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	180	(30)	231	(92)
Other comprehensive income (loss):
Ending balance	$ 52	$ 209	$ 52	$ 209