Accumulated Other Comprehensive Income - Changes in AOCI (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Nov. 30, 2016	Nov. 30, 2015	Nov. 30, 2016	Nov. 30, 2015
AOCI Including Portion Attributable to Noncontrolling, Net of Tax [Roll Forward]
Beginning balance	$ 85	$ 833	$ 318	$ 1,246
Other comprehensive gains (losses) before reclassifications, net of tax	455	407	411	184
Reclassifications to net income of previously deferred (gains) losses, net of tax	(141)	(133)	(330)	(323)
Total other comprehensive income (loss), net of tax	314	274	81	(139)
Ending balance	399	1,107	399	1,107
Other comprehensive income, before reclassification, tax benefit (expense)	(24)	16	23	14
Reclassification from accumulated other comprehensive income, tax (benefit) expense	(2)	0	(3)	1
Foreign Currency Translation Adjustment
AOCI Including Portion Attributable to Noncontrolling, Net of Tax [Roll Forward]
Beginning balance	(204)	(112)	(207)	(31)
Other comprehensive gains (losses) before reclassifications, net of tax	(14)	(29)	(11)	(110)
Reclassifications to net income of previously deferred (gains) losses, net of tax	0	0	0	0
Total other comprehensive income (loss), net of tax	(14)	(29)	(11)	(110)
Ending balance	(218)	(141)	(218)	(141)
Other comprehensive income, before reclassification, tax benefit (expense)	0	0	0	0
Reclassification from accumulated other comprehensive income, tax (benefit) expense	0	0	0	0
Cash Flow Hedges
AOCI Including Portion Attributable to Noncontrolling, Net of Tax [Roll Forward]
Beginning balance	223	891	463	1,220
Other comprehensive gains (losses) before reclassifications, net of tax	464	425	404	283
Reclassifications to net income of previously deferred (gains) losses, net of tax	(141)	(135)	(321)	(322)
Total other comprehensive income (loss), net of tax	323	290	83	(39)
Ending balance	546	1,181	546	1,181
Other comprehensive income, before reclassification, tax benefit (expense)	(24)	18	22	16
Reclassification from accumulated other comprehensive income, tax (benefit) expense	(2)	0	(2)	1
Net Investment Hedges
AOCI Including Portion Attributable to Noncontrolling, Net of Tax [Roll Forward]
Beginning balance	115	115	115	115
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 accumulated other comprehensive income, tax (benefit) expense	0	0	0	0
Other
AOCI Including Portion Attributable to Noncontrolling, Net of Tax [Roll Forward]
Beginning balance	(49)	(61)	(53)	(58)
Other comprehensive gains (losses) before reclassifications, net of tax	5	11	18	11
Reclassifications to net income of previously deferred (gains) losses, net of tax	0	2	(9)	(1)
Total other comprehensive income (loss), net of tax	5	13	9	10
Ending balance	(44)	(48)	(44)	(48)
Other comprehensive income, before reclassification, tax benefit (expense)	0	(2)	1	(2)
Reclassification from accumulated other comprehensive income, tax (benefit) expense	$ 0	$ 0	$ (1)	$ 0