Accumulated Other Comprehensive Income (Loss) - Changes in AOCI (Detail) - USD ($) $ in Millions	3 Months Ended
	Aug. 31, 2020	Aug. 31, 2019
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	$ 8,055	$ 9,040
Other comprehensive income (loss):
Other comprehensive gains (losses) before reclassifications, net of tax	(221)	77
Reclassifications to net income of previously deferred (gains) losses, net of tax	(124)	(128)
Total other comprehensive income (loss), net of tax	(345)	(51)
Ending balance	9,224	9,200
Other comprehensive income, before reclassification, tax benefit (expense)	5	0
Reclassification from AOCI, current period, tax expense (benefit)	3	0
Gains (losses) on foreign currency translation adjustment
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	(494)	(346)
Other comprehensive income (loss):
Other comprehensive gains (losses) before reclassifications, net of tax	318	(89)
Reclassifications to net income of previously deferred (gains) losses, net of tax	0	0
Total other comprehensive income (loss), net of tax	318	(89)
Ending balance	(176)	(435)
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	390	520
Other comprehensive income (loss):
Other comprehensive gains (losses) before reclassifications, net of tax	(526)	163
Reclassifications to net income of previously deferred (gains) losses, net of tax	(132)	(127)
Total other comprehensive income (loss), net of tax	(658)	36
Ending balance	(268)	556
Other comprehensive income, before reclassification, tax benefit (expense)	4	0
Reclassification from AOCI, current period, tax expense (benefit)	3	0
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
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	(67)	(58)
Other comprehensive income (loss):
Other comprehensive gains (losses) before reclassifications, net of tax	(13)	3
Reclassifications to net income of previously deferred (gains) losses, net of tax	8	(1)
Total other comprehensive income (loss), net of tax	(5)	2
Ending balance	(72)	(56)
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	(56)	231
Other comprehensive income (loss):
Ending balance	$ (401)	$ 180