Accumulated Other Comprehensive Income - Changes in AOCI (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Feb. 28, 2017	Feb. 29, 2016	Feb. 28, 2017	Feb. 29, 2016
AOCI Including Portion Attributable to Noncontrolling, Net of Tax [Roll Forward]
Beginning balance			$ 12,258
Other comprehensive gains (losses) before reclassifications, net of tax	$ 15	$ (261)	426	$ (77)
Reclassifications to net income of previously deferred (gains) losses, net of tax	(185)	(201)	(515)	(524)
Total other comprehensive income (loss), net of tax	(170)	(462)	(89)	(601)
Ending balance	12,722		12,722
Other comprehensive income, before reclassification, tax benefit (expense)	0	23	23	37
Reclassification from accumulated other comprehensive income, tax (benefit) expense	1	3	(2)	4
Foreign Currency Translation Adjustment
AOCI Including Portion Attributable to Noncontrolling, Net of Tax [Roll Forward]
Beginning balance	(218)	(141)	(207)	(31)
Other comprehensive gains (losses) before reclassifications, net of tax	13	(113)	2	(223)
Reclassifications to net income of previously deferred (gains) losses, net of tax	(1)	2	(1)	2
Total other comprehensive income (loss), net of tax	12	(111)	1	(221)
Ending balance	(206)	(252)	(206)	(252)
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	546	1,181	463	1,220
Other comprehensive gains (losses) before reclassifications, net of tax	2	(151)	406	132
Reclassifications to net income of previously deferred (gains) losses, net of tax	(177)	(199)	(498)	(521)
Total other comprehensive income (loss), net of tax	(175)	(350)	(92)	(389)
Ending balance	371	831	371	831
Other comprehensive income, before reclassification, tax benefit (expense)	1	24	23	40
Reclassification from accumulated other comprehensive income, tax (benefit) expense	(1)	3	(3)	4
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	(44)	(48)	(53)	(58)
Other comprehensive gains (losses) before reclassifications, net of tax	0	3	18	14
Reclassifications to net income of previously deferred (gains) losses, net of tax	(7)	(4)	(16)	(5)
Total other comprehensive income (loss), net of tax	(7)	(1)	2	9
Ending balance	(51)	(49)	(51)	(49)
Other comprehensive income, before reclassification, tax benefit (expense)	(1)	(1)	0	(3)
Reclassification from accumulated other comprehensive income, tax (benefit) expense	2	0	1	0
Total
AOCI Including Portion Attributable to Noncontrolling, Net of Tax [Roll Forward]
Beginning balance	399	1,107	318	1,246
Ending balance	$ 229	$ 645	$ 229	$ 645