Accumulated Other Comprehensive Income - Changes in AOCI (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Feb. 28, 2019	Feb. 28, 2018	Feb. 28, 2019	Feb. 28, 2018
AOCI Including Portion Attributable to Noncontrolling, Net of Tax [Roll Forward]
Beginning balance	$ 8,729	$ 11,758	$ 9,812	$ 12,407
Other comprehensive income (loss):
Other comprehensive (losses) gains before reclassifications, net of tax	33	(120)	305	(493)
Reclassifications to net income of previously deferred losses (gains), net of tax	(45)	66	(16)	65
Total other comprehensive income (loss), net of tax	(12)	(54)	289	(428)
Total other comprehensive income (loss)		17		17
Ending balance	8,961	9,782	8,961	9,782
Other comprehensive income, before reclassification, tax benefit (expense)	(1)	2	(5)	(22)
Reclassification from AOCI, Current Period, Tax	3	2	5	(1)
Foreign Currency Translation Adjustment
AOCI Including Portion Attributable to Noncontrolling, Net of Tax [Roll Forward]
Beginning balance	(303)	(177)	(173)	(191)
Other comprehensive income (loss):
Other comprehensive (losses) gains before reclassifications, net of tax	79	51	(51)	65
Reclassifications to net income of previously deferred losses (gains), net of tax	0	0	0	0
Total other comprehensive income (loss), net of tax	79	51	(51)	65
Total other comprehensive income (loss)		24		24
Ending balance	(224)	(102)	(224)	(102)
Other comprehensive income, before reclassification, tax benefit (expense)	0	0	0	(23)
Reclassification from AOCI, Current Period, Tax	0	0	0	0
Cash Flow Hedges
AOCI Including Portion Attributable to Noncontrolling, Net of Tax [Roll Forward]
Beginning balance	451	(439)	17	(52)
Other comprehensive income (loss):
Other comprehensive (losses) gains before reclassifications, net of tax	(43)	(156)	351	(523)
Reclassifications to net income of previously deferred losses (gains), net of tax	(48)	49	(8)	29
Total other comprehensive income (loss), net of tax	(91)	(107)	343	(494)
Total other comprehensive income (loss)		(7)		(7)
Ending balance	360	(553)	360	(553)
Other comprehensive income, before reclassification, tax benefit (expense)	(1)	2	(5)	1
Reclassification from AOCI, Current Period, Tax	3	1	5	(2)
Net Investment Hedges
AOCI Including Portion Attributable to Noncontrolling, Net of Tax [Roll Forward]
Beginning balance	115	115	115	115
Other comprehensive income (loss):
Other comprehensive (losses) gains before reclassifications, net of tax	0	0	0	0
Reclassifications to net income of previously deferred losses (gains), net of tax	0	0	0	0
Total other comprehensive income (loss), net of tax	0	0	0	0
Total other comprehensive income (loss)		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	0	0	0	0
Other
AOCI Including Portion Attributable to Noncontrolling, Net of Tax [Roll Forward]
Beginning balance	(54)	(86)	(51)	(85)
Other comprehensive income (loss):
Other comprehensive (losses) gains before reclassifications, net of tax	(3)	(15)	5	(35)
Reclassifications to net income of previously deferred losses (gains), net of tax	3	17	(8)	36
Total other comprehensive income (loss), net of tax	0	2	(3)	1
Total other comprehensive income (loss)		0		0
Ending balance	(54)	(84)	(54)	(84)
Other comprehensive income, before reclassification, tax benefit (expense)	0	0	0	0
Reclassification from AOCI, Current Period, Tax	0	1	0	1
Total
AOCI Including Portion Attributable to Noncontrolling, Net of Tax [Roll Forward]
Beginning balance	209	(587)	(92)	(213)
Other comprehensive income (loss):
Ending balance	$ 197	$ (624)	$ 197	$ (624)