Accumulated Other Comprehensive Income - Changes in AOCI (Detail) - USD ($) $ in Millions	3 Months Ended
	Aug. 31, 2018	Aug. 31, 2017
AOCI Including Portion Attributable to Noncontrolling, Net of Tax [Roll Forward]
Beginning balance	$ 9,812
Other comprehensive income (loss):
Other comprehensive (losses) gains before reclassifications, net of tax	18	$ (343)
Reclassifications to net income of previously deferred losses (gains), net of tax	44	(30)
Total other comprehensive income (loss), net of tax	62	(373)
Ending balance	8,992
Other comprehensive income, before reclassification, tax benefit (expense)	(1)	(16)
Reclassification from AOCI, Current Period, Tax	1	(1)
Foreign Currency Translation Adjustment
AOCI Including Portion Attributable to Noncontrolling, Net of Tax [Roll Forward]
Beginning balance	(173)	(191)
Other comprehensive income (loss):
Other comprehensive (losses) gains before reclassifications, net of tax	(128)	22
Reclassifications to net income of previously deferred losses (gains), net of tax	0	0
Total other comprehensive income (loss), net of tax	(128)	22
Ending balance	(301)	(169)
Other comprehensive income, before reclassification, tax benefit (expense)	0	(19)
Reclassification from AOCI, Current Period, Tax	0	0
Cash Flow Hedges
AOCI Including Portion Attributable to Noncontrolling, Net of Tax [Roll Forward]
Beginning balance	17	(52)
Other comprehensive income (loss):
Other comprehensive (losses) gains before reclassifications, net of tax	142	(347)
Reclassifications to net income of previously deferred losses (gains), net of tax	51	(48)
Total other comprehensive income (loss), net of tax	193	(395)
Ending balance	210	(447)
Other comprehensive income, before reclassification, tax benefit (expense)	(1)	3
Reclassification from AOCI, Current Period, Tax	1	(1)
Net Investment Hedges
AOCI Including Portion Attributable to Noncontrolling, Net of Tax [Roll Forward]
Beginning balance	115	115
Other comprehensive income (loss):
Other comprehensive (losses) gains before reclassifications, net of tax	0	0
Reclassifications to net income of previously deferred losses (gains), 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	0	0
Other
AOCI Including Portion Attributable to Noncontrolling, Net of Tax [Roll Forward]
Beginning balance	(51)	(85)
Other comprehensive income (loss):
Other comprehensive (losses) gains before reclassifications, net of tax	4	(18)
Reclassifications to net income of previously deferred losses (gains), net of tax	(7)	18
Total other comprehensive income (loss), net of tax	(3)	0
Ending balance	(54)	(85)
Other comprehensive income, before reclassification, tax benefit (expense)	0	0
Reclassification from AOCI, Current Period, Tax	0	0
Total
AOCI Including Portion Attributable to Noncontrolling, Net of Tax [Roll Forward]
Beginning balance	(92)	(213)
Other comprehensive income (loss):
Ending balance	$ (30)	$ (586)